Trinseo PLC (NYSE: TSE) director files Form 3 showing no share ownership

Rhea-AI Filing Summary

Trinseo PLC director Frizzley Jill Kathleen filed an initial ownership report on Form 3 in connection with an event dated 01/16/2026. The filing identifies her as a director of Trinseo PLC and states that she does not beneficially own any Trinseo securities. Both the non-derivative and derivative tables are effectively empty, and the explanation section explicitly notes that no securities are beneficially owned.

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Frizzley Jill Kathleen

(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

Who filed this Form 3 for Trinseo PLC (TSE)?

The Form 3 was filed by Frizzley Jill Kathleen, who is identified as a director of Trinseo PLC.

What does this Trinseo PLC (TSE) Form 3 disclose about share ownership?

The filing states in the explanation of responses that no securities are beneficially owned by the reporting person.

What is the event date on this Trinseo PLC (TSE) Form 3?

The Form 3 lists the Date of Event Requiring Statement as 01/16/2026.

What is the reporting person’s relationship to Trinseo PLC (TSE)?

The reporting person is marked as a Director of Trinseo PLC and is not checked as an officer or 10% owner.

Are there any derivative securities reported for Trinseo PLC (TSE) on this Form 3?

No. The derivative securities table is included in the form layout, but the explanation clarifies that no securities are beneficially owned.

Is this Trinseo PLC (TSE) Form 3 filed by more than one reporting person?

No. The form indicates it is filed by one reporting person, not a group.