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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): November 3, 2023

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Trinseo PLC

(Exact name of registrant as specified in its charter)

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Ireland | ​ | 001-36473 | ​ | N/A
(State or other jurisdiction of incorporation or organization) | ​ | (Commission File Number) | ​ | (I.R.S. Employer Identification Number)

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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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☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

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Title of Each Class | Trading symbol | Name of Exchange on which registered
Ordinary Shares, par value $0.01 per share | TSE | New York Stock Exchange

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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 2.02 | Results of Operations and Financial Condition

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On November 3, 2023, Trinseo PLC, a public limited company existing under the laws of Ireland (the “Company”), issued a press release announcing its financial results for the third quarter ended September 30, 2023. A copy of the press release is furnished as Exhibit 99.1 hereto. The Company intends to hold an investor call and webcast to discuss these results on Monday, November 6, 2023 at 10 AM Eastern Time. Ahead of this call the Company is also making available on its website an investor presentation, which will be discussed on the call and is furnished as Exhibit 99.2 hereto.

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The information contained herein and in the accompanying exhibits shall not be deemed filed for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in such a filing.

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ITEM 9.01. | Financial Statements and Exhibits

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(d) Exhibits

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ay | ​ | ​
Exhibit Number | ​ | Description
99.1 | ​ | Press Release dated November 3, 2023
99.2 | ​ | Investor Presentation, dated November 3, 2023
104 | ​ | Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101)

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SIGNATURES

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

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a | ​ | ​ | ​
​ | ​ | TRINSEO PLC
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​ | ​ | By: | /s/ David Stasse
​ | ​ | Name: | David Stasse
​ | ​ | Title: | Executive Vice President and Chief Financial Officer
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Date: November 3, 2023 ​ | ​ | ​ | ​

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