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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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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): 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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ITEM 2.05 Costs Associated with Exit or Disposal Activities.

On August 17, 2023, the management team of Trinseo PLC (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, and consolidate manufacturing operations. The Plan includes 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 batch polyester tray casting plant in Belen, New Mexico, and (iii) closure of its PMMA extruded sheet production line at its Rho, Italy plant. The Plan also includes certain other workforce reductions to streamline the Company’s internal general & administrative network. These actions are part of a previously announced restructuring initiative, which is expected to include the potential closure of the Company’s Terneuzen, the Netherlands styrene plant pending final approval from the Company’s board.

The Plan is expected to be substantially completed by the end of 2024. The Company expects to incur total restructuring charges in connection with the Plan ranging from approximately $22 million to $27 million. The total charges will consist of approximately $10 million to $12 million of severance benefits to affected employees; approximately $8 million to $9 million of asset-related charges, primarily for accelerated depreciation; approximately $2 million to $4 million related to decommissioning and demolition costs; and approximately $1 million to $3 million of other costs. Of these charges, approximately $19 million to $24 million are expected to be incurred in 2023, with the majority of the remainder expected to be incurred through 2024. The cash amount of these charges, primarily related to severance benefits to affected employees, is expected to be approximately $12 million to $14 million with substantially all charges expected to be incurred by the end of 2024. However, the actual timing and costs of the Plan may differ from the Company’s current expectations and estimates and such differences may be material. These charges are subject to ongoing negotiations with works councils, industrial associations and government authorities.

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 the Company’s current expectations and assumptions regarding its business, the economy, its current indebtedness, accessibility of debt markets, 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 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 meet the conditions of the partial redemption of our 5.375% Notes due 2025, including consummation of a financing transaction, and our ability to complete the partial redemption; our ability to successfully execute our business and transformation strategy; increased costs or disruption in the supply of raw materials; increased energy costs; compliance with laws and regulations impacting our business; conditions in the global economy and capital markets; 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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