Submission of Matters to a Vote of Security Holders Form 8 K

ITEM 5.07

Submission of Matters to a Vote of Security Holders.

On June 26, 2024, Trinseo PLC (the "Company") held its Annual General Meeting of Shareholders. A total of 30,468,682 ordinary shares were present or represented by proxy, which accounted for approximately 86% of the shares entitled to vote at the Annual General Meeting. The Company's shareholders voted on the following six proposals and cast their votes as set forth below.

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Annual General Meeting Proposal One: Election of Eleven Directors

The Company's shareholders approved the election of eleven director nominees to serve a term expiring at the end of the 2025 annual general meeting of shareholders by the votes set forth in the table below:

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Name	For	Against	Abstain	Broker Non-Votes
K'Lynne Johnson	24,879,047	1,046,888	13,895	4,528,852
Joseph Alvarado	24,917,709	1,016,863	5,258	4,528,852
Frank Bozich	25,345,732	576,548	17,550	4,528,852
Victoria Brifo	25,280,046	654,273	5,511	4,528,852
Jeffrey Cote	25,006,971	926,439	6,420	4,528,852
Pierre-Marie De Leener	25,264,526	669,197	6,107	4,528,852
Jeanmarie Desmond	25,325,722	608,000	6,108	4,528,852
Matthew Farrell	25,281,216	652,383	6,231	4,528,852
Sandra Beach Lin	25,115,914	817,820	6,096	4,528,852
Henri Steinmetz	25,383,661	546,561	9,608	4,528,852
Mark Tomkins	25,098,906	835,095	5,829	4,528,852

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Annual General Meeting Proposal Two: Approval, on an Advisory Basis, of the Company's Named Executive Officers Compensation

The Company's shareholders approved, on an advisory basis, the compensation paid to the Company's named executive officers by the votes set forth in the table below:

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For	Against	Abstain	Broker Non-Votes
24,740,670	1,190,312	8,848	4,528,852

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Annual General Meeting Proposal Three: Ratification of the Appointment of the Company's Independent Registered Public Accounting Firm

The Company's shareholders ratified the audit committee's appointment of PricewaterhouseCoopers LLP to be the Company's independent registered public accounting firm for the year ending December 31, 2024, and to authorize, by binding vote, the Audit Committee of the Board to set its auditors' remuneration by the votes set forth in the table below:

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For	Against	Abstain
29,952,247	511,241	5,194

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Annual General Meeting Proposal Four: Approval of Authority to Issue Shares

The Company's shareholders approved the grant of authority of the Company's Board of Directors to issue shares, by the votes set forth in the table below:

For	Against	Abstain
27,638,148	2,807,099	23,435

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Annual General Meeting Proposal Five: Approval of Authority to Opt Out of Statutory Pre-emption Rights

The Company's shareholders approved the authority of the Company's Board of Directors to opt out of statutory pre-emption rights, with respect to up to 10% of issued share capital, by the votes set forth in the table below:

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27,363,7093,079,58125,392
For	Against	Abstain
27,363,709	3,079,581	25,392

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Annual General Meeting Proposal Six: Approval of Price Range for Re-issuance of Treasury Shares

The Company's shareholders approved the price range for the Company's re-issuance of treasury shares, as described in the proxy statement, by the votes set forth in the table below:

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For	Against	Abstain
27,842,893	2,596,723	29,066

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