TSE Form 4: Victoria Brifo Withholds 9,576 Shares at $3.73

Rhea-AI Filing Summary

Trinseo PLC (Ticker: TSE) filed a Form 4 disclosing that director Victoria Brifo had shares withheld to cover tax obligations arising from the vesting of previously granted restricted stock units.

The filing shows a single non-derivative transaction dated 06/21/2025 with transaction code “F” (payment of tax withholdings). A total of 9,576 ordinary shares were surrendered at an indicated price of $3.73 per share, equal to roughly $35.7 thousand. Following the withholding, Brifo’s direct beneficial ownership stands at 40,741 ordinary shares.

No derivative securities were involved and there were no open-market purchases or discretionary sales. Because the transaction was for tax withholding, it does not necessarily reflect the insider’s sentiment about Trinseo’s prospects, but it does reduce her outstanding share count by approximately 19% from the pre-withholding total of 50,317 shares.

Other than the routine tax-related share surrender, the filing contains no additional material changes, corporate actions, or strategic commentary.

Positive

• None.

Negative

• Insider shareholdings declined by 9,576 shares (≈19% of prior holdings), which may be perceived negatively despite being tax-related.

Insights

Financial Analyst

TL;DR: Routine tax-withholding; neutral for valuation, slight optics hit due to insider share reduction.

The Form 4 reports a code F transaction where director Victoria Brifo had 9,576 shares withheld at $3.73 to satisfy taxes on vested RSUs. Post-transaction holdings are 40,741 shares. This event is administrative and non-discretionary, so it carries no direct signal on future earnings or cash flows. The share count surrendered is modest relative to Trinseo’s 34 million-plus shares outstanding and should have an immaterial impact on float or supply–demand dynamics. From a valuation standpoint the filing is neutral.

Corporate Governance Expert

TL;DR: Compliance-driven filing; no governance red flags detected.

Code F transactions are treated favorably by governance observers because the insider does not exercise discretion to sell; shares are automatically withheld by the issuer for statutory tax obligations. Brifo remains compliant with Section 16 reporting timelines (filed within two business days). Her remaining 40,741-share stake continues to align her interests with shareholders. No 10b5-1 plan was cited, but one is not required for a tax-withholding event. Overall, the governance impact is neutral and non-material to investors’ oversight considerations.

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^*

Brifo Victoria

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
06/21/2025

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	06/21/2025		F		9,576(1)	D	$3.73	40,741	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	06/24/2025
	** 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

How many Trinseo (TSE) shares were surrendered in the latest Form 4?

9,576 ordinary shares were withheld for taxes.

Who filed the Form 4 for Trinseo on 06/24/2025?

Director Victoria Brifo filed the statement.

What does transaction code "F" mean in the Trinseo Form 4?

Code F denotes shares withheld to pay taxes upon the vesting of equity awards.

What is Victoria Brifo's remaining share ownership after the transaction?

She now owns 40,741 ordinary shares directly.

At what price were the Trinseo shares valued for the tax withholding?

The indicated price was $3.73 per share.