Tax withholding transaction reported by Trinseo (TSE) VP Roger Greene

Rhea-AI Filing Summary

Trinseo PLC executive Roger Greene reported an automatic tax-related share disposition linked to equity compensation. On this Form 4, the company withheld 2,517 Ordinary Shares at $0.23 per share to cover taxes due after restricted stock units vested. Following this withholding transaction, Greene directly held 45,101 Ordinary Shares. This reflects routine tax-settlement activity rather than an open-market buy or sell decision.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Greene Roger

Role VP, GLOBAL CONTROLLER & PAO

Type	Security	Shares	Price	Value
Tax Withholding	Ordinary Shares	2,517	$0.23	$578.91

Holdings After Transaction: Ordinary Shares — 45,101 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Greene Roger

(Last) (First) (Middle)

C/O TRINSEO PLC

440 EAST SWEDESFORD ROAD, SUITE 301

(Street)

WAYNE PA 19087

(City) (State) (Zip)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP, GLOBAL CONTROLLER & PAO

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	02/27/2026		F		2,517(1)	D	$0.23	45,101	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares withheld by the Company to pay taxes due following the vesting of restricted stock units.

	/s/ Angelo Chaclas, Attorney-in-Fact	03/03/2026
	** 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 4 (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 insider transaction did Trinseo (TSE) report for Roger Greene?

Trinseo reported that executive Roger Greene had 2,517 Ordinary Shares withheld to cover taxes after restricted stock units vested. This was a tax-withholding disposition, not an open-market purchase or sale, and is typical for equity compensation settlements.

How many Trinseo (TSE) shares were involved in Roger Greene’s Form 4 filing?

The Form 4 shows 2,517 Ordinary Shares were disposed of at $0.23 per share through company withholding to pay tax liabilities on vested restricted stock units. This transaction reflects administrative settlement of taxes, not a discretionary trading decision.

Does the Trinseo (TSE) Form 4 indicate an open-market sale by Roger Greene?

No, the filing describes a tax-withholding disposition, where 2,517 shares were withheld by the company to pay taxes on vested restricted stock units. It is not characterized as an open-market sale by Roger Greene.

What is Roger Greene’s Trinseo (TSE) shareholding after this Form 4 transaction?

After the tax-withholding transaction, Roger Greene directly held 45,101 Ordinary Shares of Trinseo. This post-transaction balance is disclosed in the Form 4 and reflects his remaining direct ownership following the RSU-related share withholding for taxes.

What does transaction code “F” mean in the Trinseo (TSE) Form 4 for Roger Greene?

Transaction code “F” indicates payment of a tax liability or exercise price by delivering or withholding securities. In this case, 2,517 Ordinary Shares were withheld by Trinseo to pay taxes owed when Greene’s restricted stock units vested.