Trinseo S.A. Contracts & Agreements

Form of Retention Award Agreement (Filed With SEC on February 27, 2024)

Description of Securities (Filed With SEC on February 23, 2024)

First Amendment to Credit Agreement, dated January 26, 2024, to the Credit Agreement dated as of September 8, 2023 among Trinseo Luxco SARL, Trinseo NA Finance LLC, Trinseo Luxco... (Filed With SEC on February 23, 2024)

Credit Agreement, dated as of September 8, 2023, among Trinseo Luxco SARL, Trinseo NA Finance LLC, Trinseo Luxco Finance SPV SARL, Trinseo NA Finance SPV LLC, the guarantors party... (Filed With SEC on September 8, 2023)

Separation Agreement with Andre Lanning dated July 18, 2023 (Filed With SEC on July 20, 2023)

Trinseo PLC Amended and Restated 2014 Omnibus Incentive Plan (as amended) (Filed With SEC on June 16, 2023)

Employment Agreement between Trinseo LLC and Paula Cooney, dated October 15, 2021 (Filed With SEC on May 5, 2023)

Amendment, dated May 9, 2022, to the Employment Agreement between Trinseo LLC and Paula Cooney dated October 15, 2021 (Filed With SEC on May 5, 2023)

Description of Securities (Filed With SEC on February 27, 2023)

Form of Restricted Stock Unit Agreement for Directors (Filed With SEC on February 27, 2023)

Amendment, dated May 9, 2022, to the Employment Agreement between Trinseo LLC and Frank Bozich dated December 11, 2018 (Filed With SEC on August 9, 2022)

Amendment, dated May 9, 2022, to the Employment Agreement between Trinseo LLC and David Stasse dated April 29, 2019 (Filed With SEC on August 9, 2022)

Amendment, dated May 9, 2022, to the Employment Agreement between Trinseo LLC and Angelo Chaclas dated January 1, 2020 (Filed With SEC on August 9, 2022)

Amendment, dated May 9, 2022, to the Employment Agreement between Trinseo Europe GmbH and Andre Lanning dated October 1, 2021 (Filed With SEC on August 9, 2022)

Amendment, dated May 9, 2022, to the Employment Agreement between Trinseo Europe GmbH and Francesca Reverberi dated October 1, 2021 (Filed With SEC on August 9, 2022)

Trinseo PLC Amended and Restated 2014 Omnibus Incentive Plan (Filed With SEC on June 17, 2022)

Employment Agreement between Trinseo Europe GmbH and Francesca Reverberi dated October 1, 2021 (Filed With SEC on May 5, 2022)

Form of Restricted Stock Unit Award Agreement (Filed With SEC on May 5, 2022)

Form of Stock Option Award Agreement (Filed With SEC on May 5, 2022)

Form of Performance Award Stock Unit Agreement (Filed With SEC on May 5, 2022)

Description of Securities (Filed With SEC on February 23, 2022)

Trinseo PLC Amended and Restated 2014 Omnibus Incentive Plan (Filed With SEC on February 23, 2022)

Form of Restricted Stock Unit Award Agreement (Filed With SEC on February 23, 2022)

Form of Non-statutory Stock Option Award Agreement (Filed With SEC on February 23, 2022)

Form of Performance Award Stock Unit Agreement (Filed With SEC on February 23, 2022)

Amendment, dated February 17, 2022, to the Employment Agreement between Trinseo Europe GmbH and Andre Lanning dated October 1, 2021 (Filed With SEC on February 23, 2022)

Form of Indemnification Agreement for Directors and Officers (Filed With SEC on November 8, 2021)

Employment Agreement between Trinseo Europe GmbH and Andre Lanning dated October 1, 2021 (Filed With SEC on November 8, 2021)

Form of Restricted Stock Unit Award Agreement to certain former Arkema employees (Filed With SEC on November 8, 2021)

Form of Stock Option Award Agreement to certain former Arkema employees (Filed With SEC on November 8, 2021)

Amendment Agreement, dated October 21, 2021, to Asset Purchase Agreement, by and between Trinseo PLC, Trinseo Deutschland GmbH, Trinseo Europe GmbH, Trinseo Belgium B.V.B.A.,... (Filed With SEC on November 8, 2021)

Separation Agreement with Alice Heezen dated October 25, 2021 (Filed With SEC on October 27, 2021)

Purchase and Sale Agreement by and among Trinseo US Holding, Inc., Trinseo Europe GmbH, Trinseo S.A., Aristech Surfaces LLC and SK AA Holdings, LLC dated July 19, 2021 (Filed With SEC on July 21, 2021)

Asset Purchase Agreement, by and between Trinseo S.A., Trinseo Deutschland GmbH, Trinseo Europe GmbH, Trinseo Belgium B.V.B.A., Trinseo Export GmbH, and Synthos S.A., Blitz... (Filed With SEC on May 25, 2021)

Benzene Sales Contract, between Dow Europe GmbH and Trinseo Europe GmbH, dated May 6, 2021 (Filed With SEC on May 14, 2021)

Amendatory Agreement dated May 3, 2021, in respect of the Share Purchase Agreement by and between Arkema S.A. and Arkema France S.A., on the one hand and Trinseo S.A. dated March... (Filed With SEC on May 7, 2021)

Employment Agreement between Trinseo Europe GmbH and Andre Lanning, dated May 1, 2020 (Filed With SEC on May 7, 2021)

Share Purchase Agreement, by and between Trinseo S.A. and Arkema S.A., dated March 19, 2021 (Filed With SEC on March 22, 2021)

Warranty Agreement, by and between Trinseo S.A. and Arkema S.A., dated March 19, 2021 (Filed With SEC on March 22, 2021)

Letter agreement between Trinseo LLC and Frank A. Bozich concerning voluntary reduction of salary (Filed With SEC on February 22, 2021)

Letter agreement between Trinseo LLC and David Stasse concerning voluntary reduction of salary (Filed With SEC on February 22, 2021)

Letter agreement between Trinseo LLC and Angelo N. Chaclas concerning voluntary reduction of salary (Filed With SEC on February 22, 2021)

Amendment No. 3 to the Amended and Restated MOD5 Computerized Process Control Software Agreement, Licenses and Services, between Rofan Services Inc. and Trinseo LLC (f/k/a Styron... (Filed With SEC on February 22, 2021)

Form of Restricted Stock Unit Agreement for Directors (Filed With SEC on February 22, 2021)

Form of Restricted Stock Unit Award Agreement (Filed With SEC on February 22, 2021)

Form of Non-statutory Stock Option Award Agreement (Filed With SEC on February 22, 2021)

Form of Performance Award Stock Unit Agreement (Filed With SEC on February 22, 2021)

Put Option Agreement, by and between Trinseo S.A. and Arkema S.A. dated December 14, 2020 (Filed With SEC on December 17, 2020)

Ethylene Sales Contract (Boehlen), between Dow Europe GmbH and Trinseo Europe GmbH, dated October 30, 2020 (Filed With SEC on October 30, 2020)

Ethylene Sales Contract (Terneuzen), between Dow Europe GmbH and Trinseo Europe GmbH, dated October 30, 2020 (Filed With SEC on October 30, 2020)

Butadiene Sales Contract (Europe), between Dow Europe GmbH and Trinseo Europe GmbH, dated June 29, 2020 (Filed With SEC on July 2, 2020)

Agreement between Trinseo, LLC and Angelo Chaclas dated January 1, 2020 (Filed With SEC on May 8, 2020)

Agreement between Timothy Stedman and Trinseo Europe GmbH dated January 1, 2020 (Filed With SEC on May 8, 2020)

Separation Agreement between Timothy Stedman and Trinseo Europe GmbH, dated April 10, 2020 (Filed With SEC on April 15, 2020)

Description of Securities (Filed With SEC on February 28, 2020)

Separation Agreement between Hayati Yarkadas and Trinseo Europe GmbH, dated October 2, 2019 (Filed With SEC on October 3, 2019)

Letter Agreement Amendment to the Employment Agreement between Timothy Stedman and Trinseo Europe GmbH, dated October 2, 2019 (Filed With SEC on October 3, 2019)

Employment Agreement between Trinseo Europe GmbH and Alice Heezen-Dokianos dated June 3, 2019 (Filed With SEC on August 9, 2019)

Form of Executive Side Letter for Equity Grants (Filed With SEC on August 9, 2019)

Employment Agreement between Trinseo LLC and David Stasse, dated April 29, 2019 (Filed With SEC on April 30, 2019)

Employment Agreement between Trinseo LLC and Frank A. Bozich (Filed With SEC on January 30, 2019)

Amendment to Employment Agreement between Trinseo US Holding, Inc., Trinseo S.A. and Christopher D. Pappas, dated December 20, 2018 (Filed With SEC on December 21, 2018)

Form of Performance Award Stock Unit Agreement for Executives for 2018 Executive Retention Awards (Filed With SEC on September 17, 2018)

Amended and Restated Employment Agreement among Trinseo US Holding, Inc., Trinseo S.A., and Christopher D. Pappas, dated December 21, 2017 (Filed With SEC on May 3, 2018)

Employment Agreement between Trinseo Europe GmbH and Alice Heezen, dated March 26, 2018 (Filed With SEC on May 3, 2018)

Form of Restricted Stock Unit Award Agreement for Executives (Filed With SEC on May 3, 2018)

Form of Non-Statutory Stock Option Award Agreement for Executives (Filed With SEC on May 3, 2018)

Form of Performance Award Stock Unit Agreement for Executives (Filed With SEC on May 3, 2018)

Form of Restricted Stock Unit Award Agreement for Employees (Filed With SEC on May 3, 2018)

Form of Non-Statutory Stock Option Award Agreement for Employees (Filed With SEC on May 3, 2018)

Retention Award Letter Agreement, dated December 21, 2017, between Trinseo US Holding, Inc., Trinseo LLC and Marilyn Horner (Filed With SEC on March 1, 2018)

Amended and Restated Employment Agreement between Trinseo US Holding, Inc. and Christopher D. Pappas, dated December 21, 2017 (Filed With SEC on December 28, 2017)

First Supplemental Indenture among Trinseo Materials Operating S.C.A., Trinseo Materials Finance, Inc., the Guarantors named therein, and The Bank of New York Mellon, as Trustee,... (Filed With SEC on August 3, 2017)

Second Supplemental Indenture among Trinseo Materials Operating S.C.A., Trinseo Materials Finance, Inc., the Guarantors named therein, and The Bank of New York Mellon, as Trustee,... (Filed With SEC on August 3, 2017)

Form of Indemnification Agreement for Directors and Officers (Filed With SEC on August 3, 2017)

TRINSEO S.A. 2014 Omnibus Incentive Plan Restricted Stock Unit Agreement (Non-Employee Directors) (Filed With SEC on May 3, 2017)

TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT (Filed With SEC on May 3, 2017)

TRINSEO S.A. 2014 Omnibus Incentive Plan NON-STATUTORY STOCK OPTION AGREEMENT (Filed With SEC on May 3, 2017)

TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN PERFORMANCE AWARD STOCK UNIT AGREEMENT (Filed With SEC on May 3, 2017)

TRINSEO S.A. 2014 Omnibus Incentive Plan RESTRICTED STOCK UNIT AGREEMENT (Filed With SEC on May 3, 2017)

TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN NON-STATUTORY STOCK OPTION AGREEMENT (Filed With SEC on May 3, 2017)

Trinseo S.A. Ordinary Shares, Nominal Value $0.01 Underwriting Agreement (Filed With SEC on September 21, 2016)

Trinseo S.A. Ordinary Shares, Nominal Value $0.01 Underwriting Agreement (Filed With SEC on August 12, 2016)

TRINSEO LLC EMPLOYMENT AGREEMENT (Filed With SEC on May 23, 2016)

Trinseo S.A. Ordinary Shares, Nominal Value $0.01 Underwriting Agreement (Filed With SEC on May 11, 2016)

FIRST AMENDMENT TO AMENDED & RESTATED EMPLOYMENT AGREEMENT (Filed With SEC on April 5, 2016)

Trinseo S.A. Ordinary Shares, Nominal Value $0.01 Underwriting Agreement (Filed With SEC on March 24, 2016)

BAIN CAPITAL EVEREST US HOLDING, INC. EMPLOYMENT AGREEMENT (Filed With SEC on March 11, 2016)

TRINSEO EUROPE GMBH EMPLOYMENT AGREEMENT (Filed With SEC on March 11, 2016)

Bain Capital Everest US Holding, Inc. (Filed With SEC on November 18, 2015)

THIRD AMENDMENT TO THE TRINSEO US HOLDING, INC. (formerly known as STYRON US HOLDING, INC.) EMPLOYMENT AGREEMENT (Filed With SEC on October 8, 2015)

TRINSEO S.A. 2014 Omnibus Incentive Plan Restricted Stock Unit Agreement (Filed With SEC on August 7, 2015)

TRINSEO S.A. 2014 Omnibus Incentive Plan Non-statutory Stock Option Agreement (Filed With SEC on August 7, 2015)

TRINSEO MATERIALS OPERATING S.C.A. and TRINSEO MATERIALS FINANCE,INC. and THE BANK OF NEWYORK MELLON as Trustee 6.750% Dollar Notes due 2022 6.375% Euro Notes due 2022 INDENTURE... (Filed With SEC on May 11, 2015)

SEPARATION AND GENERAL RELEASE AGREEMENT (Filed With SEC on March 10, 2015)

BAIN CAPITAL EVEREST US HOLDING, INC. EMPLOYMENT AGREEMENT (Filed With SEC on March 10, 2015)

AMENDMENT NO. 1 TO EMPLOYMENT AGREEMENT (Filed With SEC on March 10, 2015)

SECONDAMENDMENT TO THE STYRON US HOLDING, INC. EMPLOYMENT AGREEMENT (Filed With SEC on March 10, 2015)

TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT (Filed With SEC on March 5, 2015)

TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN NON-STATUTORY STOCK OPTION AGREEMENT (Filed With SEC on March 5, 2015)

FIFTH SUPPLEMENTAL INDENTURE (Filed With SEC on August 11, 2014)

Trinseo S.A. Ordinary Shares,Nominal Value $0.01 Underwriting Agreement (Filed With SEC on June 9, 2014)

1000 ChesterbrookBoulevard, Suite 300, Berwyn, PA 19312 (Filed With SEC on June 2, 2014)

TRINSEO S.A. 2014 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT AGREEMENT (NON-EMPLOYEEDIRECTORS) (Filed With SEC on June 2, 2014)

Styron LLC 1000 ChesterbrookBlvd, Suite 300 Berwyn, Pennsylvania 19312 May 30, 2014 (Filed With SEC on June 2, 2014)

Trinseo S.A. Ordinary Shares,Par Value $0.01 Underwriting Agreement (Filed With SEC on May 16, 2014)

Additional abbreviations may also be used though not in the above list. (Filed With SEC on May 16, 2014)

TRINSEO S.A. 2014OMNIBUS INCENTIVE PLAN (Filed With SEC on May 16, 2014)

TRINSEO S.A. CASHINCENTIVE PLAN (Filed With SEC on May 16, 2014)

Additional abbreviations may also be used though not in the above list. (Filed With SEC on May 5, 2014)

AMENDED AND RESTATED REGISTRATION RIGHTS AGREEMENT (Filed With SEC on May 5, 2014)

Styron Restoration andElective Deferral Plan Effective July 1, 2011 TABLE OF CONTENTS (Filed With SEC on May 5, 2014)

Styron Performance Award (PA) Plan (Filed With SEC on May 5, 2014)

TRINSEO S.A. 2014OMNIBUS INCENTIVE PLAN (Filed With SEC on May 5, 2014)

TRINSEO S.A. CASHINCENTIVE PLAN (Filed With SEC on May 5, 2014)

INDEMNIFICATION AGREEMENT (Filed With SEC on May 5, 2014)

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Trinseo S.A. Contracts & Agreements