Trinseo (TSE) Form 4: Desmond Receives 42k RSUs on 25-Jun-25

Rhea-AI Filing Summary

Trinseo PLC (TSE) – Form 4 filed 27 Jun 2025

Director Jeanmarie F. Desmond reported the grant of 42,484 ordinary shares on 25 Jun 2025 via a restricted stock unit (RSU) award. The RSUs were acquired at $0 cost and will vest in full one year from the grant date. After the award, Desmond’s total beneficial ownership rises to 89,036 ordinary shares, all held directly. No sales, option exercises, or other derivative transactions were disclosed. The filing reflects routine director equity compensation intended to align interests with shareholders; it does not involve an open-market purchase, cash expenditure, or indicate any change in control.

Positive

• Director’s beneficial ownership increases to 89,036 shares, modestly improving management–shareholder alignment.

Negative

• Shares were granted, not purchased, so the filing lacks a traditional insider buying signal and introduces minor dilution.

Insights

Corporate Governance Specialist

TL;DR – Routine director RSU grant; mildly positive alignment, immaterial to fundamentals.

The Form 4 shows Trinseo awarded Director Jeanmarie Desmond 42,484 RSUs, boosting her direct stake to 89,036 shares. Because RSUs vest in one year and carry no purchase price, the transaction is standard board compensation rather than an opportunistic buy. It marginally improves insider alignment but has no immediate cash signal or large dilutive impact relative to Trinseo’s share count. Investors should view the filing as governance-related housekeeping rather than a catalyst.

Portfolio Manager

TL;DR – Neutral event; negligible dilution, no market-moving information.

The additional 42.5k shares equate to less than 0.1 % of TSE’s outstanding float, so dilution risk is minimal. Since the shares were granted, not bought, the filing lacks the bullish purchasing signal some investors seek. Nevertheless, continued equity-based compensation helps align board incentives with long-term shareholder value. I therefore classify the impact as neutral for trading decisions.

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^*

Desmond Jeanmarie F.

(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)
06/25/2025

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	06/25/2025		A		42,484(1)	A	$0	89,036	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. Represents ordinary shares issuable pursuant to a restricted stock unit award that will vest in full on the first anniversary of the grant date.

	/s/ Angelo Chaclas, Attorney-in-Fact	06/27/2025
	** 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 June 2025 Form 4?

Director Jeanmarie F. Desmond received 42,484 RSUs on 25 Jun 2025.

How many Trinseo shares does Jeanmarie Desmond own after the RSU grant?

Her direct beneficial ownership increased to 89,036 ordinary shares.

When will the newly granted RSUs vest?

They vest in full one year after the 25 Jun 2025 grant date.

Did the director pay for the shares?

No. The RSUs were acquired at $0 cost as part of compensation.

Were any open-market purchases or sales reported?

No. The Form 4 lists only the RSU grant; no market trades occurred.