UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

(Mark One)

☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2025

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

From the transition period from to

Commission file number: 000-50633

CYTOKINETICS, INCORPORATED

(Exact name of registrant as specified in its charter)

(650) 624-3000

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

None

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☑ No ☐

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes ☐ No ☑

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No ☐

Indicate by check mark whether the Registrant has submitted electronically Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑ No ☐

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. 

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C.7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☑

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the Registrant included in the filing reflect the correction of an error to previously issued financial statements. ☐

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the Registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b). ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☑

The approximate aggregate market value of voting and non-voting common stock held by non-affiliates of the Registrant was $2.5 billion as of June 30, 2025.(A)

(A) Excludes 43.8 million shares of common stock held by directors and executive officers, and any stockholders known to us whose ownership exceeded ten percent of our common stock outstanding as of June 30, 2025. Exclusion of shares held by any person should not be construed to indicate that such person possesses the power, directly or indirectly, to direct or cause the direction of the management or policies of the registrant, or that such person is controlled by or under common control with the registrant.

As of February 23, 2026, the number of shares outstanding of the Registrant’s common stock, par value $0.001 per share, was 123,162,807 shares.

DOCUMENTS INCORPORATED BY REFERENCE

CYTOKINETICS, INCORPORATED

FORM 10-K

YEAR ENDED DECEMBER 31, 2025

INDEX

Glossary of Terms

Unless the context requires otherwise, references to “Cytokinetics,” “the Company,” “we,” “us” or “our” in this Form 10-K refer to Cytokinetics, Incorporated and its subsidiaries. References to “Notes” in this Form 10-K are to the Notes to the Consolidated Financial Statements in this Form 10-K. We also have used other specific terms in this Form 10-K, most of which are explained or defined below:

This Form 10-K includes discussion of certain clinical studies relating to various in-line products and/or product candidates. These studies typically are part of a larger body of clinical data relating to such products or product candidates, and the discussion herein should be considered in the context of the larger body of data. In addition, clinical trial data are subject to differing interpretations, and, even when we view data as sufficient to support the safety and/or effectiveness of a product candidate or a new indication for an in-line product, regulatory authorities may not share our views and may require additional data or may deny approval altogether.

CYTOKINETICS and our C-shaped logo are registered trademarks of Cytokinetics in the U.S. and certain other countries. Other service marks, trademarks and trade names referred to in this report are the property of their respective owners.

The information contained on our website, our Facebook, Instagram, YouTube and LinkedIn pages or our X (formerly Twitter) accounts, or any third-party website, is not incorporated by reference into this Form 10-K.

FORWARD LOOKING STATEMENTS

PRIVATE SECURITIES LITIGATION REFORM ACT OF 1995

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. All statements other than statements of historical fact, including statements concerning our plans, objectives, goals, strategies, future events, future revenues or performance, financing needs, expectations, plans or intentions relating to clinical development, product candidates, the regulatory approval process, our commercialization efforts for MYQORZO, products and markets, and business trends and other information referred to under the “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” are forward-looking statements. In some cases, you can identify forward-looking statements by terms such as “anticipate,” “assume,” “believe,” “commitment,” “could,” “estimate,” “expect,” “forecast,” “intend,” “may,” “plan,” “potential,” “predict,” “project,” “should,” “target,” “will,” “would,” “seek” and similar expressions intended to identify forward-looking statements. We have made these statements in reliance on the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are subject to certain risks and uncertainties, which could cause actual results, outcomes, and the timing of events to differ materially from the results discussed in the forward-looking statements.

In addition, these forward-looking statements are subject to the risks and uncertainties discussed in the “Risk Factors” section and elsewhere in this document. Such statements speak only as of the date on which they are made, and, except as required by law, we undertake no obligation to update any forward-looking statement to reflect events or circumstances after the date on which the statement is made or to reflect the occurrence of unanticipated events. New factors emerge from time to time, and it is not possible for us to predict which factors will arise. In addition, we cannot assess the impact of each factor on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements.

In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. These statements are based upon information available to us as of the date of this Annual Report on Form 10-K, and while we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and investors are cautioned not to unduly rely upon these statements.

PART I

ITEM 1. BUSINESS

Overview

We are a biopharmaceutical company focused on discovering, developing and commercializing novel muscle activators and muscle inhibitors as potential treatments for debilitating diseases in which muscle performance is compromised and/or declining. We have discovered and are developing muscle-directed investigational medicines that may potentially improve the healthspan of people with devastating cardiovascular and neuromuscular diseases of impaired muscle function. Our first commercial product is MYQORZO™ (aficamten), 5 mg, 10 mg, 15 mg, and 20 mg tablets, which the FDA approved in December 2025. MYQORZO is an allosteric and reversible inhibitor of cardiac myosin motor activity. The approval of MYQORZO included a risk evaluation and mitigation strategy (REMS) program to ensure the benefits of the drug outweigh the risk of heart failure due to systolic dysfunction. In patients with oHCM, myosin inhibition with MYQORZO reduces cardiac contractility and left ventricular outflow tract obstruction. MYQORZO became available for prescription to patients on or around January 27, 2026. In addition, in February 2026, the European Commission approved MYQORZO® (aficamten), 5 mg, 10 mg, 15 mg and 20 mg tablets for the treatment of symptomatic (New York Heart Association, NYHA, class II-III) oHCM in adult patients. Moreover, in December 2025, the China National Medical Products Administration approved MYQORZO for the treatment of adults with (New York Heart Association class II-III) oHCM, to improve exercise capacity and symptoms.

Behind MYQORZO, we are making disciplined pipeline investments in investigational products that are at discovery, preclinical and clinical stages of research and development. All our research and development activities relate to the biology of muscle function and have evolved from our knowledge and expertise regarding the cytoskeleton, a complex biological infrastructure that plays a fundamental role within every human cell. As a leader in muscle biology and the mechanics of muscle performance, we are discovering and developing small molecule drug candidates specifically engineered to impact muscle function and contractility with the objective of building a sustainable specialty biopharmaceutical business.

Our specific focus on the biology of the cytoskeleton distinguishes us from other biopharmaceutical companies and potentially positions us to identify or discover and develop and commercialize novel therapeutics that may be useful for the treatment of severe diseases and medical conditions. We intend to leverage our experience in muscle contractility to expand our current pipeline and expect to identify additional potential drug candidates that may be suitable for clinical development and commercialization.

Corporate Strategy

We are discovering, developing and commercializing small molecule drugs and drug candidates specifically engineered to modulate muscle function to improve patient healthspan. With the approval of our first medicine, MYQORZO, we have transitioned into a fully-integrated specialty biopharmaceutical company.

In 2025, we articulated our five-year strategic plan, Vision 2030: “Empowering Muscle, Empowering Lives,” designed to enable Cytokinetics to become a leading muscle biology specialty biopharmaceutical company intent on meaningfully improving the lives of patients through global access to our innovative medicines.

The key components of our five-year corporate strategy are:

INNOVATION: Advance 2 product approvals across 3 indications and 10 novel molecular entities into our pipeline

Our myosin platform is the cornerstone of our innovation and the anchor of our portfolio of medicines and potential medicines is MYQORZO. MYQORZO was approved in December 2025 by the FDA for treatment of adults with symptomatic oHCM to improve functional capacity and symptoms and the China National Medical Products Administration for the treatment of adults with (New York Heart Association class II-III) oHCM to improve exercise capacity and symptoms. In February 2026, the European Commission approved MYQORZO® (aficamten), 5 mg, 10 mg, 15 mg and 20 mg tablets for the treatment of symptomatic (New York Heart Association, NYHA, class II-III) obstructive hypertrophic cardiomyopathy in adult patients. Over the next five years, based on our comprehensive clinical development program, we believe we may achieve regulatory approvals in other geographies for aficamten in oHCM, as well as regulatory approvals in multiple geographies for nHCM, subject to the results of ACACIA-HCM, our Phase 3 clinical trial evaluating the use of aficamten in patients with nHCM. Subject to the results of COMET-HF, we may also potentially achieve regulatory approvals for omecamtiv mecarbil for the treatment of symptomatic heart failure with severely reduced ejection fraction. We also intend to advance two earlier stage new chemical entities in clinical development programs: (i) ulacamten for the potential treatment of a subgroup of patients with symptomatic HFpEF with hypercontractility and ventricular hypertrophy and (ii) CK-089, which has potential therapeutic application to a specific type of muscular dystrophy and other conditions of impaired muscle function. Furthermore, we have the objective to bring additional new product candidates into clinical development through both internal research activities and by leveraging external collaborators, seeking complementary potential therapies to support our late-stage cardiovascular franchise and emerging neuromuscular pipeline.

IGNITION: Achieve broad access and rapid use of our medicines in 15 countries throughout North America and Europe

Given our focus on disease areas for which there are serious unmet medical needs, we direct our activities to potential commercial opportunities in concentrated and tractable customer segments, such as to disease-specific centers of excellence and cohorts of focused healthcare professionals, that may be addressed by targeted sales forces. In preparing for the commercialization of MYQORZO, we built a marketing, sales and sales distribution infrastructure in the U.S., and in light of the European Commission approving MYQORZO® (aficamten), 5 mg, 10 mg, 15 mg and 20 mg tablets for the treatment of symptomatic (New York Heart Association, NYHA, class II-III) obstructive hypertrophic cardiomyopathy in adult patients, we are also preparing for a commercial launch in Europe in 2026, initially in Germany, to be followed by other major European countries. In addition, we have entered into licensing agreements with Sanofi in China and Bayer in Japan and expect to establish additional licensing or distribution arrangements in other areas of the world to drive accessibility of our medicines to patients worldwide. Central to our commercialization strategy is having a clear understanding and expertise in navigating the regulatory and payer landscape in each geography along with market research and advanced analytics to inform positioning, messaging and value proposition development

IMPACT: Reach 100,000 patients globally with our medicines.

As we build our specialty cardiology franchise, beginning with the commercialization of MYQORZO, we are committed to targeting disease areas of high unmet need in which there are either limited treatment options or in which the available treatments do not address the underlying disease. We believe there are hundreds of thousands of patients who may benefit from clinically meaningful outcomes delivered by our science focused on the biology of muscle function, as measured by improvements in clinical, social and psychological aspects, including patients' overall quality of life.

INSPIRATION: Foster a patient-centric culture with an emphasis on equitable access

We consider patients as we advance research, clinical development and commercialization. By prioritizing systematic patient engagement, we foster a culture of empathy and collaboration, ensuring that the voice of the patient remains central to our decision-making process. In line with our patient-centric approach, we proactively seek to include patients from diverse populations in our clinical trials, representative of real-world experience, including a range of genders, ethnicities, socioeconomic status and backgrounds. In commercializing our first medicine, we aspire to provide equitable access for all patients regardless of gender, ethnicity or location and we are developing programs for patients and healthcare providers to facilitate access accordingly. These programs may include support to help understand and navigate insurance coverage and obtain financial assistance for eligible patients; comprehensive patient and office education and resources to help navigate the patient’s treatment journey, support to manage logistical challenges that prevent patients from starting and staying on therapy and behavioral and wellness tools and resources to support patient engagement and help manage adherence to treatment.

INGENUITY: Extend leadership in muscle deploying multiple therapeutic modalities

After expanding our discovery platform to include muscle mechanics, muscle metabolism, and muscle health and regeneration, we are seeking to expand our research modalities to better enable our programs to address more difficult-to-drug molecular targets. This diversification in modalities will allow us to interrogate areas adjacent to our expertise in small molecules, such as targeted protein degraders, oligonucleotides and tissue targeting. With these additional modalities in our R&D armamentarium, we expect to have the opportunity to investigate disease causing targets that lack enzymatic activities, require near complete inhibition for clinical efficacy or have adverse effects in non-target tissues. We believe we can expand into new modalities through a combination of building internal expertise and capabilities and through external collaborations with industry partners and academic institutions.

Building a Specialty Cardiology Franchise

We believe we are well positioned to build a specialty cardiology franchise anchored by MYQORZO and, later complemented by earlier stage drug candidates that have arisen from our research and leadership in muscle biology and the mechanics of contractility. We anticipate that MYQORZO, the first approved product in our business franchise, will help serve unmet needs in the growing oHCM market. In addition to the oHCM market, if results from ACACIA-HCM are positive and support filing for registration, aficamten may receive regulatory approval for the treatment of adult patients with symptomatic nHCM. We further believe that our pioneering research directed to the same biology and emerging pharmacology could result in an expansion of our business franchise with the development and potential approval of ulacamten for the treatment of a subset of patients with HFpEF whose hypercontractility resembles that of patients with nHCM, as well as the development and potential approval of omecamtiv mecarbil, a cardiac myosin activator, for the treatment of patients with symptomatic heart failure with severely reduced ejection fraction.

Our specialty cardiology franchise is focused on advancing MYQORZO and other potential medicines that can address the high unmet needs of patients primarily treated by a concentrated segment of cardiologists. Specifically, HCM is primarily diagnosed and treatment initiated by approximately 10,000 cardiologists in the U.S., including in both academic centers of excellence and targeted community settings. We aim to achieve commercial returns from our targeted specialty franchise business by deploying experienced sales representatives with established rapport with their potential customers and by coupling their selling activities with high-touch customer support services designed to support prescribers and patients alike.

Cytokinetics’ Marketed Product: MYQORZO™

MYQORZO™ (aficamten), is a novel, oral, small molecule cardiac myosin inhibitor that our scientists discovered for the treatment of symptomatic oHCM. MYQORZO was designed to reduce the hypercontractility associated with HCM. In preclinical models, MYQORZO reduces myocardial contractility by binding directly to cardiac myosin at a distinct and selective allosteric binding site, thereby preventing myosin from entering a force producing state. MYQORZO reduces the number of active actin-myosin cross bridges during each cardiac cycle and consequently reduces myocardial contractility.

HCM is the most common monogenic inherited cardiovascular disorder, with well over 300,000 patients diagnosed in the U.S. However, there are an estimated 400,000-800,000 additional patients who remain undiagnosed. The diagnosis rate for oHCM is growing at approximately the same rate as the population, while the diagnosis rate for nHCM has been increasing with recent year-over-year growth estimated to be in the low double digits. Estimates vary but we believe approximately half of patients with HCM have oHCM, in which the thickening of the cardiac muscle leads to LVOT obstruction, while the remaining HCM patients have nHCM, in which blood flow is not impacted, but the heart muscle is still thickened. HCM is fairly evenly split across gender and while patients are typically diagnosed in their early 40s, the average age of an oHCM patient is in the early 60s. People with HCM are at high risk of also developing cardiovascular complications, including atrial fibrillation, stroke and mitral valve disease. People with HCM are at risk for potentially fatal ventricular arrhythmias, and HCM is one of the leading causes of sudden cardiac death in younger people or athletes. A subset of patients with HCM are at high risk of progressive disease leading to dilated cardiomyopathy and heart failure necessitating cardiac transplantation.

In December 2025, the FDA approved MYQORZO, 5 mg, 10 mg, 15 mg, and 20 mg tablets for the treatment of adults with symptomatic oHCM to improve functional capacity and symptoms. MYQORZO is an allosteric and reversible inhibitor of cardiac myosin motor activity. The approval of MYQORZO included a risk evaluation and mitigation strategy (REMS) program to ensure the benefits of the drug outweigh the risk of heart failure due to systolic dysfunction. In addition, in February 2026, the European Commission approved MYQORZO® (aficamten), 5 mg, 10 mg, 15 mg and 20 mg tablets for the treatment of symptomatic (New York Heart Association, NYHA, class II-III) obstructive hypertrophic cardiomyopathy (oHCM) in adult patients. Moreover, in December 2025, the China National Medical Products Administration approved MYQORZO for the treatment of adults with (New York Heart Association class II-III) oHCM, to improve exercise capacity and symptoms.

We commenced commercial sales of MYQORZO in the United States in the first quarter of 2026 and expect to report our first commercial revenues in May 2026 in our Quarterly Report on Form 10-Q for the fiscal quarter ending March 31, 2026. Our market research supports our belief that MYQORZO will be highly competitive amongst cardiac myosin inhibitors, potentially eventually achieving a greater than 50% market share in the United States but also growing the cardiac myosin inhibitor category overall. We expect Sanofi to commence commercializing activities in China in 2026.

The commercial prospects for MYQORZO are based on three launch drivers: clinical evidence, our experience with HCPs and patients, and the approved label. Clinical evidence shows that treatment with MYQORZO in adult patients with symptomatic oHCM led to rapid and sustained reduction in obstruction and improvement in symptoms. Our experience with HCPs and patients informed our Cardiac Account Specialist (CAS) design, including its single point of contact and accountability for HCP's with our field sales organization and our bespoke patient support program, MYQORZO and You™..

We believe the MYQORZO prescribing information allows for flexibility to titrate as early as two weeks, with echo assessment within 2 to 8 weeks following dose initiation and any subsequent dose changes, and importantly, a patient's dose may be titrated as needed after each echo with no delay.

In the European Union, MYQORZO is approved for the treatment of symptomatic (New York Heart Association, NYHA, class II-III) oHCM in adult patients and anticipate commencing commercialization activities in Germany in the second quarter of 2026 to be followed by other major European countries. MYQORZO is approved in China for the treatment of adults with (New York Heart Association class II-III) oHCM, to improve exercise capacity and symptoms. We depend on Sanofi for commercialization of MYQORZO in China.

Finally, in January 2026 we submitted a supplemental NDA for MYQORZO to the FDA requesting to include the results of MAPLE-HCM, a Phase 3 randomized, double blind, active-comparator clinical trial of aficamten as monotherapy compared to metoprolol as a monotherapy in patients with obstructive HCM, in the label. Assuming a standard review period, we expect a potential approval of the supplemental NDA by the FDA in the fourth quarter of 2026.

Research and Development Programs

Our research and development activities related to muscle contractility include our cardiac muscle contractility programs and our skeletal muscle contractility programs. We also conduct research and development on novel treatments for disorders involving muscle function beyond muscle contractility.

Specialty Cardiology Programs

Our specialty cardiology program is focused on the cardiac sarcomere, the basic unit of muscle contraction in the heart. The cardiac sarcomere is a highly ordered cytoskeletal structure composed of cardiac myosin, actin and a set of regulatory proteins. Cardiac myosin is the cytoskeletal motor protein in the cardiac muscle cell. It is directly responsible for converting chemical energy into the mechanical force, resulting in cardiac muscle contraction. Our most advanced cardiac program, MYQORZO (aficamten), is based on the hypothesis that inhibitors of cardiac myosin may attenuate the hyperdynamic contraction resulting from pathologic mutations in the sarcomere that lead to hypertrophic cardiomyopathies. MYQORZO was approved in the U.S., Europe and China for the treatment of adults with symptomatic oHCM. We submitted a supplemental NDA to the FDA in January 2026 with the intent to include the results of MAPLE-HCM (a Phase 3 randomized, double blind, active-comparator clinical trial of aficamten as monotherapy compared to metoprolol as a monotherapy in patients with obstructive HCM) in the label. Finally, as described below, we are evaluating aficamten for the potential treatment of adults with symptomatic nHCM in ACACIA-HCM.

In addition, omecamtiv mecarbil is our late-stage clinical program directed to the hypothesis that activators of cardiac myosin may target the underlying deficit of cardiac contractility in heart failure with severely reduced ejection fraction and address certain adverse properties of existing positive inotropic agents. Omecamtiv mecarbil is a novel cardiac myosin activator that works by directly stimulating the activity of the cardiac myosin motor protein, without increasing the intracellular calcium concentration. This drug candidate accelerates the rate-limiting step of the myosin enzymatic cycle and shifts it in favor of the force-producing state. Rather than increasing the velocity of cardiac contraction, this mechanism lengthens the systolic ejection time, which results in increased cardiac function in a potentially more oxygen-efficient manner.

Aficamten

Aficamten is a novel, oral, small molecule cardiac myosin inhibitor that our scientists discovered for the treatment of HCM. Aficamten arose from an extensive chemical optimization program conducted with attention to therapeutic index and pharmacokinetic properties. Aficamten was designed to reduce the hypercontractility associated with HCM. In preclinical models, aficamten reduces myocardial contractility by binding directly to cardiac myosin at a distinct and selective allosteric binding site, thereby preventing myosin from entering a force producing state. Aficamten reduces the number of active actin-myosin cross bridges during each cardiac cycle and consequently reduces myocardial contractility. This mechanism of action may be therapeutically effective in conditions characterized by excessive hypercontractility, such as HCM. The preclinical pharmacokinetics of aficamten were characterized, evaluated and optimized for potential rapid onset, ease of titration and rapid symptom relief.

The FDA granted aficamten orphan drug designation for the treatment of symptomatic HCM in 2021.

The development program for aficamten has assessed its potential as a treatment to improve exercise capacity and relieve symptoms in patients with oHCM. In addition, development work is ongoing to assess aficamten for its potential long-term effects on cardiac structure and function.

Aficamten was evaluated in SEQUOIA-HCM, a positive pivotal Phase 3 clinical trial in patients with symptomatic oHCM. The results from SEQUOIA-HCM showed that treatment with aficamten for 24 weeks significantly improved exercise capacity compared to placebo, increasing peak oxygen uptake (pVO2) by 1.8 ml/kg/min compared to baseline in patients treated with aficamten versus 0.0 ml/kg/min in patients treated with placebo (p=0.000002). This treatment effect was consistent across all pre-specified subgroups, including patients receiving beta blockers. Statistically significant and clinically meaningful improvements were also observed in all 10 prespecified secondary endpoints, with functional and symptomatic improvements occurring within two weeks of initiating treatment with aficamten and sustained throughout the treatment period. There were no instances of worsening heart failure and no treatment interruptions due to low LVEF. Treatment emergent serious adverse events occurred in 5.6% of patients on MYQORZO (aficamten) and 9.3% of patients on placebo. Core laboratory echocardiographic LVEF was observed to be <50% in 5 patients (3.5%) on MYQORZO compared to 1 patient (0.7%) on placebo. Hypertension (8% vs 2%) was the only adverse reaction occurring in >5% of patients and more commonly on MYQORZO than on placebo. MYQORZO-associated increases in blood pressure are consistent with relief of LVOT obstruction and improved cardiac output. MYQORZO has been approved in the United States, the European Union, and China and, in each case as a treatment for adults with symptomatic oHCM.

Aficamten was also evaluated in MAPLE-HCM, a Phase 3 randomized, double blind, active-comparator clinical trial of aficamten as monotherapy compared to metoprolol as a monotherapy in patients with obstructive HCM. In May 2025, the company announced positive topline results from MAPLE-HCM and in August 2025 the company presented the primary results of MAPLE-HCM at the European Society of Cardiology Congress 2025. The primary endpoint in MAPLE-HCM was the mean change from baseline in pVO2 for aficamten compared to metoprolol after 24 weeks of treatment. MAPLE-HCM met its primary endpoint, demonstrating a statistically significant improvement in peak oxygen uptake (pVO2) from baseline to Week 24 for aficamten compared to metoprolol. For aficamten, the mean change in pVO2 from baseline to Week 24 was +1.1 mL/kg/min (95% CI 0.5 to 1.7) and for metoprolol was - 1.2 mL/kg/min (95% CI -1.7 to -0.8). The primary endpoint was statistically significant with a least-squares mean (LSM) difference between groups of 2.3 mL/kg/min (95% CI 1.5 to 3.1; p<0.0001). Overall, the rate of adverse events was similar between groups. At least one treatment-emergent adverse event was reported by 65 (73.9%) and 66 (75.9%) patients treated with aficamten and metoprolol, respectively. One patient receiving aficamten, a 69-year-old woman with multiple co-morbidities, developed a viral illness and subsequently died. Three patients receiving metoprolol terminated treatment due to adverse events. At least one treatment-emergent adverse event was reported by 65 (73.9%) and 66 (75.9%) patients treated with aficamten and metoprolol, respectively. The most common AE reported in excess (>5%) of the comparator was hypertension for aficamten (9 [10.2%] patients compared to 2 [2.3%] patients on metoprolol).

Aficamten continues to be evaluated in ACACIA-HCM, a Phase 3 clinical trial of aficamten in patients with nHCM; CEDAR-HCM, a clinical trial of aficamten in a pediatric population with oHCM; and FOREST-HCM, an open-label extension clinical study of aficamten in patients with HCM. We expect to report additional clinical data supporting a potential label expansion for aficamten in nHCM in the second quarter of 2026. We also expect to report complete enrollment in the adolescent cohort of CEDAR-HCM in the fourth quarter of 2026.

Collaboration for Commercialization of Aficamten in Greater China

We are party to a license and collaboration agreement, pursuant to which we granted to Corxel an exclusive license to develop and commercialize drug products containing aficamten in China and Taiwan. In the fourth quarter of 2024, Genzyme Corporation, an affiliate of Sanofi, acquired Corxel's rights to develop and commercialize drug products containing aficamten in China and Taiwan.

The China National Medical Products Administration approved MYQORZO (aficamten) for the treatment of adults with (New York Heart Association class II-III) oHCM, to improve exercise capacity and symptoms.

Collaboration for Commercialization of Aficamten in Japan

We are party to a collaboration and license agreement with Bayer Consumer Care AG, an affiliate of Bayer AG, for the exclusive development and commercialization of drug products containing aficamten in Japan, subject to certain reserved development rights of Cytokinetics to conduct ACACIA-HCM and CEDAR-HCM in Japan.

The first patient in Japan was dosed in ACACIA-HCM in the second quarter of 2025. The first patient was dosed in Bayer’s Phase 3 clinical trial in oHCM, CAMELLIA-HCM, in Japan in the third quarter of 2025.

Royalty Pharma Revenue Interest

We are party to a revenue interest agreement with RPI ICAV, the RP Aficamten RPA, pursuant to which RPI ICAV purchased rights to certain revenue streams from net sales of MYQORZO and any other future potential pharmaceutical products containing aficamten by us, our affiliates and our licensees. Pursuant to the terms of the RP Aficamten RPA, as amended, RPI ICAV is entitled to receive 4.5% of our worldwide annual net sales of MYQORZO and any other future potential products containing aficamten up to $5.0 billion and 1% of our annual net sales above $5.0 billion.

Omecamtiv mecarbil

We are developing omecamtiv mecarbil as a potential treatment across the continuum of care in heart failure with severely reduced ejection fraction both for use in the hospital setting and for use in the outpatient setting.

Omecamtiv mecarbil is a selective, small molecule cardiac myosin activator, the first of a novel class of myotropes designed to directly target the contractile mechanisms of the heart, binding to and recruiting more cardiac myosin heads to interact with actin during systole. Omecamtiv mecarbil is designed to increase the number of active actin-myosin cross bridges during each cardiac cycle and consequently augment the impaired contractility that is associated with heart failure with reduced ejection fraction, or HFrEF.

GALACTIC-HF

GALACTIC-HF is a Phase 3 cardiovascular outcomes clinical trial of omecamtiv mecarbil that was conducted by Amgen in collaboration with Cytokinetics. The primary objective of this double-blind, randomized, placebo-controlled multicenter clinical trial was to determine if treatment with omecamtiv mecarbil when added to standard of care is superior to standard of care plus placebo in reducing the risk of cardiovascular death or heart failure events in patients with high-risk chronic heart failure and reduced ejection fraction.

The results of GALACTIC-HF showed a statistically significant effect of treatment with omecamtiv mecarbil to reduce risk of the primary composite endpoint of CV death or heart failure events (heart failure hospitalization and other urgent treatment for heart failure) compared to placebo in patients treated with standard of care after a median duration of follow up of 21.8 months. A first primary endpoint event occurred in 1,523 of 4,120 patients (37.0%) in the omecamtiv mecarbil group and in 1,607 of 4,112 patients (39.1%) in the placebo group (hazard ratio, 0.92; 95% confidence interval [CI] 0.86, 0.99; p=0.025). This effect was observed without evidence of an increase in the overall rates of myocardial ischemic events, ventricular arrhythmias or death from cardiovascular or all causes.

COMET-HF Informed by Results from Patient Subgroup in GALACTIC-HF

Since our release of the primary results of GALACTIC-HF, we have conducted and announced supplemental and subgroup analyses suggesting that certain biologically plausible subgroups of patients treated with omecamtiv mecarbil in GALACTIC-HF may have benefited more than the general patient population in the trial. Based on these and other promising subgroup analyses from GALACTIC-HF and the high unmet need in patients with heart failure with severely reduced ejection fraction, we are continuing the development program for omecamtiv mecarbil and conducting a confirmatory study in a patient population similar to the approximately 4,000 prespecified subgroup of patients with an LVEF <28% in GALACTIC-HF. Accordingly, in the fourth quarter of 2024, we commenced patient enrollment in COMET-HF (Confirmation of Omecamtiv Mecarbil Efficacy Trial in Heart Failure), a Phase 3 multi-center, double-blind, randomized, placebo-controlled trial to assess the efficacy and safety of omecamtiv mecarbil in patients with symptomatic HFrEF with severely reduced ejection fraction. The primary endpoint of COMET-HF is the time to first event in the primary composite endpoint of cardiovascular death, first heart failure event, LVAD implantation or cardiac transplantation, or stroke. COMET-HF is expected to enroll approximately 1,800 patients randomized on a 1:1 basis to receive omecamtiv mecarbil or placebo for up to 48 weeks.

Royalty Pharma Revenue Interest

In 2017, we entered into a Royalty Purchase Agreement, which we refer to as the RP OM RPA, with Royalty Pharma Development Funding, LLC, or RPFT, and amended the RP OM RPA on January 7, 2022. Pursuant to the RP OM RPA, as amended, RPFT has a revenue interest entitling it to up to 5.5% of our and our affiliates’ and licensees’ worldwide net sales of drug products containing omecamtiv mecarbil.

In the second quarter of 2024, we entered into the RP OM Loan Agreement with RPDF. Pursuant to the RP OM Loan Agreement, RDPF has a revenue interest entitling it to quarterly payments in an amount equal to 2.0% of the annual worldwide net sales of drug products containing omecamtiv mecarbil, subject to a minimum floor amount ranging from $5.0 million to $8.0 million during the first 18 calendar quarters commencing on the calendar quarter during which FDA approval for any drug product containing omecamtiv mecarbil is obtained, as further described in Note 3 to our consolidated financial statements included in this Annual Report on Form 10-K under the section "Agreements with Royalty Pharma," on the condition that a new Phase 3 clinical trial of omecamtiv mecarbil is successful by June 30, 2028 and we receive the marketing approval from the FDA for omecamtiv mecarbil on or prior to December 31, 2029.

Ulacamten (f/k/a CK-586)

Ulacamten is a novel, selective, oral, small molecule cardiac myosin inhibitor designed to reduce the hypercontractility associated with heart failure with preserved ejection fraction, or HFpEF. Approximately half of the estimated 6.7 million patients in the United States with heart failure have HFpEF, and the prevalence of HFpEF is increasing. A subset of HFpEF patients with hypercontractility, ventricular hypertrophy, elevated biomarkers and symptoms of heart failure may benefit from treatment with a cardiac sarcomere inhibitor. Approximately 75% of patients with HFpEF die within five years of initial hospitalization, and 84% are re-hospitalized. Despite broad use of standard treatments and advances in care, the prognosis for patients with heart failure is poor.

In preclinical models, ulacamten reduced cardiac hypercontractility by decreasing the number of active myosin cross-bridges during cardiac contraction thereby reducing the contractile force, without effect on calcium transients. Ulacamten selectively inhibits the ATPase of intact cardiac myosin but does not inhibit the ATPase of subfragment-1 of myosin (S1) as does aficamten, a cardiac myosin inhibitor we have also developed. Unlike aficamten, the inhibitory effect of ulacamten requires the presence of the regulatory light chain (RLC) of myosin in the context of the intact myosin dimer (heavy meromyosin or HMM). In engineered human HCM heart tissues, ulacamten demonstrated a shallow force-concentration response and improved lusitropy. Lending support for investigating this mechanism of action in HFpEF, a subset of patients with HFpEF resemble patients with non-obstructive hypertrophic cardiomyopathy (HCM) in that those patients have higher ejection fractions, thickened walls of their heart, elevated biomarkers, and symptoms of heart failure. Data from a Phase 2 clinical trial of aficamten in patients with nHCM show that aficamten was well tolerated, improved patient reported outcomes (Kansas City Cardiomyopathy Questionnaire (KCCQ) and New York Heart Association (NYHA) Functional Class) and biomarkers, measures that are also relevant to HFpEF.

Phase 1 Trial Results

We conducted a Phase 1 double-blind randomized, placebo-controlled, multi-part single and multiple ascending dose clinical study with the goal of evaluating the safety, tolerability and PK of ulacamten when administered orally as single or multiple doses to healthy participants. The primary objective of this clinical study was to evaluate the safety, tolerability and PK of ulacamten when administered orally to healthy participants. The study design included seven single ascending dose cohorts (10 mg to 600 mg) comprised of 10 participants each, and two multiple-dose cohorts (100 and 200 mg once daily) comprised of 10 participants each. This study data demonstrated that ulacamten was safe and well tolerated in healthy participants. No serious adverse events were observed and the stopping criteria for the study were not met. The half-life of ulacamten was observed to be in the range of 14 to 17 hours. Ulacamten demonstrated dose-linearity without a change in half-life over a wide range of exposures, with a steady-state appearing evident within seven days of dosing. Left ventricular ejection fraction and left ventricular fractional shortening decreased from baseline in an exposure-dependent manner, and the pharmacokinetic/pharmacodynamic relationship appeared shallow and predictable. At the highest single dose of 600 mg, the mean decrease in LVEF was <5%. These results demonstrate pharmacologic properties that may enable once-daily fixed-dose administration in the future.

AMBER-HFpEF

In the fourth quarter of 2024, we announced the design of AMBER-HFpEF (Assessment of Ulacamten in a Multi-Center, Blinded Evaluation of Safety and Tolerability Results in HFpEF), a Phase 2 randomized, placebo-controlled, double-blind, multi-center, dose-finding clinical trial in patients with symptomatic HFpEF with left ventricular ejection fraction ≥ 60%. The primary objective is to evaluate the safety and tolerability profile of ulacamten compared to placebo. The secondary objectives include assessing the effect of ulacamten on LVEF and NT-proBNP, its pharmacokinetics, and its pharmacokinetic/pharmacodynamic relationship. AMBER-HFpEF is currently enrolling patients, and we expect to complete enrollment in cohort 2 of the study by the end of 2026.

Royalty Pharma Revenue Interest

In the second quarter of 2024, we entered into a Revenue Participation Right Purchase agreement, which we refer to as the RP Ulacamten RPA, with RPI ICAV, pursuant to which RPI ICAV purchased rights to certain revenue streams from worldwide net sales of drug products containing ulacamten by us, our affiliates or licensees. Under the RP Ulacamten RPA, in consideration of an up-front $50 million payment, RPI ICAV purchased a revenue interest entitling it to 1.0% of our annual worldwide net sales of drug products containing ulacamten. In addition, following the initiation of the first Phase 3 clinical trial (or the Phase 3 portion of the first Phase 2b/3 clinical trial) in heart failure with preserved ejection fraction in humans for ulacamten, RPI ICAV, at its sole discretion, has the right to purchase an additional revenue interest which if exercised would entitle it to an additional 3.5% of our annual worldwide net sales of drug products containing ulacamten in consideration of a payment equal to 50.0% of our future research and development costs of a Phase 3 trial of ulacamten up to a maximum of $150 million.

Neuromuscular Program

Our neuromuscular program is focused on the activation of the skeletal sarcomere, the basic unit of skeletal muscle contraction. The skeletal sarcomere is a highly ordered cytoskeletal structure composed of skeletal muscle myosin, actin, and a set of regulatory proteins, which include the troponins and tropomyosin. This program leverages our expertise developed in our ongoing discovery and development of cardiac sarcomere activator.

We believe that our skeletal sarcomere activators may lead to new therapeutic options for diseases and medical conditions associated with neuromuscular dysfunction and potentially also conditions associated with aging and muscle weakness and wasting. The clinical effects of muscle weakness and wasting, fatigue and loss of mobility can range from decreased quality of life to, in some instances, life-threatening complications. By directly improving skeletal muscle function, a small molecule activator of the skeletal sarcomere potentially could enhance functional performance and quality of life in patients suffering from diseases or medical conditions associated with skeletal muscle weakness or wasting.

In the fourth quarter of 2024, we announced that the first participants have been dosed in a Phase 1 randomized, double-blind, placebo-controlled, multi-part, single and multiple ascending dose clinical study of CK-089 in healthy human participants. CK-089 is a fast skeletal muscle troponin activator with potential therapeutic application to a specific type of muscular dystrophy and other conditions of impaired muscle function. The primary objective of this Phase 1 randomized, double-blind, placebo-controlled, multi-part single and multiple ascending dose clinical study is to evaluate the safety, tolerability and pharmacokinetics of CK-089 when administered orally as single or multiple doses to healthy participants. The study design includes single ascending dose cohorts and multiple-dose ascending cohorts comprised of 10 participants each. Our clinical development program for CK-089 is subject to a partial clinical hold from FDA that limits our ability to dose patients at doses anticipated to result in plasma exposures higher than certain levels, which may limit the ability of our Phase 1 trial to identify a therapeutic dose for CK-089. We conducted a Phase 1 evaluation, and we are in ongoing discussions with regulatory authorities to inform next steps.

Beyond Muscle Contractility

We developed preclinical expertise in the mechanics of skeletal, cardiac and smooth muscle that extends from proteins to tissues to intact animal models. Our translational research in muscle contractility has enabled us to better understand the potential impact of small molecule compounds that increase cardiac or skeletal muscle contractility and to apply those findings to the further evaluation of our drug candidates in clinical populations. In addition to contractility, other major functions of muscle play a role in certain diseases that could benefit from novel mechanism treatments. Accordingly, our knowledge of muscle contractility may serve as an entry point to the discovery of novel treatments for disorders involving muscle functions other than muscle contractility. We are leveraging our current understandings of muscle biology to investigate new ways of modulating these other aspects of muscle function for other potential therapeutic applications.

Manufacturing Resources and Product Supply

Our drug candidates require precise high-quality manufacturing that is compliant with good manufacturing processes (or foreign equivalent) and other applicable laws. We have no manufacturing capabilities and rely on third parties for the supply and sourcing of raw materials, the manufacture of active pharmaceutical ingredients and the manufacture and packaging of finished drug products for both clinical trial materials and commercial supply.

With respect to MYQORZO, we have secured long-term commercial supply agreements with contract manufacturing organizations in Asia, North America and Europe for the supply of raw materials, active pharmaceutical ingredient, finished drug product and both bottle and blister packaging, but each of these arrangements rely on single sources of supply. This strategy increases the risk that our supply chain may be interrupted. To reduce the inherent risk of reliance on single vendors for MYQORZO and mitigate potential interruption of supply, when and where possible, we are embarking on a multi-phase program to adding dual souring CMO’s and sites to our global supply chain. We expect this program to take several years to fully execute, receive regulatory approvals and become operational. We have selected suppliers with multiple manufacturing sites and rigorous quality control systems. We are also actively building additional safety stock inventory levels to offset this risk while the longer term dual sourcing strategy is being executed. and have embarked on a project to identify additional suppliers that could be used interchangeably.

For our portfolio of small molecules, we continue to expand our network through third-party contract manufacturers for our CMC and manufacturing needs. These third parties must comply with applicable regulatory requirements, including the FDA’s cGMP, the E.U.’s Guidelines on Good Distribution Practice, as well as other stringent regulatory requirements enforced by the FDA or foreign regulatory agencies, as applicable, and are subject to routine inspections. In addition, through our third-party contract manufacturers and data service providers, we continue to provide serialized commercial products as required to comply with the Drug Supply Chain Security Act.

We are mindful of the increasing risks of relying on sole source raw materials from countries where global trade disputes or restrictive legislation are possible. For example, we currently source key registered starting materials for aficamten from manufacturers in China. Although we do not anticipate any immediate difficulties in procuring raw materials from China, we are actively seeking to establish alternative geographically diverse supply arrangements for these particular registered starting materials and other raw materials and compounds.

Competition

There are several companies focused on the development of small molecules for the treatment of HCM, HFrEF, HFpEF and other diseases that MYQORZO and our drug candidates are intended to treat. Our competitors and potential competitors include major pharmaceutical and biotechnology companies, as well as academic research institutions, clinical reference laboratories and government agencies that are pursuing research activities similar to ours. Certain of the organizations competing with us have greater capital resources, larger research and development staff and facilities, deeper regulatory expertise and more extensive product manufacturing and commercial capabilities than we do, which may afford them a competitive advantage.

Competition for MYQORZO

MYQORZO competes with Camzyos® (mavacamten), a cardiac myosin inhibitor marketed by Bristol Myers Squibb, as a therapy for oHCM, along with generic therapies, specifically beta blockers and calcium channel blockers, which are currently considered first-line standard of care. In addition to Camzyos®, Edgewise Therapeutics, Lexicon, Tenaya and Braveheart Bio (Hengrui) are conducting clinical trials and could commercialize a drug that would compete with MYQORZO if successful. Other companies may also be conducting clinical trials and pre-clinical activities in HCM, and if successful, there may be other treatments approved for HCM, some of which may be complementary to MYQORZO and others of which may be competitive.

Camzyos® was approved by the FDA in 2022 with a comprehensive and mandatory REMS. We believe the MYQORZO label and REMS are sufficiently distinct from Camzyos® to be highly competitive in the oHCM market. We believe the oHCM market has the potential to exceed $5 billion in the U.S. and Europe combined by 2035.

We believe that our ability to successfully compete will depend on, among other things:

Competition for Omecamtiv Mecarbil

We believe the principal competition for omecamtiv mecarbil, if ultimately approved for sales and marketing by FDA and/or other regulatory agencies for the treatment of HFrEF, includes generic drugs, such as milrinone, dobutamine or digoxin and branded drugs approved for the treatment of HFrEF, such as Corlanor® (ivabradine) and Verquvo® (vericiguat). Omecamtiv mecarbil could also compete against other novel drug candidates and therapies in development, such as those being developed by Novartis AG, Merck & Co., Inc., Bayer AG, AstraZeneca PLC, Kardigan, Inc., and Bristol-Myers Squibb Company.

If approved, omecamtiv mecarbil is not intended to compete with guideline directed first line therapies and instead is intended to be a complementary add-on therapy for the subset of heart failure patients with severely reduced ejection fraction. The first line HFrEF generic therapies, including beta-blockers, angiotensin-converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), mineralocorticoid receptor antagonists (MRAs) as well the branded drugs such as Entresto® (sacubitril/valsartan) and the SGLT2 inhibitor class that have either expanded or are planning to expand their labels to include treatment of patients with heart failure, include Forxiga® (dapagliflozin), Invokana® (canagliflozin), and Jardiance® (empagliflozin).

The treatment landscape for HFrEF is crowded and evolving, especially given the addition of SGLT2 inhibitors as AHA/ACC/HFSA guideline directed medical therapy for HFrEF. SGLT2 inhibitors have steadily gained market share. In addition, there are a number of medical devices both marketed and in development for the treatment of patients living with heart failure.

We believe that our ability to successfully compete will depend on, among other things:

Competition for Ulacamten

We believe the principal competition for ulacamten, if ultimately approved for sales and marketing by FDA and/or other regulatory agencies for the treatment of HFpEF will include both in-class cardiac myosin inhibitors as well as general heart failure drugs with HFpEF labels, many of which will be generic. In-class competitive agents that are currently in development include Bristol Myers Squibb’s MYK-224, Shandong’s HRS-1893 and Edgewise’s EDG-15400. Approved drugs with HFpEF labels that will be generic include SGLT2 inhibitors (dapagliflozin and empagliflozin), mineralocorticoid receptor antagonists (finerenone), angiotensin receptor-neprilysin inhibitors (sacubitril/valsartan), and GLP-1 receptor agonists (semaglutide and tirzepatide). We expect that the treatment landscape will continue to evolve as we proceed towards potential regulatory approval. Therefore, ulacamten could also compete against other novel drug candidates and therapies in development, such as those being developed by Eli Lilly, Novo Nordisk, Mission Therapeutics, Cardurion Pharmaceuticals and potentially others that may still move into the clinic before potential approval of ulacamten.

We believe that our ability to successfully compete will depend on, among other things:

Intellectual Property Resources

Our policy is to seek patent protection for the technologies, inventions and improvements that we develop and consider important to the advancement of our business. We also rely on trade secrets, technical know-how and continuing innovation to develop and maintain our competitive position.

The following tables list certain granted U.S. and European patents that relate to our commercialization product and our most advanced drug candidate. Additional patent protection through granted patents in the U.S., Europe, or other foreign jurisdictions may be available, and additional patent applications in the U.S., Europe, or other foreign jurisdictions are being pursued. In addition to patent exclusivity, the products and drug candidates may be protected by regulatory exclusivities upon approval in some countries.

Aficamten

The following table describes certain issued U.S. and European patents that relate to aficamten. In addition to the patents listed below, we continue to pursue additional patent applications. At the appropriate time, the Company will pursue available patent term extensions and supplementary protection certificates in the U.S. and Europe that may, if issued, extend exclusivity beyond the patent expirations listed in the table.

*Stated expiration dates do not account for any patent term adjustment, patent term extension, supplementary protection certificates, or pediatric extensions that may be available. For example, on February 4, 2026, the Company filed an application for patent term extension with the U.S. Patent and Trademark Office for U.S. Patent No. 10,836,755, requesting an extension of the term to December 19, 2039, which is 14 years from the date of product approval.
^ In March 2025, Generics [UK] Limited filed an opposition in the European Patent Office (EPO) seeking revocation of European Patent No. 3740481. The Company submitted a response to the opposition in August 2025. An oral hearing is scheduled for June 2026.
^^ In February 2025, Generics [UK] Limited filed an opposition in the European Patent Office (EPO) seeking revocation of European Patent No. 3999180. The Company submitted a response to the opposition in June 2025. An oral hearing is anticipated in this proceeding at a time to be determined by the EPO.
^^^In October 2025, Synthon BV and an anonymous party filed oppositions in the European Patent Office (EPO) seeking revocation of European Patent No. 4370116. The Company is preparing a response. An oral hearing is anticipated in this proceeding at a time to be determined by the EPO.

In Japan, aficamten is protected by issued patents covering the composition of matter, polymorphic forms, and formulations of aficamten that expire between 2039 and 2040. At the appropriate time, the Company will pursue available patent term extension in Japan that may, if issued, extend exclusivity beyond the baseline patent expiration dates. In China, aficamten is protected by issued patents covering the composition of matter, polymorphic forms, and formulations of aficamten that expire between 2039 and 2040. The Company has filed an application for patent term extension for Chinese Patent No. 2019800091285, requesting an extension to December 16, 2039.

Omecamtiv Mecarbil

The following table describes certain issued U.S. and European patents that relate to omecamtiv mecarbil. In addition to the patents listed below, we continue to pursue additional patent applications. At the appropriate time, the Company will pursue available patent term extensions and supplementary protection certificates in the U.S. and Europe that may, if issued, extend exclusivity beyond the patent expirations listed in the table.

*Stated expiration dates do not account for any patent term adjustment, patent term extension, supplementary protection certificates, or pediatric extensions that may be available. If omecamtiv mecarbil is approved, an extension of the U.S. patent term may be available for one patent covering the approved drug, which could extend the term of the applicable patent by up to a maximum of five additional years but not to exceed a total of 14 years from the date of product approval.

In Japan, omecamtiv mecarbil is protected by issued patents covering the salt form and formulation of omecamtiv mecarbil that expire in 2034. In China, omecamtiv mecarbil is protected by issued patents covering the salt form and formulation of omecamtiv mecarbil that expire in 2034. At the appropriate time, the Company will pursue available patent term extensions in Japan and China that may, if issued, extend exclusivity beyond the baseline patent expiration dates.

For a description of the risks relating to our intellectual property, please see the risk factors under Item 1A of this report.

Compliance with Government Regulation

The Regulatory Process for Drug Development

Our business activities, including the manufacturing of our product candidates and our ongoing research and development activities are subject to extensive regulation by numerous governmental authorities in the United States and other countries. Regulation by these government authorities is a significant component in the development, manufacture and commercialization of pharmaceutical products and services. Before marketing in the United States, any new drug developed must undergo rigorous preclinical testing, clinical trials and an extensive regulatory clearance process implemented by the FDA under the Federal Food, Drug, and Cosmetic Act, as amended (the “FDCA”). The FDCA and other various federal, state and foreign statutes govern or influence the research, testing, manufacture, safety, labeling, storage, recordkeeping, approval, promotion, marketing, distribution, post-approval monitoring and reporting, sampling, quality, and import and export of our medicines. State, local, and other authorities also regulate pharmaceutical manufacturing.

Applicable legislation requires licensing of manufacturing and contract research facilities, carefully controlled research and testing of products, and governmental review and/or approval of results prior to marketing therapeutic products. Additionally, adherence to GLPs and cGCPs during nonclinical and clinical testing and cGMP during production is required. Our manufacturing CMOs are subject to periodic inspection by the FDA and other foreign equivalents to ensure that they are operating in compliance with cGMP requirements. In addition, marketing authorization for each new medicine may require a rigorous manufacturing pre-approval inspection by regulatory authorities. Post approval, there are strict regulations regarding changes to the manufacturing process, and, depending on the significance of the change, changes may require prior FDA approval. FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements upon us and any third-party manufacturers that we may decide to use.

In addition, we are subject to other state and federal laws, including, among others, anti-kickback laws, fraud and abuse, false claims laws, Sunshine Act, patient protection and affordable care, data privacy and security laws and regulations, and transparency laws that restrict certain business practices in the pharmaceutical industry. Violations of these healthcare laws can result in significant penalties, including civil, criminal and administrative penalties. Moreover, government coverage and reimbursement policies will both directly and indirectly impact our ability to successfully commercialize any future approved products, and such coverage and reimbursement policies will be impacted by enacted and any applicable future healthcare reform and drug pricing measures. Further, the United States and some foreign jurisdictions may consider and enact additional legislative and regulatory initiatives to change the healthcare system and modify these laws in ways that could affect the pharmaceutical industry.

U.S. Pharmaceutical Product Development Process

Prior to beginning any clinical trial with a product candidate in the United States, we must submit an IND to the FDA. An IND is a request for authorization from the FDA to administer an investigational new drug product to humans and must become effective before human clinical trials may begin. Clinical trials involve the administration of the investigational product to human subjects under the supervision of qualified investigators in accordance with GCPs, which include the requirement that all research subjects provide their informed consent for their participation in any clinical study. Clinical trials are conducted under protocols detailing, among other things, the objectives of the study, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated. Furthermore, an independent institutional review board (“IRB”) for each site proposing to conduct the clinical trial must review and approve the plan for any clinical trial and its informed consent form before the clinical trial begins at that site and must monitor the study until completed. Regulatory authorities, the IRB or the company may suspend a clinical trial at any time on various grounds, including a finding that the subjects are being exposed to an unacceptable health risk or that the trial is unlikely to meet its stated objectives. For purposes of NDA approval, human clinical trials are typically conducted in three sequential phases that may overlap.

Phase 1. The investigational product is initially introduced into healthy human subjects or patients with the target disease or condition. These studies are designed to test the safety, dosage tolerance, absorption, metabolism and distribution of the investigational product in humans, the side effects associated with increasing doses, and, if possible, to gain early evidence on effectiveness.

Phase 2. The investigational product is administered to a limited patient population with a specified disease or condition to evaluate the preliminary efficacy, optimal dosages and dosing schedule and to identify possible adverse side effects and safety risks. Multiple Phase 2 clinical trials may be conducted to obtain information prior to beginning larger and more expensive Phase 3 clinical trials.

Phase 3. The investigational product is administered to an expanded patient population to further evaluate dosage, to provide statistically significant evidence of clinical efficacy and to further test for safety, generally at multiple geographically dispersed clinical trial sites. These clinical trials are intended to establish the overall risk/benefit ratio of the investigational product and to provide an adequate basis for product approval.

In some cases, the FDA may require, or companies may voluntarily pursue, additional clinical trials after a product is approved to gain more information about the product. These so-called Phase 4 studies may be made a condition to approval of the NDA.

Companies may choose, but are not required, to conduct a foreign clinical study under an IND. When a foreign clinical study is conducted under an IND, all IND requirements must be met unless waived. When the foreign clinical study is not conducted under an IND, the company must ensure that the study complies with certain FDA regulatory requirements in order to use the study as support for an IND or application for marketing approval or licensure, including that the study was conducted in accordance with GCP, including review and approval by an independent ethics committee and use of proper procedures for obtaining informed consent from subjects, and the FDA is able to validate the data from the study through an onsite inspection if the FDA deems such inspection necessary. The GCP requirements encompass both ethical and data integrity standards for clinical studies.

To establish a new product candidate’s safety and efficacy, the FDA requires companies seeking approval to market a pharmaceutical drug product to submit extensive preclinical and clinical data, along with other information, for each indication for which the product will be labeled. The data and information are submitted to the FDA in the form of a New Drug Application, or NDA, which must be accompanied by payment of a significant user fee unless a waiver or exemption applies. Generating the required data and information for an NDA takes many years and requires the expenditure of substantial resources. Information generated in this process is susceptible to varying interpretations that could delay, limit or prevent regulatory approval at any stage of the process. The failure to demonstrate adequately the quality, safety and efficacy of a product candidate under development would delay or prevent regulatory approval of the product candidate. Under applicable laws and FDA regulations, each NDA submitted for FDA approval is given an internal administrative review within 60 days following submission of the NDA. If deemed sufficiently complete to permit a substantive review, the FDA will “file” the NDA. The FDA can refuse to file any NDA that it deems incomplete or not properly reviewable. The FDA has established internal goals of eight months from submission for priority review of NDAs that cover new product candidates that offer major advances in treatment or provide a treatment where no adequate therapy exists, and 12 months from submission for the standard review of NDAs. However, the FDA is not legally required to complete its review within these periods, these performance goals may change over time and the review is often extended by FDA requests for additional information or clarification. Moreover, the outcome of the review, even if generally favorable, may not be an actual approval but a “complete response letter” that describes additional work that must be done before the NDA can be approved. Before approving an NDA, the FDA can choose to inspect the facilities at which the product is manufactured and will not approve the product unless the manufacturing facility complies with cGMPs. The FDA may also audit sites at which clinical trials have been conducted to determine compliance with cGCPs and data integrity. The FDA’s review of an NDA may also involve review and recommendations by an independent FDA advisory committee, particularly for novel indications. The FDA is not bound by the recommendation of an advisory committee. Further, the FDA may require that certain contraindications, warnings or precautions be included in the product labeling.

In addition, under the Pediatric Research Equity Act (PREA), an NDA or supplement to an NDA must contain data to assess the safety and effectiveness of the drug product candidate for the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The Food and Drug Administration Safety and Innovation Act requires that a company who is planning to submit a marketing application for a drug product that includes a new active ingredient, new indication, new dosage form, new dosing regimen or new route of administration submit an initial pediatric study plan (PSP). Unless otherwise required by regulation, PREA does not apply to any drug product for an indication for which orphan designation has been granted, except that the PREA will apply to an original NDA for a new active ingredient that is orphan-designated if the drug is a molecularly targeted cancer product intended for the treatment of an adult cancer and is directed at a molecular target that the FDA determines to be substantially relevant to the growth or progression of a pediatric cancer.

If regulatory approval of a product is granted, such approval will be granted for particular indications and may entail limitations on the indicated uses for which such product may be marketed. For example, the FDA may approve the NDA with a REMS to ensure the benefits of the product outweigh its risks. A REMS is a safety strategy to manage a known or potential serious risk associated with a product and to enable patients to have continued access to such medicines by managing their safe use, and could include medication guides, physician communication plans, or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. The FDA also may condition approval on, among other things, changes to proposed labeling or the development of adequate controls and specifications. Once approved, the FDA may withdraw the product approval if compliance with pre-and post-marketing requirements is not maintained or if problems occur after the product reaches the marketplace. The FDA may require one or more Phase 4 post-market studies and surveillance to further assess and monitor the product’s safety and effectiveness after commercialization, and may limit further marketing of the product based on the results of these post-marketing studies.

Orphan Drug Designation and Exclusivity

Under the Orphan Drug Act of 1983, the FDA may grant orphan drug designation to a product candidate intended to treat a rare disease or condition, Orphan drug designation must be requested before submitting an NDA. After the FDA grants orphan drug designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. The orphan drug designation does not convey any advantage in, or shorten the duration of, the regulatory review or approval process.

If a product that has orphan drug designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the product is entitled to orphan drug exclusive approval (or exclusivity), which means that the FDA may not approve any other applications, including a full NDA, to market the same product for the same indication for seven years, except in limited circumstances. Orphan drug exclusivity does not prevent the FDA from approving a different drug for the same disease or condition, or the same drug for a different disease or condition.

A designated orphan drug may not receive orphan drug exclusivity if it is approved for a use that is broader than the indication for which it received orphan drug designation. In addition, exclusive marketing rights in the United States may be lost if the FDA later determines that the request for designation was materially defective or if the manufacturer is unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition.

There is some uncertainty with respect to the FDA’s interpretation of the scope of orphan drug exclusivity. Historically, exclusivity was specific to the orphan indication for which the drug was approved. As a result, the scope of exclusivity was interpreted as preventing approval of a competing product. However, in 2021, the federal court in Catalyst Pharmaceuticals, Inc. v. Becerra suggested that orphan drug exclusivity covers the full scope of the orphan-designated “disease or condition” regardless of whether a drug obtained approval for a narrower use.

Post Approval Requirements

Any products manufactured or distributed by us pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including, among other things, requirements relating to record-keeping, reporting of adverse experiences, periodic reporting, product sampling and distribution, and advertising and promotion of the product. After approval, most changes to the approved product, such as adding new indications or other labeling claims, are subject to prior FDA review and approval. There also are continuing user fee requirements, under which the FDA assesses an annual program fee for each product identified in an approved NDA. Drug manufacturers and their subcontractors are required to register their establishments with the FDA and certain state agencies and are subject to periodic unannounced inspections by the FDA and certain state agencies for compliance with cGMPs, which impose certain procedural and documentation requirements upon us and our third-party manufacturers. Changes to the manufacturing process are strictly regulated, and, depending on the significance of the change, may require prior FDA approval before being implemented.

FDA regulations also require investigation and correction of any deviations from cGMPs and impose reporting requirements upon us and any third-party manufacturers that we may decide to use. Accordingly, manufacturers must continue to expend time, money and effort in the area of production and quality control to maintain compliance with cGMPs and other aspects of regulatory compliance.

The FDA may withdraw approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches the market. Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information; imposition of post-market studies or clinical studies to assess new safety risks; or imposition of distribution restrictions or other restrictions under a REMS program. Other potential consequences include, among other things

The FDA closely regulates the marketing, labeling, advertising and promotion of drugs. A company can make only those claims relating to safety and efficacy that are approved by the FDA and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and regulations prohibiting the promotion of off-label uses. Failure to comply with these requirements can result in, among other things, adverse publicity, warning letters, corrective advertising and potential civil and criminal penalties.

Abbreviated New Drug Applications for Generic Drugs

In 1984, with passage of the Drug Price Competition and Patent Term Restoration Act of 1984 (commonly referred to as the “Hatch-Waxman Amendments”) amending the Federal Food, Drug, and Cosmetic Act (“FDCA”), Congress authorized the FDA to approve generic drugs that are the same as drugs previously approved by the FDA under the NDA provisions of the statute. To obtain approval of a generic drug, an applicant must submit an abbreviated new drug application (“ANDA”) to the agency. Upon approval of an ANDA, the FDA indicates that the generic product is “therapeutically equivalent” to the drug product previously approved under an NDA, known as the reference listed drug (“RLD”), and it assigns a therapeutic equivalence rating to the approved generic drug in its publication “Approved Drug Products with Therapeutic Equivalence Evaluations,” also referred to as the “Orange Book. Physicians and pharmacists consider the therapeutic equivalence rating to mean that a generic drug is fully substitutable for the RLD.

Under the Hatch-Waxman Amendments, the FDA may not approve an ANDA until any applicable period of nonpatent exclusivity for the RLD has expired. The FDCA provides a period of five years of data exclusivity for NDAs containing a new chemical entity. In cases where such exclusivity has been granted, an ANDA may not be filed with the FDA until the expiration of five years unless the submission is accompanied by a Paragraph IV certification (discussed further below), in which case the applicant may submit its application four years following the original product approval. The FDCA also provides for a period of three years of exclusivity if the NDA includes reports of one or more new clinical investigations, other than bioavailability or bioequivalence studies, that were conducted by or for the applicant and are essential to the approval of the application.

Hatch-Waxman Patent Certification and the 30 Month Stay

Upon approval of an NDA or a supplement thereto, NDA sponsors are required to list with the FDA each patent with claims that cover the applicant’s product or a method of using the product. When an ANDA applicant files its application with the FDA, the applicant is required to certify to the FDA concerning any patents listed for the reference product in the Orange Book, except for patents covering methods of use for which the ANDA applicant is not seeking approval.

A certification that the new product will not infringe the already approved product’s listed patents or that such patents are invalid or unenforceable is called a Paragraph IV certification. If the applicant does not challenge the listed patents or indicate that it is not seeking approval of a patented method of use, the ANDA application will not be approved until all the listed patents claiming the referenced product have expired. The filing of a patent infringement lawsuit automatically prevents the FDA from approving the ANDA until the earlier of 30 months, expiration of the patent, settlement of the lawsuit or a decision in the infringement case that is favorable to the ANDA applicant.

505(b)(2) New Drug Applications

As an alternative path to FDA approval for modifications to formulations or uses of products previously approved by the FDA pursuant to an NDA, an applicant may submit an NDA under Section 505(b)(2) of the FDCA. Section 505(b)(2) was enacted as part of the Hatch-Waxman Amendments and permits the filing of an NDA where at least some of the information required for approval comes from studies not conducted by, or for, the applicant, and for which the applicant has not obtained a right of reference. If the 505(b)(2) applicant can establish that reliance on the FDA’s previous findings of safety and effectiveness is scientifically and legally appropriate, it may eliminate the need to conduct certain preclinical studies or clinical trials of the new product.

To the extent that a Section 505(b)(2) applicant is relying on studies conducted for an already approved product, the applicant is required to certify to the FDA concerning any patents listed for the approved product in the Orange Book to the same extent that an ANDA applicant would. As a result, approval of a 505(b)(2) NDA can be stalled until all the listed patents claiming the referenced product have expired, until any non-patent exclusivity, such as exclusivity for obtaining approval of a new chemical entity, listed in the Orange Book for the referenced product has expired, and, in the case of a Paragraph IV certification and subsequent patent infringement suit, until the earlier of 30 months, settlement of the lawsuit or a decision in the infringement case that is favorable to the Section 505(b)(2) applicant.

Patent Term Extension

In the U.S., after an NDA is approved, owners of relevant drug patents may apply for up to a five-year patent extension, which permits patent term restoration as compensation for the patent term lost during the FDA regulatory process. The allowable patent term extension is typically calculated as one-half the time between, the latter of the effective date of an IND and issue date of the patent for which extension is sought, and the submission date of an NDA, plus the time between NDA submission date and the NDA approval date up to a maximum of five years. The time can be shortened if the FDA determines that the applicant did not pursue approval with due diligence. The total patent term after the extension may not exceed 14 years from the date of product approval. Only one patent applicable to an approved drug product is eligible for extension and only those claims covering the product, a method for using it, or a method for manufacturing it may be extended and the application for the extension must be submitted prior to the expiration of the patent in question. However, we may not be granted an extension because of, for example, failing to exercise due diligence during the testing phase or regulatory review process, failing to apply within applicable deadlines, failing to apply prior to expiration of relevant patents or otherwise failing to satisfy applicable requirements. Some, but not all, foreign jurisdictions possess patent term extension or other additional patent exclusivity mechanisms that may be more or less stringent and comprehensive than those of the U.S.

Pharmaceutical Coverage, Pricing and Reimbursement

In the United States and markets in other countries, sales of any products for which we receive regulatory approval for commercial sale will depend in part on the availability of coverage and adequate reimbursement from third-party payors, including government authorities, managed care providers, private health insurers and other organizations. In the United States, private health insurers and other third-party payors often provide reimbursement for products and services based on the level at which the government (through the Medicare or Medicaid programs) provides reimbursement for such products and services. There is no uniform coverage and reimbursement policy among third-party payors in the United States; however, private third-party payors often follow Medicare coverage policy and payment limitations in setting their own reimbursement rates. Third-party payors are increasingly examining the medical necessity and cost-effectiveness of medical products and services in addition to their safety and efficacy and, accordingly, significant uncertainty exists as to the coverage and reimbursement status of newly approved therapeutics.

In particular, in the United States, the European Union and other potentially significant markets for our product candidates, government authorities and third-party payors are increasingly attempting to limit or regulate the price of medical products and services, particularly for new and innovative products and therapies, which often has resulted in average selling prices that are lower than they would otherwise be. Third-party payors are increasingly challenging the prices charged for medical products and services, examining the medical necessity and reviewing the cost effectiveness of pharmaceutical products, medical devices and medical services, in addition to questioning safety and efficacy. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit sales of any product that receives approval.

Moreover, the U.S. government and state legislatures have continued implementing cost-containment programs, including price controls and restrictions on coverage and reimbursement and requirements for substitution of generic products. The IRA provides CMS with significant new authorities intended to curb drug costs and to encourage market competition. For the first time, CMS will be able to directly negotiate prescription drug prices and to cap out-of-pocket costs. Each year, CMS will select and negotiate a preset number of high-spend drugs that are covered under Medicare Part B and Part D that do not have generic or biosimilar competition. Since 2023, 25 Medicare Part D drugs have become subject to price negotiations. The IRA also provides a new “inflation rebate” covering Medicare patients that took effect in 2023 and is intended to counter certain price increases in prescriptions drugs. The inflation rebate provision requires drug manufacturers to pay a rebate to the federal government if the price for a drug under Medicare Part B and Part D increases faster than the rate of inflation. Notwithstanding these provisions, the IRA’s impact on commercialization and competition remains largely uncertain.

In addition, net prices for drugs may be reduced by mandatory discounts or rebates required by government healthcare programs or private payors and by any future relaxation of laws that presently restrict imports of drugs from countries where they may be sold at lower prices than in the U.S. Increasingly, third-party payors are requiring that drug companies provide them with predetermined discounts from list prices and are challenging the prices charged for medical products. We cannot be sure that reimbursement will be available for any product candidate that we may commercialize and, if reimbursement is available, the level of reimbursement.

Moreover, there has recently been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products, which has resulted in several Congressional inquiries and proposed and enacted federal and state measures designed to, among other things, reduce the cost of prescription drugs, bring more transparency to product pricing, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drug products. For example, in May 2025, the Trump Administration renewed the idea of international reference pricing through an executive order entitled “Delivering Most-Favored-Nation Prescription Drug Pricing to American Patients”, which, among other things, directs the U.S. Department of Health and Human Services (“HHS”) and other agencies to communicate most-favored-nation price targets to pharmaceutical manufacturers to bring prices for U.S. patients in line with comparably developed nations and to facilitate direct-to-consumer purchasing programs. HHS subsequently issued guidance indicating the MFN target price will be the lowest price paid in an Organization for Economic Co-operation and Development country with a gross domestic product, or GDP, per capita of at least 60% of the U.S. GDP per capital. In addition, in late 2025, CMS proposed new drug payment models to lower drug prices for Medicare and Medicaid beneficiaries; under the models, CMS would explore potential adjustments to drug rebate calculations by comparison to international drug pricing information.

Individual states in the U.S. have also become increasingly active in passing legislation and implementing regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain drug access and marketing cost disclosure and transparency measures, and encourage importation from other countries and bulk purchasing.

These developments will put additional pressure on product pricing, reimbursement and utilization, which may adversely affect our future product sales and results of operations. These pressures can arise from rules and practices of managed care groups, judicial decisions and governmental laws and regulations related to Medicare, Medicaid and healthcare reform, pharmaceutical reimbursement policies and pricing in general. As a result, coverage and adequate third-party reimbursement may not be available for our product candidates to enable us to realize an appropriate return on our investment in research and product development.

The market for MYQORZO and any of our other products for which we receive regulatory approval for commercial sale depends significantly on access to third-party payors’ drug formularies or lists of medications for which third-party payors provide coverage and reimbursement. The industry competition to be included in such formularies often leads to downward pricing pressures on pharmaceutical companies. Also, third-party payors may refuse to include a particular branded drug in their formularies or may otherwise restrict patient access to a branded drug when a less costly generic equivalent or other alternative is available. In addition, because each third-party payor individually approves coverage and reimbursement levels, obtaining coverage and adequate reimbursement is a time-consuming and costly process. We would be required to provide scientific and clinical support for the use of any product to each third-party payor separately with no assurance that approval would be obtained, and we may need to conduct expensive pharmacoeconomic studies in order to demonstrate the cost-effectiveness of our products. This process could delay the market acceptance of any of our product candidates for which we may receive approval and could have a negative effect on our future revenue and operating results. We cannot be certain that our product candidates will be considered cost-effective. If we are unable to obtain coverage and adequate payment levels for our product candidates from third-party payors, physicians may limit how much or under what circumstances they will prescribe or administer them, and patients may decline to purchase them. This in turn could affect our ability to successfully commercialize our products and impact our profitability, results of operations, financial condition, and future success.

Cytokinetics Human Capital

As of December 31, 2025, we had 673 employees.

We are committed to fostering and maintaining a culture that engenders collaboration and teamwork, inclusion, respect, transparency and candor. We provide our employees with an array of professional development resources and tools to support their learning, growth and development opportunities. We prioritize safety and endeavor to eliminate workplace incidents, risks and hazards through the implementation of our safety policies and standards. We have adopted a flexible, hybrid working arrangement for our employees, allowing some of our employees to work remotely during certain days of the week. We were honored to be recognized as a San Francisco Times Great Place to Work in 2025.

Our compensation and benefit programs are designed to enable us to attract and retain the best employees in a very competitive life science sector and we regularly benchmark and survey the market so that we maintain competitive programs. In addition, we routinely survey our employees to measure engagement, identify and take action on opportunities for improvement, and share these results with employees.

We have a rigorous annual goal setting and goal evaluation process under the supervision of the Compensation and Talent Committee of our Board of Directors and senior management to assist our employees in understanding what is expected of them individually and as an organization.

Our Compensation and Talent Committee of the Board of Directors regularly reviews employee engagement, reward programs, human resource metrics, including attrition, retention and staffing.

Investor Information

We file electronically with the SEC our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K pursuant to Section 13 or 15(d) of the Exchange Act. The SEC maintains an Internet site at www.sec.gov that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

ITEM 1A. RISK FACTORS

In evaluating our business, you should carefully consider the following risks in addition to the other information in this report. Any of the following risks could materially and adversely affect our business, results of operations, financial condition, cash flows, reputation or your investment in our securities, and many are beyond our control. The risks and uncertainties described below are not the only ones facing us. Additional risks and uncertainties not presently known to us, or that we currently see as immaterial, may also adversely affect our business. The disclosures in this section reflect our beliefs and opinions as to factors that could materially and adversely affect us in the future. References to past events are provided by way of example only and are not intended to be a complete listing or a representation as to whether or not such factors have occurred in the past. The information discussed below should be considered carefully with the other information contained in this Annual Report on Form 10-K and the other documents and materials we file with the SEC, as well as news releases and other information we publicly disseminate from time to time.

Risks Specific to our Company in connection with our Commercial Operations

If physicians and patients do not accept our drugs, we may be unable to generate significant revenue, if any.

MYQORZO may not gain market acceptance among physicians, healthcare payors, patients and the medical community, and our other drug candidates, if approved, may similarly fail to gain market acceptance. Even if the clinical safety and efficacy of drugs developed from our drug candidates are established for purposes of approval, physicians may elect not to recommend these drugs for a variety of reasons including, but not limited to the availability of competitive drugs to the market, cost-effectiveness, availability of insurance coverage and reimbursement, convenience and ease of administration, prevalence and severity of adverse events, HCP practice patterns and familiarity with earlier to market therapies.

The size of the potential market for MYQORZO or our product candidates is difficult to estimate and, if any of our assumptions are inaccurate, the actual markets for our products or product candidates may be smaller than our estimates. If the market opportunities for any products or product candidates we develop are smaller than we believe they are, or if any approval that we obtain is based on a narrower definition of the patient population, our potential revenues may be adversely affected, and our business may suffer.

Our potential market opportunity for oHCM, nHCM, and other indications is based on internal and third-party estimates and resources, including, without limitation, our estimates and research, as well as industry and general publications and research, surveys and studies conducted by Cytokinetics and third parties, which may be incorrect. Our estimated potential market opportunity for cardiac myosin inhibitors in oHCM and nHCM is based on the following assumptions: our understanding of the prevalence of HCM in the general population from published epidemiological studies and analysis of longitudinal claims data, the percentage split of diagnosed oHCM and nHCM patients derived from publications, market research and patient transaction databases, the percentage of available symptomatic patients not adequately managed by the current standard of care among diagnosed HCM patients, rates of patient compliance and persistence, based on patient transaction database and/or third-party market research. The conditions supporting our assumptions or estimates and the market data supporting these assumptions and estimates may change at any time or otherwise be inaccurate, thereby reducing the predictive accuracy of these underlying factors.

Our total addressable market will ultimately depend upon, among other things, the willingness of patients and HCPs to utilize MYQORZO compared to other cardiac sarcomere inhibitors or other therapies, the number of actual treatable symptomatic patients on MYQORZO and other cardiac myosin inhibitors or other therapies over time, the subset of eligible HCM patients who may utilize MYQORZO, acceptance and accessibility of our drug products by the medical community and patients, market share, drug pricing and reimbursement across payer types (i.e., Medicare, commercial, Medicaid, etc.). The number of patients within the United States and other major markets and elsewhere may turn out to be materially lower than expected, patients may not be otherwise amenable to treatment with our drugs or new patients may become increasingly difficult to identify or gain access to, all of which would harm our results of operations and our business. If our conclusions, analysis or internally generated data prove to be inaccurate or we make errors in our assumptions based on that data, our total addressable market may be meaningfully smaller than we have estimated, our future growth opportunities and sales growth may be impaired, any of which could have a material adverse effect on our business, financial condition and results of operations.

Our competitors may develop drugs that are less expensive, safer and/or have similar or better efficacy than ours, which may diminish or eliminate the commercial success of any drugs that we may commercialize.

We compete with companies that have developed drugs or are developing drug candidates for cardiovascular diseases, diseases and conditions associated with muscle weakness or wasting and other diseases for which our drug candidates may be useful treatments. We also compete for market share against large pharmaceutical and biotechnology companies and smaller companies that are collaborating with larger pharmaceutical companies, new companies, academic institutions, government agencies and other public and private research organizations. Many of these competitors, either alone or together with their partners, develop new drug candidates that can compete with ours. Many of these competitors have larger research and development programs or substantially greater financial resources than we do. If our competitors market drugs that are less expensive, safer and/or have similar or better efficacy than MYQORZO, or any other drugs that we may commercialize in the future, or that reach the market sooner than MYQORZO, or any other drugs that we may commercialize in the future, we may not achieve commercial success.

The commercial success of our products depends on the availability and sufficiency of third‑party payor and/or government for coverage and reimbursement.

Patients in the United States and elsewhere generally rely on third‑party payors and/or governments to reimburse part or all of the costs associated with their prescription drugs. Accordingly, market acceptance of our products is dependent on the extent to which third‑party coverage and reimbursement is available from government health administration authorities (including in connection with government healthcare programs, such as Medicare and Medicaid in the United States), private healthcare insurers and other healthcare funding organizations. Significant uncertainty exists as to the coverage and reimbursement status of any products for which we may obtain regulatory approval. Even if we obtain coverage for a given drug product, the timeframe from approval to coverage could be lengthy, inadequate, and/or the associated reimbursement rate may not be adequate to cover our costs, including research, development, intellectual property, manufacture, sale and distribution expenses, or may require co‑payments that patients find unacceptably high.

We historically have had limited interactions and relationships with payors. Our ability to engage with US payors and secure coverage may improve as we commercialize MYQORZO and generate additional clinical and real-world evidence. Over time, we anticipate our drugs will be adopted by our patients as indicated by their labels. To achieve this adoption, our drugs will need to be widely reimbursed via medical exception or listed in formularies of major pharmacy benefit managers and payors in the U.S. These major pharmacy benefit managers and payors include Medicare, Medicaid, VA, DoD, TriCare, and commercial payors. The process to achieve coverage with pharmacy benefit managers and payors can be time consuming, is not guaranteed and if achieved can impact profitability given the level of rebates often required.

Coverage and reimbursement policies for drug products can differ significantly from payor to payor as there is no uniform policy of coverage and reimbursement for drug products among third‑party payors in the United States. There may be significant delays in obtaining coverage and reimbursement as the process of determining coverage and reimbursement is often time‑consuming and costly which will require us to provide scientific and clinical support for the use of our products to each payor separately, with no assurance that coverage or adequate reimbursement will be obtained. It is difficult to predict at this time what third parties will decide with respect to coverage and reimbursement for our products. Coverage policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

In addition, there is significant uncertainty regarding the reimbursement status of newly approved healthcare products. We may need to conduct expensive pharmacoeconomic studies to demonstrate the cost-effectiveness of our products. If third-party payors do not consider our products to be cost-effective compared to other therapies, the payors may not cover our products as a benefit under their plans, or if they do, the level of payment may not be sufficient to allow us to sell our products on a profitable basis.

Additionally, to the extent required by regulatory authorities for the safe and effective use of any of our drug products, we or our partners may develop companion diagnostic tests for use with our products or product candidates such as with omecamtiv mecarbil. Companion diagnostic tests require coverage and reimbursement separate and apart from the coverage and reimbursement for their companion pharmaceutical or biological products. Similar challenges to obtaining coverage and reimbursement, applicable to pharmaceutical products, will apply to companion diagnostics and could adversely impact the commercial prospects of omecamtiv mecarbil or any other drug we may develop that requires a companion diagnostic test.

If we are unable to obtain and maintain sufficient third‑party coverage and adequate reimbursement for our products, the commercial success of MYQORZO, as well as any future marketed drug products may be greatly hindered and our financial condition and results of operations may be materially and adversely affected.

We have no manufacturing capabilities and depend on single source contract manufacturers to produce our commercial product and clinical trial materials, including our drug candidates, and will have continued reliance on contract manufacturers for the development and commercialization of our potential drugs.

We do not operate manufacturing facilities for clinical or commercial production of our drugs and drug candidates. We lack the resources and the capabilities to manufacture any of our drug candidates on a clinical or commercial scale.

In addition, under our license and collaboration agreements, we have committed to providing Sanofi and Bayer with supply of aficamten for development and commercialization of MYQORZO in China, Taiwan and Japan, which we will have to source from our contract manufacturers.

We currently rely on single source CMOs for the manufacture of any or all of MYQORZO as a finished drug product and the active pharmaceutical ingredient and registered starting materials used in the production of MYQORZO. We also rely on a single source CMO for the packaging of MYQORZO in blister packaging for use in Europe. If these CMOs fail to provide us with sufficient quantities of product or fail to comply with manufacturing regulations, our business could be harmed. Switching CMOs or manufacturing sites would be difficult and time-consuming because the number of potential CMOs is limited. In addition, before a drug from any replacement CMO or manufacturing site can be commercialized, the FDA and, in some cases, foreign regulatory agencies, must approve that site. These approvals would require regulatory testing and compliance inspections. A new CMO or manufacturing site also would have to be educated in, or develop substantially equivalent processes for, production of our drugs and drug candidates. It may be difficult or impossible to transfer certain elements of a manufacturing process to a new CMO or for us to find a replacement CMO on acceptable terms quickly, or at all, either of which would delay or prevent our ability to develop drug candidates and commercialize any resulting drugs.

We also expect to rely on single source CMOs to supply all future drugs and drug candidates for which we conduct development, as well as other materials required to conduct our clinical trials, and to fulfil our obligations under our license and collaboration agreements. If our existing or future CMOs fail to, or are unable to perform satisfactorily or if any of the raw materials, drug substance, or drug products are subject to restrictive import/export controls or tariffs, it could impede commercialization or delay development or regulatory approval of our drug candidates or commercialization of our drugs, producing additional losses and depriving us of potential product revenues, and also lead to our breach of one of our license and collaboration agreements, giving rise to the ability to terminate such agreements and other adverse consequences as stipulated in such agreements. In addition, if a CMO fails to, or is unable to, perform as agreed, our ability to collect damages may be contractually limited.

Finally, the United States and other countries have imposed and may continue to impose new trade restrictions and export regulations, have levied tariffs and taxes on certain goods, including the potential for tariffs applicable to pharmaceutical products and their inputs. In September 2025, the United States administration announced plans to impose up to 100% tariffs on imported branded or patented pharmaceutical products, subject to certain exceptions. There is substantial uncertainty as to when such tariffs may go into effect and whether such tariffs would apply to the importation of registered starting materials, active pharmaceutical ingredients or bulk drug products that we use in our business, and, more generally, about the duration of existing tariffs, implementation of announced tariffs, litigation challenging tariffs and whether additional tariffs or other retaliatory measures may be imposed, modified or suspended. If additional tariffs, trade restrictions or other barriers are imposed or expanded, our costs for raw materials, active pharmaceutical ingredients, finished drug product or other inputs could increase materially, and our supply chain could be disrupted, which could materially adversely affect our business, financial condition and results of operations.

We may not be able to successfully manufacture our drugs or drug candidates in sufficient quality and quantity, which would delay or prevent us from developing our drug candidates and commercializing approved drug products.

Prior to the recent approval of MYQORZO in December 2025, our drug candidates had been manufactured in quantities adequate only for preclinical studies and early through late-stage clinical trials. In order to conduct large scale clinical trials for a drug candidate and for commercialization of the resulting drug if that drug candidate is approved for sale, such as for MYQORZO, we need to manufacture drugs in larger quantities and validate the repeatability of those manufacturing processes. We may not be able to successfully repeat or increase the manufacturing capacity for any of our drugs or drug candidates, in a timely or cost-effective manner or at all. Significant changes or scale-up of manufacturing may require additional validation studies, which are costly and which regulatory authorities must review and approve. In addition, quality issues may arise during those changes or scale-up activities because of the inherent properties of a drug or drug candidate itself or of a drug or drug candidate in combination with other components added during the manufacturing and packaging process, or during shipping and storage of the finished product or active pharmaceutical ingredients.

Our drug candidates and commercialized drugs, such as MYQORZO, require precise high-quality manufacturing. The failure to achieve and maintain high manufacturing standards in compliance with cGMP, including failure to document and detect, control, analyze and resolve anticipated or unanticipated manufacturing errors or the frequent occurrence of such errors, could result in patient injury or death, discontinuance or delay of ongoing or planned clinical trials, delays or failures in product testing or delivery or regulatory approval, cost overruns, product recalls or withdrawals and other problems that could seriously hurt our business. Contract drug manufacturers often encounter difficulties involving production yields, quality control and quality assurance and shortages of qualified personnel. These manufacturers are subject to stringent regulatory requirements, including cGMPs, regulations and similar foreign laws and standards. Each contract manufacturer must pass a pre-approval inspection before we can obtain marketing approval for any of our drug candidates and following approval will be subject to ongoing periodic unannounced inspections by the FDA, the U.S. Drug Enforcement Agency and other regulatory agencies, to ensure strict compliance with cGMPs and other applicable government regulations and corresponding foreign laws and standards. We seek, and require our contract manufacturers, to comply fully with all applicable regulations, laws and standards. However, we do not have control over our contract manufacturers’ compliance with these regulations, laws and standards. If one of our contract manufacturers fails to pass its pre-approval inspection or maintain ongoing compliance at any time, the production of our drugs or drug candidates could be interrupted, negatively impacting commercialization efforts for our approved drug products or resulting in delays or discontinuance of our clinical trials or refusal of regulatory approval for our drug candidates, leading to additional costs and potentially lost revenues. In addition, failure of any third-party manufacturers or us to comply with applicable regulations, including pre- or post-approval inspections and the cGMP requirements of the FDA or other comparable regulatory agencies, could result in sanctions being imposed on us. These sanctions could include fines, injunctions, civil penalties, failure of regulatory authorities to grant marketing approval of our products, delay, suspension or withdrawal of approvals, license revocation, product seizures or recalls, operational restrictions and criminal prosecutions, any of which could significantly and adversely affect our business.

Approved drug products remain subject to ongoing obligations, including continued regulatory review by the FDA and foreign regulatory agencies and REMS, all of which may result in significant expense and limit commercialization efforts of our drugs.

Any regulatory approvals that we or our partners receive for our drugs or drug candidates are subject to limitations on the indicated uses for which the drug may be marketed or require potentially costly post-marketing follow-up studies or compliance with a REMS program that includes ETASU. For example, MYQORZO is subject to a comprehensive REMS program that includes, among other things, restrictions and qualifications on pharmacies that dispense the drug and certification, record-keeping, ongoing monitoring and patient counseling obligations on physicians who prescribe the drug. In addition, in connection with the approval of MYQORZO the FDA requires the conduct of the following post-marketing studies: (i) a worldwide descriptive study that collects prospective and retrospective data in women exposed to MYQORZO during pregnancy to assess risks of pregnancy and maternal complications, and adverse effects on the developing fetus, the neonate, and the infant, as well as to assess infant outcomes through at least the first year of life and (ii) a milk-only lactation study in lactating women who have received MYQORZO to measure concentrations of MYQORZO in breast milk using a validated assay, as well as to assess the effects on the breastfed infant, if available, based on study population.

In addition, the labeling, packaging, adverse event reporting, storage, advertising, promotion and record-keeping for approved drugs remain subject to extensive regulatory requirements. The subsequent discovery of previously unknown problems with a drug, including adverse events of unanticipated severity or frequency, or the discovery that adverse events or toxicities observed in preclinical research or clinical trials that were believed to be minor constitute much more serious problems, may result in restrictions on the marketing of the drug or withdrawal of the drug from the market.

If the FDA or comparable foreign regulatory authorities approve generic versions of MYQORZO, or any other potential products that receive marketing approval, or such authorities do not grant MYQORZO appropriate periods of data or market exclusivity before approving a generic version, sales of MYQORZO could be adversely affected.

Once an NDA is approved, the drug covered thereby becomes a “reference-listed drug” in the FDA’s publication, “Approved Drug Products with Therapeutic Equivalence Evaluations.” Manufacturers may seek marketing approval of generic versions of reference-listed drugs through submission of Abbreviated New Drug Applications (“ANDAs”) in the United States. Generic drugs may be significantly less costly to bring to market than the reference-listed drug and companies that produce generic drugs are generally able to offer them at lower prices. Thus, following the introduction of a generic drug, a significant percentage of the sales of any branded product or reference-listed drug is typically lost to the generic drug.

The FDA may not approve an ANDA or a 505(b)(2) NDA for a generic drug until any applicable period of non-patent exclusivity for the reference-listed drug has expired. The FDCA provides a period of five years of non-patent exclusivity for a new drug containing a new chemical entity. During the exclusivity period, the FDA may not accept for review an ANDA or a 505(b)(2) NDA submitted by another company for another version of such product candidate where the applicant does not own or have a legal right of reference to all the data required for approval. However, an application may be submitted after four years if it contains a certification of patent invalidity or non-infringement. The FDCA also provides three years of marketing exclusivity for an NDA, 505(b)(2) NDA or supplement to an approved NDA if new clinical investigations, other than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for example, for new indications, dosages or strengths of an existing product candidate. This three-year exclusivity covers only the conditions associated with the new clinical investigations and does not prohibit the FDA from approving ANDAs for product candidates containing the original active agent for other conditions of use. Five-year and three-year exclusivity will not delay the submission or approval of a full NDA. However, an applicant submitting a full NDA would be required to conduct or obtain a right of reference to all of the nonclinical studies and adequate and well-controlled clinical trials necessary to demonstrate safety and effectiveness. Manufacturers may seek to launch generic drugs following the expiration of the marketing exclusivity period, even if we still have patent protection for such drugs.

Competition that MYQORZO, or any other potential product candidates, may face from generic drugs could materially and adversely impact our future revenue, profitability and cash flows and substantially limit our ability to obtain a return on the investments we have made in those products. Our future revenues, profitability and cash flows could also be materially and adversely affected and our ability to obtain a return on the investments we have made in MYQORZO or other product candidates may be substantially limited if MYQORZO, or any other potential products, product candidates, are not afforded the appropriate periods of non-patent exclusivity.

Risks Specific to our Company in connection with our Research and Development Activities

The regulatory approval and marketing authorization process is expensive, time-consuming and uncertain and may prevent our partners or us from obtaining approvals to commercialize some or all of our drug candidates.

The research, testing, manufacturing, selling and marketing of drugs are subject to extensive regulation by the FDA and other regulatory authorities in the United States and other countries. Neither we nor our partners are permitted to market our potential drugs in the United States until we receive approval of an NDA from the FDA. Obtaining NDA approval is a lengthy, expensive and uncertain process. The FDA and foreign regulatory agencies can delay, limit or deny approval of a drug candidate for many reasons, including, but not limited to, a determination that a drug candidate is not safe or effective, that the data from non-clinical testing and clinical trials is insufficient and that our partner’s or the contract manufacturer’s processes or facilities are not in compliance with GMP. Even if we receive regulatory approval to manufacture and sell a drug in a particular regulatory jurisdiction, other jurisdictions’ regulatory authorities may not approve that drug for manufacture and sale.

Regulatory approval of an NDA, NDA supplement or other marketing application for our drug candidates is never guaranteed. For example, our NDA for omecamtiv mecarbil for the treatment of HFrEF resulted in a complete response letter notwithstanding the fact that GALACTIC-HF met its primary efficacy endpoint. As our previously filed NDA for omecamtiv mecarbil illustrates, while we may submit marketing authorization applications for our drug candidates in the future, such applications may not lead to any regulatory approvals, or may result in requirements to conduct additional clinical trials prior to any potential approvals, which would increase our development costs and delay or preclude any revenue from commercial sales of our drug candidates.

Disruptions at the FDA, including due to a reduction in the FDA’s workforce and/or inadequate funding for the FDA, could prevent the FDA from performing normal functions on which our business relies, which could negatively impact our business.

The ability of the FDA to review and approve new products or review other regulatory submissions can be affected by a variety of factors, including statutory, regulatory and policy changes, inadequate government budget and funding levels, a reduction in the FDA’s workforce and its ability to hire and retain key personnel. Disruptions at the FDA and other agencies may also increase the time to meet with and receive agency feedback, review and/or approve our submissions, conduct inspections, issue regulatory guidance, or take other actions that facilitate the development, approval and marketing of regulated products, which would adversely affect our business. For example, over the last several years the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have had to furlough critical employees and stop critical activities. Most recently, during the U.S. government shut down in October 2025, the FDA was not able to accept applications for new drugs, generics, biologics, biosimilars or medical devices that require payment of a user fee. In addition, government proposals to reduce or eliminate budgetary deficits may include reduced allocations to the FDA and other related government agencies. For example, the current United States administration established the now-disbanded Department of Government Efficiency, which implemented a federal government hiring freeze and announced certain additional efforts to reduce federal government employee headcount, including by eliminating 3,500 employees from the FDA, and the size of the federal government. The reductions in the FDA’s workforce and budgetary pressures could significantly impact the ability of the FDA to timely review and process our regulatory submissions or take other actions critical to the marketing of any of our product candidates that are ultimately approved. Any delay in the acceptance, review or approval of our investigational new drug applications, clinical trial applications, marketing applications, facility inspections or lot-release/testing activities could delay or increase the cost of our clinical trials, manufacturing scale-up, product launches or post-approval changes, which could have a material adverse effect on our business.

Clinical trials could fail to demonstrate the desired safety and efficacy of our drug candidates, which could prevent or significantly delay completion of clinical development and regulatory approval.

Prior to receiving approval to commercialize any of our drug candidates, we or our partners must adequately demonstrate to the satisfaction of FDA and foreign regulatory authorities that the drug candidate is sufficiently safe and effective with substantial evidence from well-controlled clinical trials. We or our partners must demonstrate efficacy in clinical trials for the treatment of specific indications and monitor safety throughout the clinical development process and following approval. Although our NDA for MYQORZO was approved in December 2025, we have failed in the past to meet the burdens for efficacy and safety required by FDA and other regulatory authorities. For example, the CRL we received in February 2023 in connection with our NDA for omecamtiv mecarbil stated that the results of GALACTIC-HF were not sufficiently persuasive to establish substantial evidence of effectiveness for reducing the risk of heart failure events and cardiovascular death in adults with chronic heart failure with HFrEF, and in March 2023, we announced the discontinuation of COURAGE-ALS, our Phase 3 clinical trial of reldesemtiv in patients with ALS, due to futility. If we fail to demonstrate that our drugs are safe and efficacious, we may incur additional development costs and be precluded from realizing commercial sales for our drug candidates.

Drug candidates that have similar mechanisms of actions to ours have been subject to clinical trials that have failed to meet their primary endpoints. For example, Camzyos® (mavacamten), a small molecule myosin inhibitor commercialized by Bristol-Myers Squibb Company has a similar mechanism of action to aficamten and failed to meet its dual primary endpoints in ODYSSEY-HCM, a Phase 3 clinical trial assessing its efficacy for the treatment of nHCM. Although such result is not dispositive on the eventual results of our clinical trial of aficamten in nHCM, ACACIA-HCM, the results of ODYSSEY-HCM may suggest that a myosin inhibitor is not effective for the treatment of nHCM notwithstanding the positive results in clinical trials of such drugs in oHCM. In addition, the nHCM patient population presents distinct physiological differences from the oHCM population and those differences may require different dosing strategies to achieve a functional benefit, if at all. As compared to our oHCM trials, this difference in disease pathology and dosing strategy, among other things, could result in a different magnitude of functional benefit, if any, in ACACIA-HCM; it could also result in more treatment interruptions or it could alter the safety profile of aficamten observed in ACACIA-HCM. In the event such differences in functional benefit are observed, regulatory agencies may not approve the nHCM indication or such regulatory approvals may be delayed.

The regulatory pathway for approval also depends on the totality of clinical data and regulatory agencies’ interpretations of what constitutes a minimally important clinical difference in these functional endpoints, which can be subjective because there is no universally established standard. There are a wide range of possible outcomes (e.g., positive, negative or mixed) for the results of ACACIA-HCM, including that we do not demonstrate either a magnitude of functional benefit that regulators deem satisfactory for approval or a magnitude of functional benefit that physicians deem sufficient to prescribe MYQORZO for their patients. In such cases, regulatory agencies may not approve the nHCM indication or may delay such approval, or physicians may not prescribe MYQORZO for their patients, respectively.

Our failure to demonstrate that our drugs are safe and efficacious can result in additional development costs and preclude us from realizing commercial sales for our drug candidates.

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

The timely completion of clinical trials in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the trial until its conclusion. We may experience difficulties in patient enrollment in clinical trials for a variety of reasons, including, but not limited to, the existence of approved therapies and the concurrent enrollment of clinical trials for competing therapies. The enrollment of patients depends on many factors, including: the patient eligibility criteria defined in the protocol; the size of the patient population required for analysis of the trial’s primary endpoints; the proximity of patients to study sites; the design of the trial; the ability to recruit clinical trial investigators with the appropriate competencies and experience; clinicians’ and patients’ perceptions as to the potential advantages of the product candidate being studied in relation to other available therapies or clinical trials being conducted by our competitors; the ability to obtain and maintain patient consents; the risk that patients enrolled in clinical trials will drop out of the trials before completion. Delays in patient enrollment may result in increased costs or may affect the timing or outcome of the planned clinical trials, which could prevent completion of these trials and adversely affect our and our partners’ ability to advance the development of product candidates.

The failure to successfully develop, manufacture and obtain regulatory clearance or approval of an immunoassay or companion diagnostics, if required by FDA as a condition to approval of our drugs, could harm our development and commercialization strategy for such drugs in key markets.

In connection with the anticipation of filing of a new NDA and MAA for omecamtiv mecarbil at the conclusion of COMET-HF, FDA and/or EMA may require that patients treated with omecamtiv mecarbil have their blood monitored during titration for concentrations of the drug in order to determine optimized dosing that maximizes benefits without undue risk. We have contracted with Microgenics Corporation, a subsidiary of Thermo Fisher, to develop and eventually commercialize an antibody-based immunoassay for blood concentrations of omecamtiv mecarbil. The development, manufacture and regulatory approval of an antibody-based immunoassay, however, can be complex and/or time consuming. Such an immunoassay could require regulatory clearance by FDA as a companion diagnostic device or similar regulatory clearance by EMA, and there is no assurance that such regulatory clearance will be obtained. In addition, if required by FDA and/or EMA as part of any approved label for omecamtiv mecarbil, we will be dependent on Microgenics Corporation to successfully manufacture and commercialize its immunoassay in sufficient quantities in all key markets in which we may seek to commercialize omecamtiv mecarbil, failing which, our potential sales of omecamtiv mecarbil could be materially adversely affected.

We depend on CROs to conduct our clinical trials and we have limited control over their performance. If these CROs do not successfully carry out their contractual duties or meet expected deadlines, or if we lose any of our CROs, we may not be able to obtain regulatory approval for or commercialize our product candidates on a timely basis, if at all.

We have used and intend to continue to use a limited number of CROs within and outside of the United States to conduct clinical trials of our drug candidates and related activities. We do not have control over many aspects of our CROs’ activities, and cannot fully control the amount, timing or quality of resources that they devote to our programs. CROs may not assign as high a priority to our programs or pursue them as diligently as we would if we were undertaking these programs ourselves. The activities conducted by our CROs therefore may not be completed on schedule or in a satisfactory manner. CROs may also give higher priority to relationships with our competitors and potential competitors than to their relationships with us. Outside of the United States, we are particularly dependent on our CROs’ expertise in communicating with clinical trial sites and regulatory authorities and ensuring that our clinical trials and related activities and regulatory filings comply with applicable laws.

Although we rely, and will continue to rely, on these third parties to conduct our clinical trials, we remain responsible for our studies and clinical trials being conducted in accordance with the applicable protocol, legal, regulatory and scientific standards and our reliance on third parties does not relieve us of our regulatory responsibilities. We, and these third parties are required to comply with cGCPs for clinical studies. cGCPs are regulations and guidelines enforced by the FDA, EMA and comparable foreign regulatory authorities for all of our products in clinical development. Regulatory authorities enforce cGCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of our third-party contractors fail to comply with applicable regulatory requirements, including cGCPs, the clinical data generated in our clinical trials may be deemed unreliable and FDA, EMA, or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. There can be no assurance that upon inspection by a given regulatory authority, such regulatory authority will determine that any of our clinical trials comply with cGCP regulations. In addition, our clinical trials must be conducted with product produced under cGMP regulations. Our failure to comply with these regulations may require us to repeat clinical trials, which could add additional costs and could delay the regulatory approval process.

Risks Specific to our Company in connection with our Intellectual Property

Our success depends substantially upon our ability to obtain and maintain intellectual property protection relating to our drug candidates, compounds and research technologies.

We own, co-own or hold exclusive licenses to a number of U.S. and foreign patents and patent applications directed to our drug candidates, compounds and research technologies. Our success depends on our ability to obtain patent protection both in the United States and in other countries for our drug candidates, their methods of manufacture and use, and our technologies. Our ability to protect our drugs and drug candidates, and compounds and technologies from unauthorized or infringing use by third parties depends substantially on our ability to obtain and enforce our patents. If our issued patents and patent applications, if granted, do not adequately describe, enable or otherwise provide coverage for our technologies and drugs and drug candidates, we, our licensors or our licensees would not be able to exclude others from developing or commercializing these drugs or drug candidates. Furthermore, the degree of future protection of our proprietary rights is uncertain because legal means may not adequately protect our rights or permit us to gain or keep our competitive advantage. If we are unable to obtain and maintain sufficient intellectual property protection for our technologies and drugs or drug candidates, or if the scope of the intellectual property protection obtained is not sufficiently broad, our competitors could develop and commercialize drugs similar or identical to ours, and our ability to successfully commercialize product candidates that we may pursue may be impaired.

We may not be able to protect our intellectual property rights throughout the world. Patent protection is afforded on a country-by-country basis. In addition, our patents in foreign jurisdictions may be subject to opposition proceedings that challenge the validity of our patents. For example, our composition of matter and a crystalline form patent for aficamten are subject to oppositions in the EU. If we were to lose these proceedings and suffer patent invalidity, our commercial prospects for aficamten in the EU may, absent the continued effectiveness of our other patents in the EU, including our composition of matter patent in the EU, be adversely affected. Moreover, we may not seek patent protection in all jurisdictions throughout the world. Filing, prosecuting and defending patents on our products or product candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. Many companies have encountered significant difficulties in protecting and defending intellectual property rights in foreign jurisdictions. In addition, the legal protection afforded to inventors and owners of intellectual property in countries outside of the United States may not be as protective of intellectual property rights as in the United States. Therefore, we may be unable to acquire and protect intellectual property developed by these contractors to the same extent as if these development activities were being conducted in the United States. If we encounter difficulties in protecting our intellectual property rights in foreign jurisdictions, our business prospects could be substantially harmed.

Patent terms may be inadequate to protect our competitive position on our technologies, drugs and drug candidates for an adequate amount of time. Patents have a limited lifespan. In the United States, if all maintenance fees are timely paid, the natural expiration of a patent is generally 20 years from its earliest U.S. non-provisional filing date. Various extensions may be available, but the life of a patent, and the protection it affords, is limited. Even if patents covering our technologies, drugs and drug candidates are obtained, once the patent life has expired, we may be open to competition from competitive products, including generics. Given the amount of time required for the development, testing and regulatory review of new drugs and drug candidates, patents protecting such candidates might expire before or shortly after such drugs or drug candidates are commercialized. As a result, our owned, co-owned and licensed patent portfolio may not provide us with sufficient rights to exclude others from commercializing products similar or identical to ours or our partners.

If we are unable to protect the confidentiality of our trade secrets, the value of our technology could be materially adversely affected and our business would be harmed, and we may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential information of third parties or that we or our employees have wrongfully used or disclosed trade secrets of their former employers.

We rely on trade secrets to protect our technology, particularly where we believe patent protection is not appropriate or obtainable. However, trade secrets are often difficult to protect, especially outside of the United States. While we endeavor to use reasonable efforts to protect our trade secrets, our or our partners’ employees, consultants, contractors or scientific and other advisors may unintentionally or willfully disclose our information to competitors. In addition, confidentiality agreements, if any, executed by those individuals may not be enforceable or provide meaningful protection for our trade secrets or other proprietary information in the event of unauthorized use or disclosure. We cannot be certain that such agreements have been entered into with all relevant parties, and we cannot be certain that our trade secrets and other confidential proprietary information will not be disclosed or that competitors will not otherwise gain access to our trade secrets or independently develop substantially equivalent information and techniques. Pursuing a claim that a third party had illegally obtained and was using our trade secrets would be expensive and time-consuming, and the outcome would be unpredictable. Even if we are able to maintain our trade secrets as confidential, if our competitors lawfully obtain or independently develop information equivalent or similar to our trade secrets, our business could be harmed.

Additionally, many of our employees were previously employed at universities or other biotechnology or pharmaceutical companies, including our competitors or potential competitors. Although no legal proceedings against us are currently pending, we may be subject to claims that these employees or we have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers. Litigation may be necessary to defend against these claims. If we fail in defending these claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel. A loss of key research personnel or their work product could hamper or prevent our ability to develop and commercialize certain potential drugs, which could significantly harm our business. Even if we are successful in defending against these claims, litigation could result in substantial costs and distract management.

Infringement lawsuits are costly and time-consuming, and an unfavorable outcome could have a significant adverse effect on our business, including our ability to market MYQORZO to the fullest extent permissible within regulatory approvals.

Our ability to commercialize drugs depends on our ability to use, manufacture and sell those drugs without infringing the patents or other proprietary rights of third parties. Numerous U.S. and foreign issued patents and pending patent applications owned by third parties exist in the therapeutic areas in which we are developing drug candidates or seeking new potential drug candidates, while others may exist that claim methods of use of our existing drugs. For example, we are aware of the existence of a patent application relating to cardiac myosin inhibitors for which a notice of allowance has been issued by the U.S. Patent and Trademark Office. Once a notice of allowance has been issued, there are typically no further substantive hurdles to patent issuance and the only remaining administrative step to be conducted by the assignee is the payment of the USPTO’s issue fee within the 3-month deadline to pay the issue fee. If a patent is issued with respect to this application, the patent holder may assert that patent claims cover certain aspects of treating patients with HCM. Such claims could result in patent litigation, injunctive relief and/or damages if we are found to be infringing.

In addition, third parties may infringe our patents. To prevent infringement or unauthorized use, we may need to file infringement suits, which are expensive and time-consuming. In an infringement proceeding, a court may decide that one or more of our patents is invalid, unenforceable, or both. In such case third parties may be able to use our technology without paying licensing fees or royalties. Even if the validity of our patents is upheld, a court may refuse to stop the other party from using the technology at issue on the ground that the other party’s activities are not covered by our patents. Policing unauthorized use of our intellectual property is difficult, and we may not be able to prevent misappropriation of our proprietary rights, particularly in countries where the laws may not protect such rights as fully as in the United States. In addition, third parties may affirmatively challenge the scope or validity of our patent rights.

Financial Risks

We have a history of significant losses and may not achieve or sustain profitability and, as a result, you may lose part or all of your investment.

We have incurred operating losses in each year since our inception in 1997, due to costs incurred in connection with our research and development activities and general and administrative costs associated with our operations. We have only recently commenced commercialization activities with the approval of MYQORZO in December 2025. Our other drug candidates are all in early through late-stage clinical testing. We expect to incur losses, as we continue our research activities and conduct development of, and seek regulatory approvals for, our other drug candidates, and begin our commercialization efforts on MYQORZO. If our other drug candidates fail or do not gain regulatory approval, or if MYQORZO or our other drug candidates do not achieve market acceptance, we will not be profitable. If we fail to become and remain profitable, or if we are unable to fund our continuing losses, you could lose part or all of your investment.

We will need substantial additional capital in the future to sufficiently fund and maintain our operations.

We have consumed substantial amounts of capital to date, and our operating expenditures will increase as we expand our research and development activities and expand our organization to commercialize MYQORZO. We have historically funded our operations and capital expenditures with proceeds primarily from private and public sales of our equity securities, royalty monetization agreements, revenue interest agreements, strategic alliances, long-term debt, other financings, interest on investments and grants but will be increasingly relying on revenues generated from the commercial sales of MYQORZO to fund our operations and cash expenditures. We believe our existing cash and cash equivalents, short-term investments and interest earned on investments should be sufficient to meet our projected operating requirements for at least the next 12 months. We based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect. Because of the numerous risks and uncertainties associated with the development of our drug candidates and other research and development activities, including risks and uncertainties that could impact the rate of progress of our development activities, we are unable to estimate with certainty the amounts of capital outlays and operating expenditures associated with these activities.

For the foreseeable future, our operations will require significant additional funding, in large part due to our research and development expenses, the organizational scale up and associated expenditures with the commercialization of MYQORZO, combined with the absence of any revenues until first quarter 2026. Until we can generate a sufficient amount of product revenue, we expect to raise future capital through strategic alliance and licensing arrangements, public or private equity offerings and debt financings. We do not have any commitments for future funding other than through loans under the RP Multi Tranche Loan Agreement and reimbursements, milestone and royalty payments that we may receive under our agreements with Sanofi and Bayer. We may not receive any further funds under any of these agreements, for example, if we fail to satisfy the conditions for future loan disbursement or as a result of the default or insolvency of our lenders. Our ability to raise funds may be adversely impacted by worsening economic conditions or disruptions to, and volatility in, the credit and financial markets in the U.S. and worldwide, including due to general economic uncertainty, geopolitical conditions, armed conflict and hostilities, interest rate volatility, inflationary pressures, including those resulting from tariffs and escalating trade tensions, and other factors outside of our control. As a result of these and other factors, we do not know whether additional financing will be available when needed, or that, if available, such financing would be on terms favorable to our stockholders or us, and if we cannot raise the funds we need to operate our business, we will need to delay or discontinue certain research and development activities, and our stock price may be negatively affected.

Our indebtedness and liabilities could limit the cash flow available for our operations, expose us to risks that could adversely affect our business, financial condition and results of operations and impair our ability to satisfy our obligations under the Convertible Notes, the RP Multi Tranche Loan Agreement and the RP OM Loan Agreement.

As of December 31, 2025 and 2024 we had $1.3 billion and $0.8 billion of debt recorded on the balance sheet comprised of the Term loans (including related derivative measured at fair value), Liabilities related to RPI Transactions measured at fair value, and the Convertible Notes, respectively. Additionally we have liabilities related to revenue participation right purchase agreements of $520.6 million and $462.2 million at December 31, 2025 and 2024, respectively.

We may also incur additional indebtedness to meet future financing needs. Our indebtedness could have significant negative consequences for our security holders and our business, results of operations and financial condition by, among other things: increasing our vulnerability to adverse economic and industry conditions; limiting our ability to obtain additional financing; requiring the dedication of a substantial portion of our cash flow from operations to service our indebtedness, which will reduce the amount of cash available for other purposes; limiting our flexibility to plan for, or react to, changes in our business; diluting the interests of our existing stockholders as a result of issuing shares of our common stock upon conversion of the Convertible Notes; and placing us at a possible competitive disadvantage with competitors that are less leveraged than us or have better access to capital.

Our business may not generate sufficient funds, and we may otherwise be unable to maintain sufficient cash reserves, to pay amounts due under our indebtedness and our cash needs may increase in the future. In addition, any required repurchase of the Convertible Notes for cash as a result of a Fundamental Change would lower our current cash on hand such that we would not have those funds available for us in our business. Further any future indebtedness that we may incur may contain financial and other restrictive covenants that limit our ability to operate our business, raise capital or make payments under our other indebtedness. If we fail to comply with these covenants or to make payments under our indebtedness when due, then we would be in default under that indebtedness, which could, in turn, result in that and our other indebtedness becoming immediately payable in full.

Covenants in the RP Multi Tranche Loan Agreement, the RP OM Loan Agreement, the RP Ulacamten RPA, the RP Aficamten RPA, the RP OM RPA, and the indentures related to our Convertible Notes restrict our business and operations in many ways and if we do not effectively manage our covenants, our financial conditions and results of operations could be adversely affected.

The RP Multi Tranche Loan Agreement, the RP OM Loan Agreement, the RP Ulacamten RPA, the RP Aficamten RPA, the RP OM RPA, and the indentures related to the Convertible Notes require that we comply with certain covenants, including among other things, covenants restricting dispositions, changes in business, management, ownership or business locations, mergers or acquisitions, indebtedness, encumbrances, distributions, investments, transactions with affiliates and subordinated debt, any of which could restrict our business and operations, particularly our ability to respond to changes in our business or to take specified actions to take advantage of certain business opportunities that may be presented to us. In addition, the RP Ulacamten RPA, the RP Aficamten RPA and the RP OM RPA contain certain covenants applicable to us, including among other things, development and commercialization diligence obligations in connection to MYQORZO, omecamtiv mecarbil and ulacamten and reporting obligations, which could also restrict our business and operations, particularly in connection to our development and commercialization of MYQORZO, omecamtiv mecarbil and ulacamten.

Our failure to comply with any of the covenants could result in a default under the RP Multi Tranche Loan Agreement, the RP OM Loan Agreement, the RP Ulacamten RPA, the RP Aficamten RPA, the RP OM RPA, or the indentures related to the Convertible Notes, which could permit the counterparties to declare all or part of any outstanding borrowings or other payment obligations to be immediately due and payable and/or enforce any outstanding liens against our assets.

We have no rights to repurchase the revenue interests in drug products containing aficamten, omecamtiv mecarbil, or ulacamten (other than, in respect of ulacamten only, in connection with a change of control of Cytokinetics) sold to affiliates of Royalty Pharma, thereby limiting our ability to eliminate future applicability of the covenants contained in the RP Ulacamten RPA, the RP OM RPA and the RP Aficamten RPA, and although we have voluntary prepayment rights under the RP Multi Tranche Loan Agreement and the RP OM Loan Agreement, any voluntary prepayment rights under the RP Multi Tranche Loan Agreement require that we pay 190% of the principal amount of amounts disbursed to us as tranche 1, tranche 4, tranche 5, tranche 6, and tranche 7 loans, thereby making it potentially disadvantageous to voluntarily prepay RPDF prior to the final maturity date applicable to loans outstanding under the RP Multi Tranche Loan Agreement.

Finally, should we be unable to comply with our covenants or if we default on any portion of our outstanding borrowings under the RP Multi Tranche Loan Agreement or the RP OM Loan Agreement, in addition to its rights to accelerate and demand for immediate repayment of amounts outstanding under the RP Multi Tranche Loan Agreement, we would be liable for default interest at a rate of 4% over the prime rate.

Conversion of our outstanding Convertible Notes may result in the dilution of existing stockholders, create downward pressure on the price of our common stock, and restrict our ability to take advantage of future opportunities.

The Convertible Notes may be converted into cash and/or shares of our common stock (subject to our right or obligation to pay cash in lieu of all or a portion of such shares). If shares of our common stock are issued to the holders of the Convertible Notes upon conversion, there will be dilution to our stockholders’ equity, and the market price of our shares may decrease due to the additional selling pressure in the market. Any downward pressure on the price of our common stock caused by the sale or potential sale of shares issuable upon conversion of the Convertible Notes could also encourage short sales by third parties, creating additional selling pressure on our stock. The existence of the Convertible Notes and the obligations that we incurred by issuing them may restrict our ability to take advantage of certain future opportunities, such as engaging in future debt or equity financing activities.

We will depend on Sanofi for the development and commercialization of aficamten in China and Bayer for the development and commercialization of aficamten in Japan.

Under the terms of our license and collaboration agreements, Sanofi is responsible for the development and commercialization of aficamten (to be commercialized as MYQORZO) in China and Bayer is responsible for the development and commercialization of aficamten in Japan. The timing and amount of any milestone and royalty payments we may receive under our license and collaboration agreements from Sanofi and Bayer will depend in part on the efforts and successful commercialization of aficamten by our out-license partners. We do not control the individual efforts of out-license partners, and any failure by our partners to devote sufficient time and effort to the development and commercialization of aficamten or to meet their respective obligations to us, including for future milestone and royalty payments; or to satisfactorily resolve significant disagreements with us could each have an adverse impact on our financial results and operations. We depend on our partners to comply with all applicable local laws relative to the development and commercialization of aficamten. If our partners violate, or are alleged to have violated, any laws or regulations during the performance of its obligations for us, it is possible that we could suffer financial and reputational harm or other negative outcomes, including possible legal consequences.

Any termination, breach or expiration of any of the license and collaboration agreements with Sanofi and Bayer could have a material adverse effect on our financial position by reducing or eliminating the potential for us to receive milestones and royalties. In such an event, we may be required to devote additional efforts and to incur additional costs associated with pursuing the development and commercialization of aficamten in China or Japan. Alternatively, we may attempt to identify and transact with a new licensee, but there can be no assurance that we would be able to identify a suitable licensee or transact on terms that are favorable to us.

Our ability to use net operating loss carryforwards and tax credit carryforwards to offset future taxable income may be subject to certain limitations, and ownership changes may limit our ability to use our net operating losses and tax credits in the future.

Our ability to use our federal and state NOLs to offset potential future taxable income and reduce related income taxes depends upon our generation of future taxable income. We cannot predict with certainty when, or whether, we will generate sufficient taxable income to use our NOLs. Under the Internal Revenue Code and similar state provisions, certain substantial changes in our ownership could result in an annual limitation on the amount of net operating loss and credit carryforwards that can be utilized in future years to offset future taxable income. The annual limitation may result in the expiration of net operating losses and credit carryforwards before utilization. We completed a Section 382 analysis through December 31, 2025, and concluded that an ownership change, as defined under Section 382, had not occurred

Any material limitation or expiration of our NOLs and tax credit carryforwards may harm our future net income by effectively increasing our future effective tax rate, which could result in a reduction in the market price of our common stock.

Legal and Compliance Risks

Legislation, such as the Inflation Reduction Act, or IRA, and the One Big Beautiful Bill Act, or OBBA, and potential future legislation may increase the difficulty and cost for us to obtain regulatory approval of, and to commercialize our products and to obtain Medicare coverage by 3rd party plans and affect the prices we may obtain upon commercialization.

The regulations that govern, among other things, regulatory approvals, coverage, pricing and reimbursement for new drug products vary widely from country to country. In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay regulatory approval of our product candidates, restrict or regulate post-approval activities and affect our ability to successfully sell MYQORZO or any other drug candidates for which we obtain regulatory approval.

For example, in August 2022, the Inflation Reduction Act, or IRA, was signed into law, which, among other things, includes prescription drug provisions that may impact product pricing including the potential for net price reductions and/or the ability to increase price beyond the level of inflation over the lifecycle of our products, and/or may increase our rebate obligation to Medicare. The IRA implements inflation rebates in Medicare when a drug’s Average Manufacturer Price (AMP, in Part D) or Average Sale Price (ASP, in Part B) rises faster than the inflation index (CPI-U). In addition, the Part D drug benefit caps beneficiary spending at $2,000, eliminates the coverage gap for patients, and modifies, beginning in 2025, liabilities for drug manufacturers by replacing the 70% discount in the Coverage gap with a 10% discount in the Initial Coverage phase and a 20% discount in the Catastrophic phase. The IRA may also impact our ability to achieve broad coverage of our products by Medicare Plans as the IRA reduces the government’s and beneficiaries’ liability for drug spending while shifting costs to health plans and drug manufacturers. The IRA permits HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years. In addition, an executive order issued by the White House on May 12, 2025, [directs the Department of Health and Human Services ("HHS") to implement a “Most Favored Nation” drug pricing policy], and the recently-enacted One Big Beautiful Bill Act imposes new restrictions on funding for government health care programs and on individual eligibility for coverage under those programs, which may lead to lower reimbursements for drugs covered by those programs. More recently, HHS has begun announcing new drug payment models to lower drug prices for government health care program beneficiaries, such as the GUARD and GENEROUS models announced by the agency in late 2025. These models would use the prices other countries pay for drugs as benchmarks for determining whether manufacturers are required to offer additional rebates.

We cannot be sure whether additional legislation or rulemaking related to these developments will be issued or enacted, or what impact, if any, such changes will have on the profitability of MYQORZO, or any of our drug candidates, if approved for commercial use, in the future.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at broadening the availability of healthcare and containing or lowering the cost of healthcare. However, we cannot predict the timing or substance of proposals that may be adopted in the future, particularly in light of the difficulty of advancing legislation through Congress. The continuing efforts of governments, insurance companies, managed care organizations and other payors of healthcare services to contain or reduce costs of healthcare, including by imposing price controls, may adversely affect the demand and/or potential sales for MYQORZO and our product candidates for which we obtain regulatory approval and our ability to set a price that we believe is fair for our products. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors.

We cannot predict the likelihood, nature, or extent of health reform initiatives that may arise from future legislation or administrative action and cannot predict the effect of any of such initiatives on our future financial results or the value of our common stock.

Our relationships with customers, healthcare providers, clinical trial sites and professionals and third-party payors will be subject to applicable anti-kickback, fraud and abuse and other laws and regulations. If we fail to comply with federal, state and foreign laws and regulations, including healthcare, privacy and data security laws and regulations, we could face criminal sanctions, civil penalties, contractual damages, reputational harm and diminished profits and future earnings.

Healthcare providers, including physicians and third-party payors play a primary role in the recommendation and prescription of any drug candidates for which we may obtain marketing approval. Our arrangements with customers, healthcare providers and third-party payors anywhere in the world may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we develop, and may market, sell and distribute, our products for which we obtain marketing approval.

Activities to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations will involve substantial costs. It is possible that government authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, exclusion from government funded healthcare programs, such as Medicare and Medicaid in the United States, and the curtailment or restructuring of our operations. Exclusion, suspension and debarment from government funded healthcare programs would significantly impact our ability to commercialize, sell or distribute any drug. If any of the physicians or other providers or entities with whom we expect to do business are found to be not in compliance with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs.

We may be subject to costly product liability or other liability claims and may not be able to obtain adequate insurance.

The use of our drugs and drug candidates in clinical trials or by commercial patients may result in adverse events. We cannot predict all the possible harms or adverse events that may result from our clinical trials. We cannot predict all the possible harms or adverse events that may result from our clinical trials or the commercial use of any commercial products that may be approved in the future. We currently maintain limited product liability insurance, but such insurance may not be sufficient to cover any damages for which we may become liable, and we may be unable to continue to obtain such insurance on acceptable terms with adequate coverage, or at reasonable costs. Beyond insurance, we may not have sufficient resources to pay for any liabilities resulting from a personal injury or other claim.

We are subject to laws and regulations relating to privacy, data protection and the collection and processing of personal data. Failure to maintain compliance with these regulations could create additional liabilities for us.

The legislative and regulatory landscape for privacy and data protection continues to evolve in the U.S. and other jurisdictions around the world. For example, the California Consumer Privacy Act ("CCPA") affords California residents expanded privacy rights and protections, including civil penalties for violations and statutory damages under a private right of action for data security breaches. These protections were expanded by the California Privacy Rights Act ("CPRA") with the CPRA’s implementing regulations currently subject to a stay of enforcement until one year from their issuance. Privacy laws in other states may also impact our operations, including both comprehensive and sector-specific legislation, and Congress is also considering additional federal privacy legislation. In addition, most healthcare professionals and facilities are subject to privacy and security requirements under HIPAA with respect to our clinical and commercial activities. Although we are not considered to be a covered entity or business associate under HIPAA, we could be subject to penalties if we use or disclose individually identifiable health information in a manner not authorized or permitted by HIPAA. Other countries also have, or are developing, laws governing the collection, use and transmission of personal information. For example, in the EU, the GDPR regulates the processing of personal data of individuals within the EU, even if, under certain circumstances, that processing occurs outside the EU, and also places restrictions on transfers of such data to countries outside of the EU, including the U.S. Should we fail to provide adequate privacy or data security protections or maintain compliance with these laws and regulations, including the CCPA, as amended by the CPRA, as well as the GDPR, we could be subject to sanctions or other penalties, litigation, an increase in our cost of doing business and questions concerning the validity of our data processing activities, including clinical trials.

Responding to any claims relating to improper handling, storage or disposal of the hazardous chemicals and radioactive and biological materials we use in our business could be time-consuming and costly.

Our research and development processes involve the controlled use of hazardous materials, including chemicals and radioactive and biological materials. Our operations produce hazardous waste products. We cannot eliminate the risk of accidental contamination or discharge and any resultant injury from those materials. Federal, state and local laws and regulations govern the use, manufacture, storage, handling and disposal of hazardous materials. We may be sued for any injury or contamination that results from our or third parties’ use of these materials. Compliance with environmental laws and regulations is expensive, and current or future environmental regulations may impair our research, development and production activities.

Litigation may substantially increase our costs and harm our business.

We have been, and may in the future become, party to lawsuits including, without limitation, actions, claims and proceedings in the ordinary course of business relating to our directors, officers, stockholders, intellectual property, and employment matters and policies, which will cause us to incur legal fees and other costs related thereto, including potential expenses for the reimbursement of legal fees of officers and directors under indemnification obligations. The expense of defending against such claims or litigation may be significant and there can be no assurance that we will be successful in any defense. Further, the amount of time that may be required to resolve such claims or lawsuits is unpredictable, and these actions may divert management’s attention from the day-to-day operations of our business, which could adversely affect our business, results of operations, and cash flows. Litigation is subject to inherent uncertainties, and an adverse result in such matters that may arise from time to time could have a material adverse effect on our business, results of operations, and financial condition.

General Risk Factors

Our failure to attract and retain skilled personnel could impair our drug development, commercialization and financial reporting activities.

Our business depends on the performance of our senior management and key scientific, commercial and technical personnel. The loss of the services of any member of our senior management or key scientific, technical, commercial or financial reporting staff may significantly delay or prevent the achievement of drug development and other business objectives by diverting management’s attention to transition matters and identifying suitable replacements. We also rely on consultants and advisors to assist us in formulating our research and development strategy. All of our consultants and advisors are either self-employed or employed by other organizations, and they may have conflicts of interest or other commitments, such as consulting or advisory contracts with other organizations, that may affect their ability to contribute to us. In addition, if and as our business grows, we will need to recruit additional executive management and scientific, technical and financial reporting personnel, particularly in Europe, where we need to build the corporate and commercial infrastructure, including identification and recruitment of qualified personnel to enable commercial operations by the time of a potential EMA approval of one of our drug candidates. There is intense competition for skilled executives and employees with relevant scientific and technical expertise, and this competition is likely to continue. Our inability to attract and retain sufficient scientific, technical, commercial and managerial personnel could limit or delay our product development or commercialization activities, which would adversely affect the development of our drug candidates and commercialization of our potential drugs and growth of our business.

Significant disruptions of information technology systems or breaches of data security could adversely affect our business.

Our business is increasingly dependent on complex and interdependent information technology systems, including internet-based systems, databases and programs, to support our business processes as well as internal and external communications. Despite the implementation of security measures, our internal computer systems and those of our third-party CROs, CMOs, supply chain partners, collaboration partners and other contractors and consultants are vulnerable to damage from computer viruses, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. As use of information technology systems has increased, deliberate attacks and attempts to gain unauthorized access to computer systems and networks have increased in frequency and sophistication. Furthermore, cybersecurity incidents increasingly involve the use of artificial intelligence and machine learning to launch more automated, targeted and coordinated attacks. Our information technology, systems and networks are potentially vulnerable to breakdown, malicious intrusion and computer viruses which may result in the impairment of production and key business processes or loss of data or information. We are also potentially vulnerable to data security breaches—whether by employees or others—which may expose sensitive data to unauthorized persons. We have in the past and may in the future be subject to security breaches. In December 2019, our IT systems were exposed to a ransomware attack, which partially impaired certain IT systems for a short period of time. Although we do not believe that we have experienced any material losses related to security breaches, including in recent email “phishing” incidents or the ransomware attack, there can be no assurance that we will not suffer such losses in the future. Breaches and other inappropriate access can be difficult to detect and any delay in identifying them could increase their harm, and it may take considerable time for us to investigate and evaluate the full impact of cyberattacks, particularly for sophisticated attacks, which may inhibit our ability to provide prompt, full, and reliable information about cybersecurity incidents to our customers, regulators, and the public. While we have implemented measures to protect our data security and information technology systems, such measures may not prevent these events. Any such breaches of security and inappropriate access could disrupt our operations, harm our reputation or otherwise have a material adverse effect on our business, financial condition and results of operations. For example, the loss of clinical study data from completed or ongoing clinical studies for any of our drug candidates could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. In addition, our liability insurance, which includes cyber insurance, might not be sufficient in type or amount to cover us against claims related to cybersecurity incidents, attacks and other related incidents.

Our facilities in California are located near an earthquake fault, and an earthquake or other types of natural disasters, catastrophic events or resource shortages could disrupt our operations and adversely affect our results.

All our facilities and our important documents and records, such as hard and electronic copies of our laboratory books and records for our drug candidates and compounds and our electronic business records, are located in our corporate headquarters at a single location in South San Francisco, California near active earthquake zones. If a natural disaster, such as an earthquake, fire or flood, a catastrophic event such as a disease pandemic or terrorist attack, or a localized extended outage of critical utilities or transportation systems occurs, we could experience a significant business interruption. Our partners and other third parties on which we rely may also be subject to business interruptions from such events. In addition, California from time to time has experienced shortages of water, electric power and natural gas. Future shortages and conservation measures could disrupt our operations and cause expense, thus adversely affecting our business and financial results.

We expect that our stock price will fluctuate significantly, and you may not be able to resell your shares at or above your investment price.

Our stock price experiences significant volatility, which often does not directly relate to our operating performance. For example, in 2024, the closing price of our common stock on the Nasdaq Global Select Market ranged from $46.36 to $108.06. Factors that have caused and could cause in the future volatility in the market price of our common stock include, but are not limited to: announcements concerning MYQORZO; any of the clinical trials for our drug candidates (including, but not limited to, the timing of initiation or completion of such trials and the results of such trials, and delays or discontinuations of such trials, including delays resulting from slower than expected or suspended patient enrollment or discontinuations resulting from a failure to meet pre-defined clinical end points); the commencement, settlement or adverse conclusion of litigation or a governmental investigation; failure or discontinuation of any of our research programs; issuance of new or changed securities analysts’ reports or recommendations; market conditions in the pharmaceutical, biotechnology and other healthcare-related sectors; actual or anticipated fluctuations in our financial and operating results; substantial sales of our common stock by our existing stockholders, whether or not related to our performance; and other factors described in this “Risk Factors” section.

Provisions in our charter documents and under Delaware law could discourage a takeover that stockholders may consider favorable and may lead to entrenchment of management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that may discourage, delay or prevent a merger, acquisition or other change in control of us that stockholders may consider favorable, including transactions in which you might otherwise receive a premium for your shares. Among other things, these provisions: establish a classified board of directors with three-year staggered terms, which may delay the ability of stockholders to change the membership of a majority of our board of directors; prohibit removal of directors without cause; authorize our board of directors to issue preferred stock and to determine the price and other terms of those shares, including preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a hostile acquirer; require the approval of at least two-thirds of the shares entitled to vote at an election of directors to adopt, amend or repeal our bylaws or our amended and restated certificate of incorporation regarding the election and removal of directors; do not allow stockholders to call a special meeting of stockholders; and require stock holders to provide advance notice in order to nominate candidates to our board of directors or to propose matters to be acted upon at a stockholders’ meeting, which may discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of us.

We are also subject to the anti-takeover provisions contained in Section 203 of the Delaware General Corporation Law. Under Section 203, a corporation may not, in general, engage in a business combination with any holder of 15% or more of its capital stock unless the holder has held the stock for three years or, among other exceptions, the board of directors has approved the transaction. These provisions could discourage potential acquisition proposals and could delay or prevent a change in control transaction. They could also have the effect of discouraging others from making tender offers for our common stock, including transactions that may be in your best interests. These provisions may also prevent changes in our management or limit the price that investors are willing to pay for our stock.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

ITEM 2. PROPERTIES

Our material facilities consist of 234,892 square feet of leased office and laboratory space at 350 Oyster Point, South San Francisco, California. Our lease over this property expires in 2033.

We believe that these facilities are suitable and adequate for our current needs.

ITEM 3. LEGAL PROCEEDINGS

Judah Seidman, Individually and on Behalf of All Others Similarly Situated, Plaintiff, v. Cytokinetics, Incorporated and Robert I. Blum, Civil Action No.: 3:25-cv-07923

On September 17, 2025, a stockholder class action lawsuit (the "Action") was filed against the Company and its chief executive officer in the United States District Court for the Northern District of California, alleging certain violations under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934. The Action was purportedly filed on behalf of a class consisting of all investors who purchased or otherwise acquired our common stock between December 27, 2023 and May 6, 2025. The Action alleges that the Company made materially false and misleading statements regarding the timeline for the NDA regulatory approval process for aficamten and that the Company failed to disclose related material risks. The complaint seeks unspecified damages, legal fees, and costs. On December 22, 2025, a lead plaintiff was appointed. The deadline for the lead plaintiff to file an amended compliant is March 10, 2026. We dispute any allegations of wrongdoing and intend to vigorously defend against the Action and expect to file a motion to dismiss within 60 days of the lead plaintiff filing an amended complaint.

We are not presently a party to any other legal proceedings that in the opinion of our management, if determined adversely to us, would individually or taken together have a material adverse effect on our consolidated results of operations, financial condition or cash flows.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

PART II

ITEM 5. MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market information for common stock

Our common stock is listed on the Nasdaq Global Select Market under the symbol “CYTK.”

Performance Graph

The comparisons in the table below are required by the SEC and are not intended to forecast or be indicative of possible future performance of our common stock. This graph shall not be deemed “soliciting material” or be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities under that Section, and shall not be deemed to be incorporated by reference into any of our filings under the Securities Act, whether made before or after the date hereof and irrespective of any general incorporation language in any such filing, except to the extent we specifically incorporate it by reference into such filing.

The following graph compares cumulative total return of our common stock with the cumulative total return of (i) The Nasdaq Composite Index, and (ii) The Nasdaq Biotechnology Index. The graph assumes (a) $100 was invested on December 30, 2020 in each of our common stock, the stocks comprising the Nasdaq Composite Index and the stocks comprising the Nasdaq Biotechnology Index, and (b) the reinvestment of dividends into shares of common stock; however, no dividends have been declared on our common stock to date.

Holders of Record

As of February 23, 2026, we had 38 holders of record of common stock. The number of holders of record is based upon the actual number of holders registered as of such date and does not include holders of shares in “street name” or persons, partnerships, associates, corporations or other entities in security position listings maintained by depositories.

Dividends

We have never declared or paid, and do not anticipate declaring or paying in the foreseeable future, any cash dividends on our capital stock. Any future determination to declare cash dividends will be made at the discretion of our Board of Directors, subject to applicable laws, and will depend on our financial condition, results of operations, capital requirements, general business conditions and other factors that our board of directors may deem relevant.

Unregistered Sales of Equity Securities

None.

Issuer Purchases of Equity Securities

None.

ITEM 6. [RESERVED]

ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

This discussion and analysis should be read in conjunction with our financial statements and accompanying notes included elsewhere in this report. Operating results are not necessarily indicative of results that may occur in future periods.

Overview

We are a biopharmaceutical company focused on discovering, developing and commercializing novel muscle activators and muscle inhibitors as potential treatments for debilitating diseases in which muscle performance is compromised and/or declining. We have discovered and are developing muscle-directed investigational medicines that may potentially improve the healthspan of people with devastating cardiovascular and neuromuscular diseases of impaired muscle function. Our research and development activities relating to the biology of muscle function have evolved from our knowledge and expertise regarding the cytoskeleton, a complex biological infrastructure that plays a fundamental role within every human cell. As a leader in muscle biology and the mechanics of muscle performance, we are discovering and developing small molecule drug candidates specifically engineered to impact muscle function and contractility with objective to build a sustainable specialty biopharmaceutical business.

Our first commercial product is MYQORZO™ (aficamten), 5 mg, 10 mg, 15 mg, and 20 mg tablets which the FDA approved in December 2025. MYQORZO has since been approved in both the European Union and China. MYQORZO is an allosteric and reversible inhibitor of cardiac myosin motor activity. The approval of MYQORZO included a risk evaluation and mitigation strategy (REMS) program to ensure the benefits of the drug outweigh the risk of heart failure due to systolic dysfunction. In patients with oHCM, myosin inhibition with MYQORZO reduces cardiac contractility and left ventricular outflow tract obstruction. MYQORZO became available for prescription to patients on January 27, 2026 in the United States. We expect that MYQORZO will be made available in the European Union (starting with Germany in the second quarter) and China in 2026

For further information regarding our business, refer to Part I, Item 1. Business of this Annual Report on Form 10-K.

Liquidity and Capital Resources

Our cash, cash equivalents, and investments and a summary of our borrowings and working capital as of December 31, 2025 and 2024 are summarized as follows (in millions):

The following table shows a summary of our cash flows for the periods set forth below (in millions):