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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM SD

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Specialized Disclosure Report


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Trinseo PLC

(Exact name of registrant as specified in its charter)


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Ireland

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001-36473

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N/A

(State or other jurisdiction
of incorporation or organization)

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(Commission
File Number)

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(I.R.S. Employer
Identification Number)

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440 East Swedesford Road, Suite 301

Wayne, Pennsylvania 19087

(Address of principal executive offices) (Zip code)

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Angelo Chaclas, Senior Vice President, Chief Legal Counsel,

Chief Compliance Officer and Corporate Secretary (610) 240-3200

(Name and telephone number, including area code, of the person to contact in connection with this report.)


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Check the appropriate box to indicate the rule pursuant to which this Form is being submitted, and provide the period to which the information in this Form applies:

 

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Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2024.

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☐Rule 13q-1 under the Securities Exchange Act (17 CFR 240.13q-1) for the fiscal year ended    .

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Section 1 - Conflict Minerals Disclosure

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Item 1.01 Conflict Minerals Disclosure and Report

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Trinseo PLC (the “Company”) is filing this Form SD pursuant to Rule 13p-1 under the Securities Exchange Act of 1934, as amended, for the reporting period from January 1, 2024 to December 31, 2024.

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The description of the Company’s reasonable country of origin inquiry (RCOI) process, the results of its inquiry, and the determination reached as a result of the RCOI are included in the Company’s Conflict Minerals Report, attached as an exhibit to this Form SD.

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Conflict Mineral Disclosure

A copy of the Company’s Conflict Minerals Report is provided as Exhibit 1.01 to this Form SD and is publicly available on the Company’s website at https://www.trinseo.com/conflict-minerals-statement. The content of the website referenced is included for information purposes only and is not incorporated by reference into this Form SD.

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Item 1.02 Exhibit

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A copy of the Conflict Minerals Report is filed as Exhibit 1.01 hereto.

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Section 2 – Exhibits

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Item 2.01Exhibits

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1.01Conflict Minerals Report as required by Items 1.01 and 1.02 of this Form SD

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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 duly authorized undersigned.

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TRINSEO PLC

By:

/s/ Angelo Chaclas

Name:

Angelo Chaclas

Title:

Senior Vice President, Chief Legal Counsel,

Chief Compliance Officer and Corporate Secretary

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Date:

May 23, 2025

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