[Form 4] Trinseo PLC Insider Trading Activity

Rhea-AI Filing Summary

Form 4 Overview – Trinseo PLC (TSE)

On 24 June 2025, Director Jeffrey J. Cote filed a Form 4 disclosing a tax-related share withholding that occurred on 21 June 2025. The transaction was coded “F,” indicating shares were withheld by the issuer solely to satisfy income-tax obligations stemming from the vesting of previously awarded restricted stock units. No open-market purchase or discretionary sale took place.

Key figures

• Shares withheld (disposed): 10,310 ordinary shares at an imputed price of $3.73 per share (≈ $38 k value).
• Direct holdings after transaction: 45,699 ordinary shares.
• Indirect holdings (Cote 2019 Irrevocable Indenture Trust): 150,600 shares.
• Total beneficial ownership after filing: 196,299 shares.

Because the disposition was for tax settlement, it does not signal a strategic change in Mr. Cote’s investment stance. The director retains the majority of his position, with post-transaction direct ownership declining by roughly 18% (10,310 of 56,009 previously held directly) but overall economic exposure remaining effectively unchanged. The filing is routine, carries no cash proceeds to the insider, and is unlikely to affect Trinseo’s fundamentals or governance profile.

Insights

Insider-Transaction Analyst

TL;DR: Routine tax-withholding; small relative size; neutral signal for investors.

The Code F transaction shows Trinseo withheld 10,310 shares from Director Jeffrey Cote to cover taxes on RSU vesting. Such transactions are mechanical and do not represent discretionary selling pressure. After the withholding, Cote still controls ~196 k shares—over four times his direct stake before 2019 trust transfers—maintaining sizeable alignment with shareholders. Given the modest dollar value (≈ $38 k) and no change in total economic exposure, I classify the filing as neutral for valuation or sentiment purposes.

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^*

COTE JEFFREY J

(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		10,310(1)	D	$3.73	45,699	D
Ordinary Shares								150,600	I(2)	By Cote 2019 Irrevocable Indenture Trust

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.

2. Represents shares held by an irrevocable indenture trust having a disinterested trustee for the benefit of the reporting person and children (the "Cote 2019 Irrevocable Indenture Trust").

	/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 did Director Jeffrey Cote dispose of on 21 June 2025?

The filing shows 10,310 ordinary shares were withheld by the company for tax purposes.

Was the transaction an open-market sale by the Trinseo insider?

No. The Form 4 uses Transaction Code F, which indicates shares were withheld solely to pay taxes on vested RSUs.

What is Jeffrey Cote’s total beneficial ownership in Trinseo after the filing?

He owns 45,699 shares directly and 150,600 shares indirectly, totaling 196,299 shares.

At what price were the withheld Trinseo shares valued?

The shares were valued at $3.73 each for tax-withholding purposes.

Does the Form 4 suggest a change in insider sentiment toward Trinseo stock?

Because the disposition was for tax withholding and not a discretionary sale, it is viewed as neutral and does not signal sentiment change.