FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                       
1. Name and Address of Reporting Person * van Kessel Bregje 2. Date of Event Requiring Statement (MM/DD/YYYY)
11/1/2022 

 3. Issuer Name and Ticker or Trading Symbol Trinseo PLC [TSE]
(Last)        (First)        (Middle)
C/O TRINSEO PLC, 440 EAST SWEDESFORD ROAD, SUITE 301		 4. Relationship of Reporting Person(s) to Issuer (Check all applicable)_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
SVP, Base Plastics /
(Street)
WAYNE, PA 19087      
(City)              (State)              (Zip)
 5. If Amendment, Date Original Filed(MM/DD/YYYY)
 

 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Ordinary Shares  5959 (1) D   

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(MM/DD/YYYY)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Options to Purchase Ordinary Shares   (2) 2/26/2027  Ordinary Shares  1553  $51.02  D   
Options to Purchase Ordinary Shares   (3) 2/25/2028  Ordinary Shares  4616  $24.30  D   
Options to Purchase Ordinary Shares   (4) 2/17/2029  Ordinary Shares  1473  $61.06  D   
Options to Purchase Ordinary Shares   (5) 2/16/2030  Ordinary Shares  1457  $58.64  D   

Explanation of Responses:
(1)  Includes (i) 2,908 ordinary shares issuable pursuant to RSU awards that will vest in full on February 25, 2023, (ii) 1,295 ordinary shares issuable pursuant to RSU awards that will vest in full on February 17, 2024, and (iii) 1,316 ordinary shares issuable pursuant to RSU awards that will vest in full on February 16, 2025.
(2)  The options vest in three equal annual installments beginning on February 26, 2020.
(3)  The options vest in three equal annual installments beginning on February 25, 2021.
(4)  The options vest in three equal annual installments beginning on February 17, 2022.
(5)  The options vest in three equal annual installments beginning on February 16, 2023.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
van Kessel Bregje
C/O TRINSEO PLC
440 EAST SWEDESFORD ROAD, SUITE 301
WAYNE, PA 19087

SVP, Base Plastics

Signatures
/s/ Erik Johnson, attorney-in-fact 11/4/2022
**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 5(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 control number.
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