UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 29, 2026

OFFICE PROPERTIES INCOME TRUST

(Exact name of registrant as specified in its charter)

(617) 219-1440

(Registrant’s telephone number, including area code)

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

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

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company    ¨

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.  ¨

In this Current Report on Form 8-K (this “Current Report”), the terms the “Company,” “we,” “us,” and “our” refer to Office Properties Income Trust.

Item 2.02. Results of Operations and Financial Condition.

On June 4, 2026, the Company issued a presentation of supplemental information for the three months ended March 31, 2026. A copy of the Company’s presentation is furnished as Exhibit 99.1 hereto.

Item 7.01. Regulation FD Disclosure.

The disclosure set forth above under Item 2.02 of this Current Report on Form 8-K is incorporated by reference herein.

As previously reported, on October 30, 2025, the Company and its debtor affiliates (collectively, the “Debtors”) each commenced with the United States Bankruptcy Court for the Southern District of Texas (the “Bankruptcy Court”) a voluntary case (collectively, the “Chapter 11 Cases”) under chapter 11 of title 11 of the United States Code (the “Bankruptcy Code”). The Chapter 11 Cases are jointly administered under the caption In re Office Properties Income Trust, et al., Case No. 25-90530.

Monthly Operating Reports

On May 29, 2026, the Debtors filed their Monthly Operating Reports (the “MORs”) with the Bankruptcy Court. The MORs provide financial and operational information regarding the Company’s performance during the period of April 1, 2026 through April 30, 2026. The Debtors continue to operate their businesses and manage their properties as debtors-in-possession under the jurisdiction of the Bankruptcy Court and in accordance with the applicable provisions of the Bankruptcy Code and orders of the Bankruptcy Court.

The Company’s MOR is attached as Exhibit 99.2. Copies of the MORs and other filings with the Bankruptcy Court related to the Chapter 11 Cases are available for review and download, free of charge, on the website of the Debtors’ claims, noticing, and solicitation agent at https://restructuring.ra.kroll.com/OPI or through the Bankruptcy Court’s website, for a fee, at https://ecf.txsb.uscourts.gov. The information contained on, or that may be accessed through, the websites referenced in this Current Report on Form 8-K in each case is not incorporated by reference into, and is not a part of, this Current Report on Form 8-K.

Cautionary Statement Regarding the MORs

The Company cautions investors and potential investors not to place undue reliance upon the information contained in the MORs, which were not prepared for the purpose of providing the basis for an investment decision relating to any of the securities of the Company. The MORs are limited in scope, cover a limited time period, and have been prepared solely for the purpose of complying with the reporting requirements of the Bankruptcy Court. The MORs were not audited or reviewed by independent accountants, were not prepared in accordance with generally accepted accounting principles, are in a format prescribed by applicable bankruptcy rules and guidelines, and are subject to future adjustment and reconciliation. There can be no assurance that, from the perspective of an investor or potential investor in the Company’s securities, the MORs are complete. The MORs also contain information for periods which are shorter or otherwise different from those required in the Company’s reports pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and such information might not be indicative of the Company’s financial condition or operating results for the periods that would be reflected in the Company’s financial statements or in its reports pursuant to the Exchange Act. Results and projections set forth in the MORs should not be viewed as indicative of future results.

Cautionary Note Concerning Forward Looking Statements

This Current Report contains statements that constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other securities laws. Also, whenever we use words such as “believe,” “expect,” “anticipate,” “intend,” “plan,” “estimate,” “will,” “may,” and negatives or derivatives of these or similar expressions, we are making forward-looking statements. These forward-looking statements are based upon our present intent, beliefs, or expectations, but forward-looking statements are not guaranteed to occur and may not occur. Actual results may differ materially from those contained in or implied by our forward-looking statements as a result of various factors. These forward-looking statements include, among others, statements about the process and potential outcomes of the Chapter 11 Cases. Forward-looking statements are based on the Company’s current expectations, assumptions, and estimates and are subject to risk, uncertainties, and other important factors that are difficult to predict and that could cause actual results to differ materially and adversely from those expressed or implied. These risks include, among others, those related to: the Company’s ability to consummate the plan of reorganization confirmed by the Bankruptcy Court; the duration and outcome of the Chapter 11 Cases; the Company suffering from a long and protracted restructuring; the impact of the Chapter 11 Cases on the Company’s operations, reputation, and relationships with tenants, lenders, and vendors; the Company having insufficient liquidity; the availability of financing; the ability to satisfy the conditions precedent to the restructuring support agreement entered into in connection with the Chapter 11 Cases; the effectiveness of the overall restructuring activities pursuant to the Chapter 11 Cases and any additional strategies that the Company may employ to address its liquidity and capital resources and achieve its stated goals; and the Company’s historical financial information not being indicative of its future performance as a result of the Chapter 11 Cases.

The information contained in the Company’s filings with the Securities and Exchange Commission (the “SEC”), including under the caption “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 and subsequent filings with the SEC, or incorporated herein or therein, identifies other important factors that could cause differences from our forward-looking statements. The Company’s filings with the SEC are available on the SEC’s website at www.sec.gov.

You should not place undue reliance upon the Company’s forward-looking statements.

Except as required by law, we do not intend to update or change any forward-looking statements as a result of new information, future events or otherwise.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: June 4, 2026