Trinseo Form 4: Alvarado Keeps 52,187 Shares After Tax Withholding

Rhea-AI Filing Summary

Trinseo PLC (TSE) submitted a Form 4 covering a single insider transaction by Director Joseph Alvarado.

On 21 June 2025, 10,327 ordinary shares were withheld by the company (transaction code “F”) to satisfy tax obligations arising from the vesting of previously granted restricted stock units. The shares were valued at $3.73, implying an aggregate value of roughly $38.5 thousand.

Following the tax-related disposition, Alvarado’s direct ownership stands at 52,187 shares. No open-market purchases or sales and no derivative security transactions were reported. Because the event is routine and non-discretionary, it generally carries neutral signaling value for investors.

Insights

Securities Analyst

TL;DR: Routine tax withholding; no change to insider sentiment or strategy.

The filing reveals a code “F” disposition—shares withheld solely to cover taxes on RSU vesting. Such transactions are automated and do not reflect an active buy/sell decision. The modest size (≈$38 k) and the remaining 52 k shares retained signal continued alignment with shareholders. No derivatives, pledges, or sales were reported, so liquidity and governance risk remain unchanged. Market impact should be negligible.

Corporate Governance Specialist

TL;DR: Compliance-driven Form 4; governance posture unchanged.

The director met Section 16 reporting obligations within the two-business-day window, demonstrating procedural compliance. The transaction involves company-directed tax settlement rather than discretionary trading, so there is no governance red flag or signaling of insider confidence. Ownership after the event (52,187 shares) maintains an economic stake regarded as adequate under prevailing board guidelines. Overall governance impact: neutral.

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^*

ALVARADO JOSEPH

(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		10,327(1)	D	$3.73	52,187	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

What did Trinseo (TSE) disclose in the latest Form 4?

Director Joseph Alvarado reported 10,327 shares withheld for taxes on vested RSUs on 06/21/2025.

How many Trinseo shares does Alvarado own after the transaction?

He now directly owns 52,187 ordinary shares.

What does SEC Form 4 transaction code "F" mean?

Code “F” denotes shares withheld by the issuer to pay taxes due upon equity award vesting.

Was this an open-market sale of Trinseo stock?

No. It was company-directed tax withholding; no open-market sale occurred.

What price was used for the withheld Trinseo shares?

The shares were valued at $3.73 each, based on the company’s determination on the vesting date.