Trinseo (NYSE: TSE) SVP uses 1,496 shares to cover RSU taxes

Rhea-AI Filing Summary

Trinseo PLC senior vice president Francesca Reverberi reported two small share dispositions related to tax withholding, not open-market trading. On February 21 and 22, she transferred 1,163 and 333 ordinary shares, respectively, at $0.3276 per share to cover tax liabilities on vesting restricted stock units.

After these tax-withholding dispositions, Reverberi directly owned 162,635 Trinseo ordinary shares. The filing clarifies the shares were withheld by the company to pay taxes due upon the vesting of previously granted restricted stock units, rather than discretionary sales in the market.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Reverberi Francesca

Role SVP, EM and Polymer Solutions

Type	Security	Shares	Price	Value
Tax Withholding	Ordinary Shares	333	$0.3276	$109.09
Tax Withholding	Ordinary Shares	1,163	$0.3276	$381.00

Holdings After Transaction: Ordinary Shares — 162,635 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^*

Reverberi Francesca

(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, EM and Polymer Solutions

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		1,163(1)	D	$0.3276	162,968	D
Ordinary Shares	02/22/2026		F		333(1)	D	$0.3276	162,635	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
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 transactions did Trinseo (TSE) report for Francesca Reverberi?

Trinseo reported that executive Francesca Reverberi disposed of small blocks of shares to cover tax withholding on vested restricted stock units, rather than selling shares in the open market. Two transactions occurred on February 21 and 22, involving 1,163 and 333 ordinary shares.

How many Trinseo (TSE) shares were used for tax withholding in this Form 4?

The Form 4 shows 1,496 Trinseo ordinary shares in total were withheld for taxes, consisting of 1,163 shares on February 21 and 333 shares on February 22. These were company-withheld shares to satisfy tax liabilities on vested restricted stock units.

At what price were the Trinseo (TSE) tax-withholding shares valued in the filing?

Both tax-withholding dispositions in the Form 4 used a value of $0.3276 per Trinseo ordinary share. This per-share amount was applied to 1,163 shares on February 21 and 333 shares on February 22 when calculating the tax withholding value.

How many Trinseo (TSE) shares does Francesca Reverberi own after these transactions?

Following the reported tax-withholding dispositions, Francesca Reverberi directly holds 162,635 Trinseo ordinary shares. This figure reflects ownership after the company withheld 1,496 shares in total to pay taxes due upon vesting of previously granted restricted stock units.

Were the Trinseo (TSE) insider transactions open-market sales or tax-related?

The transactions were tax-related dispositions, not open-market sales. The Form 4 and footnote explain that Trinseo withheld the shares to pay taxes due when previously granted restricted stock units vested, using transaction code F for tax-liability settlement.

What does transaction code F mean in the Trinseo (TSE) Form 4 filing?

Transaction code F indicates payment of an exercise price or tax liability by delivering securities. In this Trinseo filing, it reflects shares withheld by the company to cover taxes owed when restricted stock units vested for executive Francesca Reverberi.