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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K/A

Amendment No. 1

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CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported): October 26, 2023 (August 17, 2023)

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Trinseo PLC

(Exact name of registrant as specified in its charter)

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440 East Swedesford Road, Suite 301,

Wayne, Pennsylvania 19087

(Address of principal executive offices, including zip code)

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(610) 240-3200

(Telephone number, including area code)

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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 (see General Instruction A.2. below):

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

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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).

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Emerging growth company ☐

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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. ☐

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Explanatory Note

This Current Report on Form 8-K/A (this “Current Report”) amends the Current Report on Form 8-K filed by Trinseo PLC (the “Company”) with the Securities and Exchange Commission on August 17, 2023 (the “Original Report”) and is being filed in order to update and supplement the Company’s disclosure under Item 2.05 of the Original Report, to disclose the expansion of the scope of the Plan. The Original Report otherwise remains unchanged.

ITEM 2.05 Costs Associated with Exit or Disposal Activities.

As previously disclosed in the Original Report, on August 17, 2023, the management team of the Company, upon authorization from the Company’s Board of Directors, approved a restructuring plan (the “Plan”) designed to optimize its PMMA sheet network, primarily in Europe, including the consolidation of manufacturing operations. The Plan included closure of certain plants and product lines, including (i) closure of manufacturing operations at the Company’s PMMA cast sheets plant in Bronderslev, Denmark, (ii) closure of manufacturing operations at the Company’s PMMA continuous sheet plant in Belen, New Mexico, and (iii) closure of its PMMA extruded sheet production line at its Rho, Italy plant. The Plan also included certain other workforce reductions to streamline the Company’s internal general & administrative network.

On October 26, 2023, the management team of the Company, with authorization from the Company’s Board of Directors, approved additional actions to discontinue styrene production at the Company’s Terneuzen, the Netherlands plant, decommission the styrene plant assets, as well as related workforce reductions.

These additional actions are expected to result in estimated restructuring charges of $58 million to $68 million, consisting of approximately $19 million to $21 million of asset-related charges, primarily for accelerated depreciation; approximately $20 million to $23 million related to decommissioning costs; approximately $16 million to $19 million of contract terminations and other costs; and $3 million to $5 million of severance benefits to affected employees. Actions are expected to be substantially completed by the end of 2025. The anticipated future cash payments associated with these charges, primarily related to decommissioning, contract termination costs and severance benefits are expected to be approximately $32 million to $40 million with substantially all payments to be made by the end of 2025.

All other charges and costs disclosed within the Original Report have been confirmed with no material changes.

ITEM 8.01 Other Events.

A copy of the press release announcing the Terneuzen closure is furnished herewith as Exhibit 99.1 and is incorporated herein by reference.

Cautionary Note on Forward-Looking Statements

This Current Report may contain forward-looking statements including, without limitation, statements concerning plans, objectives, goals, projections, forecasts, strategies, future events or performance, and underlying assumptions and other statements, which are not statements of historical facts or guarantees or assurances of future performance. Forward-looking statements may be identified by the use of words like “expect,” “anticipate,” “believe,” “intend,” “forecast,” “outlook,” “will,” “may,” “might,” “see,” “tend,” “assume,” “potential,” “likely,” “target,” “plan,” “contemplate,” “seek,” “attempt,” “should,” “could,” “would” or expressions of similar meaning. Forward-looking statements reflect management’s evaluation of information currently available and are based on our current expectations and assumptions regarding our business, the economy, our current indebtedness, and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Factors that might cause future results to differ from those expressed by the forward-looking statements include, but are not limited to, our ability to successfully investigate and remediate chemical releases on or from our sites, make related capital expenditures, reimburse third-party cleanup costs or settle potential regulatory penalties or other claims; our ability to successfully implement proposed restructuring initiatives, including the closure of certain plants and product lines, and to successfully generate cost savings and increase profitability; our ability to successfully execute our business and transformation strategy; increased costs or disruption in the supply of raw materials; increased energy costs; our ability to successfully generate cost savings and increase profitability through asset restructuring initiatives; compliance with laws and regulations impacting our business; conditions in the global economy and capital markets; our ability to meet the covenants under our existing indebtedness; our ability to successfully investigate and remediate chemical releases on or from our sites, make related capital expenditures, reimburse third-party cleanup costs or settle potential regulatory penalties or other claims; and those discussed in our Annual Report on Form 10-K, under Part I, Item 1A —”Risk Factors” and elsewhere in our other reports, filings and furnishings made with the U.S. Securities and Exchange

Commission from time to time. As a result of these or other factors, the Company’s actual results, performance or achievements may differ materially from those contemplated by the forward-looking statements. Therefore, we caution you against relying on any of these forward-looking statements. The forward-looking statements included in this Current Report are made only as of the date hereof. The Company undertakes no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

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SIGNATURE

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.

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