Trinseo (TSE) SVP has shares withheld to cover RSU tax bill

Rhea-AI Filing Summary

Trinseo PLC senior vice president Yang Arthas Bing reported routine share dispositions related to taxes on equity awards. On two dates in February 2026, a total of 2,445 ordinary shares were withheld by the company at a price of $0.3276 per share to cover tax liabilities when previously granted restricted stock units vested. These tax-withholding transactions were not open-market sales. After these entries, Bing directly owned 52,005 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

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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)
02/21/2026

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		1,898(1)	D	$0.3276	52,552	D
Ordinary Shares	02/22/2026		F		547(1)	D	$0.3276	52,005	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	02/24/2026
	** Signature of Reporting Person	Date
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FAQ

What insider transactions did Trinseo (TSE) SVP Yang Arthas Bing report?

Yang Arthas Bing reported two tax-related share dispositions totaling 2,445 Trinseo ordinary shares. The company withheld these shares at $0.3276 per share to pay taxes due upon vesting of previously granted restricted stock units, rather than Bing selling shares in the open market.

Were the Trinseo (TSE) insider transactions open-market sales of shares?

No, the transactions were not open-market sales. Trinseo withheld 2,445 ordinary shares from Yang Arthas Bing to satisfy tax obligations triggered when restricted stock units vested, as allowed under equity award terms. This is a common administrative mechanism rather than a discretionary share sale.

How many Trinseo (TSE) shares were involved in the SVP’s tax-withholding dispositions?

The filing shows 1,898 ordinary shares withheld on February 21, 2026 and 547 shares on February 22, 2026, for a total of 2,445 shares. All were applied to cover tax liabilities tied to vesting restricted stock units.

What price per share was used for Trinseo (TSE) tax-withholding transactions?

Both tax-withholding transactions used a price of $0.3276 per Trinseo ordinary share. This price was applied when 1,898 shares and 547 shares were withheld to pay taxes arising from the vesting of previously granted restricted stock units held by the SVP.

How many Trinseo (TSE) shares does Yang Arthas Bing own after these transactions?

After the reported tax-withholding dispositions, Yang Arthas Bing directly owned 52,005 Trinseo ordinary shares. This remaining balance reflects his continuing equity stake following the company’s withholding of 2,445 shares to satisfy tax obligations on vested restricted stock units.

What is the nature of the Form 4 transactions filed for Trinseo (TSE)?

The Form 4 reports code “F” transactions, which are tax-withholding dispositions. Trinseo withheld ordinary shares from SVP Yang Arthas Bing to pay tax liabilities upon restricted stock unit vesting, rather than him executing voluntary market purchases or sales of company stock.