Trinseo (TSE) SVP has 2,548 shares withheld to cover taxes

Rhea-AI Filing Summary

Trinseo PLC senior vice president Arthas Bing reported a routine tax-related share disposition. On the vesting of previously granted restricted stock units, the company withheld 2,548 Ordinary Shares to cover taxes, coded as a tax-withholding disposition. After this non‑open‑market event, Bing directly holds 49,457 Ordinary Shares.

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

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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^*

Yang Arthas Bing

(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)
	SVP, Latex Binders

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		2,548(1)	D	$0.23	49,457	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 previously granted 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).
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FAQ

What insider transaction did Trinseo (TSE) report for Arthas Bing?

Trinseo reported a tax-related share disposition for SVP Arthas Bing. The company withheld 2,548 Ordinary Shares to satisfy taxes due upon vesting of previously granted restricted stock units, a non-open-market Form 4 transaction coded as a tax-withholding disposition.

How many Trinseo (TSE) shares were withheld to cover taxes?

Trinseo withheld 2,548 Ordinary Shares to cover tax obligations. These shares were taken at the time previously granted restricted stock units vested, reflecting a standard tax-withholding mechanism rather than an open-market sale by SVP Arthas Bing.

Does the Trinseo (TSE) Form 4 show an open-market sale by Arthas Bing?

No, the Form 4 does not show an open-market sale. The 2,548 Ordinary Shares were withheld by the company to pay taxes due on vesting restricted stock units, classified as a tax-withholding disposition under transaction code F.

How many Trinseo (TSE) shares does Arthas Bing hold after this transaction?

After the tax-withholding disposition, Arthas Bing directly holds 49,457 Ordinary Shares. This figure reflects his remaining direct ownership following the company’s withholding of 2,548 shares to satisfy tax obligations linked to restricted stock unit vesting.

What does transaction code F mean in the Trinseo (TSE) insider filing?

Transaction code F indicates payment of tax liability or exercise price using company shares. In this case, 2,548 Ordinary Shares were withheld by Trinseo to pay taxes owed when Arthas Bing’s previously granted restricted stock units vested.