0001558370-22-007305 Sample Contracts

Trinseo PLC Amended & Restated 2014 Omnibus Incentive Plan Restricted Stock Unit Agreement

Restricted Stock Unit Agreement • May 5th, 2022 • Trinseo PLC • Plastic materials, synth resins & nonvulcan elastomers

• Contract Type
  Restricted Stock Unit Agreement
• Filed
  May 5th, 2022
• Company
  Trinseo PLC
• Industry
  Plastic materials, synth resins & nonvulcan elastomers

This agreement (this “Agreement”) evidences an award (the “Award”) of restricted stock units (the “Restricted Stock Units”) granted by Trinseo PLC (the “Company”) to the undersigned (the “Grantee”) pursuant to the Trinseo PLC Amended and Restated 2014 Omnibus Incentive Plan (as amended from time to time, the “Plan”), which is incorporated herein by reference.

TRINSEO EUROPE GMBH AMENDED AND RESTATED EMPLOYMENT AGREEMENT

Employment Agreement • May 5th, 2022 • Trinseo PLC • Plastic materials, synth resins & nonvulcan elastomers

• Contract Type
  Employment Agreement
• Filed
  May 5th, 2022
• Company
  Trinseo PLC
• Industry
  Plastic materials, synth resins & nonvulcan elastomers

AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this “Agreement”), dated as of October 1, 2021, is among Trinseo Europe GmbH, a Swiss limited liability company (Gesellschaft mit beschrӓnkter Haftung) (the “Company”), and Francesca Reverberi of Bremgartnerstrasse 15, 8003 Zurich, Switzerland (the “Executive”); which amends and restates the previous employment agreement entered into between the parties.

TRINSEO PLC Amended & Restated 2014 Omnibus Incentive Plan Performance Award Stock Unit Agreement

Performance Award Stock Unit Agreement • May 5th, 2022 • Trinseo PLC • Plastic materials, synth resins & nonvulcan elastomers

• Contract Type
  Performance Award Stock Unit Agreement
• Filed
  May 5th, 2022
• Company
  Trinseo PLC
• Industry
  Plastic materials, synth resins & nonvulcan elastomers

This agreement (this “Agreement”) evidences an award (the “Award”) of restricted stock units subject to performance conditions (hereinafter referred to as Performance Award Stock Units or “PSUs”) granted by Trinseo PLC (the “Company”) to the undersigned (the “Grantee”) pursuant to the Trinseo PLC Amended & Restated 2014 Omnibus Incentive Plan (as amended from time to time, the “Plan”), which is incorporated herein by reference.

TRINSEO PLC Amended & Restated 2014 Omnibus Incentive Plan Non-Statutory Stock Option Agreement

Non-Statutory Stock Option Agreement • May 5th, 2022 • Trinseo PLC • Plastic materials, synth resins & nonvulcan elastomers

• Contract Type
  Non-Statutory Stock Option Agreement
• Filed
  May 5th, 2022
• Company
  Trinseo PLC
• Industry
  Plastic materials, synth resins & nonvulcan elastomers

This agreement (this “Agreement”) evidences an award (the “Award”) of a stock option (the “Stock Option”) granted by Trinseo PLC (the “Company”) to the undersigned (the “Optionee”) pursuant to and subject to the terms of the Trinseo PLC Amended and Restated 2014 Omnibus Incentive Plan (as amended from time to time, the “Plan”).