Trinseo (TSE) Form 4 Trinseo / ALICE HEEZEN ownership change

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).

1. Name and Address of Reporting Person^*

HEEZEN ALICE

(Last) (First) (Middle)

C/O TRINSEO S.A.

1000 CHESTERBROOK BOULEVARD, SUITE 300

(Street)

BERWYN PA 19312

(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 - Human Resources

3. Date of Earliest Transaction (Month/Day/Year)
11/12/2021

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	11/12/2021		M		6,443	A	$24.3	18,262	D
Ordinary Shares	11/12/2021		M		5,363	A	$51.02	23,625	D
Ordinary Shares	11/12/2021		S(1)		11,806	D	$57.75(2)	11,819	D
Ordinary Shares	11/12/2021		S		1,738	D	$57.94(3)	10,081	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
Option to Purchase Ordinary Shares	$24.3	11/12/2021		M			6,443	(4)	02/25/2029	Ordinary Shares	6,443	$0	12,887	D
Option to Purchase Ordinary Shares	$51.02	11/12/2021		M			5,363	(4)	02/26/2028	Ordinary Shares	5,363	$0	2,682	D

Explanation of Responses:

1. A portion of the proceeds from the sale were used to pay the exercise price of stock options pursuant to a broker-assisted cashless exercise, and applicable withholding taxes.

2. Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $57.75 to $57.79. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

3. Price reflects the weighted average sale price for the sale transactions made on the date reported above. Sale prices ranged from $57.93 to $58.00. The reporting person will provide, upon request by the Staff, the Company, or a security holder of the Company, full information regarding the number of shares purchased or sold at each separate price.

4. Options will vest in three equal annual installments beginning on the first anniversary of the grant date.

	/s/ Angelo Chaclas, attorney-in-fact	11/16/2021
	** 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).
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