Trinseo (TSE) VP Greene has 2,238 shares withheld to cover taxes

Rhea-AI Filing Summary

Trinseo PLC executive Roger Greene reported a routine tax-related share disposition. On February 21, 2026, 2,238 ordinary shares were withheld by the company at a price of $0.3276 per share to cover taxes due upon vesting of restricted stock units.

After this tax-withholding disposition, Greene directly owned 47,618 Trinseo ordinary shares. This was not an open-market buy or sell transaction but an administrative step tied to equity compensation.

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

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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)
02/21/2026

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	02/21/2026		F		2,238(1)	D	$0.3276	47,618	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	02/24/2026
	** 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).
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FAQ

What insider transaction did Trinseo (TSE) executive Roger Greene report?

Roger Greene reported a tax-related share disposition, where 2,238 Trinseo ordinary shares were withheld by the company. The shares covered taxes due when his restricted stock units vested, rather than representing an open-market sale or purchase of stock.

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

The filing shows 2,238 Trinseo ordinary shares were disposed of through withholding. These shares were retained by the company to satisfy Greene’s tax liability triggered by the vesting of restricted stock units, a standard administrative feature of equity compensation programs.

At what price were Roger Greene’s Trinseo (TSE) shares withheld for taxes?

The shares were withheld at a price of $0.3276 per Trinseo ordinary share. This price is used in the Form 4 to calculate the value of stock applied to Greene’s tax obligation when his restricted stock units vested at the company.

How many Trinseo (TSE) shares does Roger Greene own after this transaction?

Following the tax-withholding disposition, Roger Greene directly owns 47,618 Trinseo ordinary shares. This post-transaction balance reflects his remaining equity position after 2,238 shares were withheld to cover taxes on vesting restricted stock units.

Was Roger Greene’s Trinseo (TSE) Form 4 an open-market sale of shares?

No, the Form 4 reflects a tax-withholding disposition, not an open-market sale. Shares were withheld by Trinseo to pay taxes due upon restricted stock units vesting, a common administrative mechanism in stock-based compensation plans.

What does transaction code F mean in Roger Greene’s Trinseo (TSE) filing?

Transaction code F indicates payment of an exercise price or tax liability by delivering securities. In this case, Trinseo withheld 2,238 ordinary shares from Roger Greene to satisfy taxes owed when his restricted stock units vested.