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

Rhea-AI Filing Summary

Trinseo PLC senior executive reports tax-related share disposition

Trinseo PLC executive Francesca Reverberi, SVP for EM and Polymer Solutions, reported a tax-withholding disposition of 1,385 ordinary shares on February 27, 2026. The shares were withheld by the company to cover taxes due upon vesting of previously granted restricted stock units.

After this withholding, Reverberi held 161,250 ordinary shares directly. The transaction used code “F,” indicating payment of tax liability by delivering securities rather than an open-market sale.

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^*

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)
02/27/2026

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		1,385(1)	D	$0.23	161,250	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 Francesca Reverberi?

Trinseo reported that executive Francesca Reverberi had 1,385 ordinary shares disposed to the company to pay taxes due upon vesting of restricted stock units. This code F transaction reflects tax withholding, not an open-market trade, and is a routine administrative event.

Was the Trinseo (TSE) insider transaction a sale in the open market?

No, the transaction was not an open-market sale. The 1,385 shares were withheld by Trinseo to satisfy tax obligations arising from the vesting of previously granted restricted stock units, as indicated by transaction code F and the accompanying explanatory footnote.

How many Trinseo (TSE) shares does Francesca Reverberi hold after the transaction?

Following the tax-withholding disposition, Francesca Reverberi directly holds 161,250 Trinseo ordinary shares. This figure reflects her position after 1,385 shares were withheld by the company on February 27, 2026 to cover taxes on vested restricted stock units.

What does Form 4 transaction code F mean for Trinseo (TSE)?

For Trinseo, transaction code F on Form 4 means shares were used to pay the exercise price or tax liability. In this case, 1,385 shares were withheld from executive Francesca Reverberi to cover taxes owed when previously granted restricted stock units vested.

Does the Trinseo (TSE) Form 4 indicate buying or selling by the executive?

The Form 4 indicates a disposition, not a purchase or typical sale. Shares were withheld by Trinseo from executive Francesca Reverberi to satisfy tax obligations on vesting restricted stock units, so there was no open-market buying or selling activity involved in this transaction.