Trinseo (TSE) director Carol Flaton reports no beneficial ownership

Rhea-AI Filing Summary

Trinseo PLC director reports no share ownership

Trinseo PLC director Carol Flaton filed an initial ownership report stating that no Trinseo securities are beneficially owned. The Form 3 identifies Flaton as a director of Trinseo PLC and confirms there are no non-derivative or derivative securities reported as owned, meaning there are currently no Trinseo shares or related instruments attributed to this insider.

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SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Flaton Carol

(Last) (First) (Middle)

C/O TRINSEO PLC

440 EAST SWEDESFORD ROAD, SUITE 301

(Street)

WAYNE PA 19087

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/16/2026

3. Issuer Name and Ticker or Trading Symbol
Trinseo PLC [ TSE ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

No securities are beneficially owned.

	/s/ Angelo Chaclas, Attorney-in-Fact	01/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does Trinseo (TSE) disclose in this Form 3 filing?

The filing shows that director Carol Flaton reports no beneficial ownership of Trinseo PLC securities, including both non-derivative and derivative instruments.

Who is the reporting person in this Trinseo (TSE) Form 3?

The reporting person is Carol Flaton, who is identified in the filing as a director of Trinseo PLC.

Does Carol Flaton own any Trinseo PLC (TSE) shares according to this Form 3?

According to the Form 3, an explanation of responses states "No securities are beneficially owned", indicating no Trinseo shares are reported as owned.

Are any derivative securities reported for Trinseo director Carol Flaton?

No. The section for derivative securities is included but the explanation of responses clarifies that no securities are beneficially owned.

Is this Trinseo (TSE) Form 3 filed by one or multiple reporting persons?

The document indicates that the Form is filed by one reporting person, which is director Carol Flaton.