Form 8-K Trinseo PLC For: Jul 17

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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): July 17, 2026

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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 8.01Other Events.

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Trinseo PLC (the “Company”) will hold its annual general meeting of shareholders on September 23, 2026 at 8:30 a.m. EST (the “Annual Meeting”) for shareholders of record as of July 30, 2026. The Annual Meeting will be held at the Company’s headquarters at 440 East Swedesford Road, Suite 301, Wayne, Pennsylvania 19087. The Company’s shareholders in Ireland may participate in the Annual Meeting by audio and video link at McCann FitzGerald LLP, Riverside One, Sir John Rogerson's Quay, Grand Canal Dock, Dublin 2, D02 X576, Ireland. Shareholders who plan to attend the Annual Meeting will be required to register in advance. Additional details about registration and attendance at the Annual Meeting will be provided in our proxy statement.

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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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