TSE 10-Q Quarterly Report March 31, 2021

TRINSEO S.A.

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TABLE OF CONTENTS

Part I Financial Informatio Item 1. Financial Statements Note 1 Basis Of Presentation Note 2 Recent Accounting Guidance Note 3 Net Sales Note 4 Investments in Unconsolidated Affiliates Note 5 Inventories Note 6 Debt Note 7 Goodwill Note 8 Derivative Instruments Note 9 Fair Value Measurements Note 10 Provision For Income Taxes Note 11 Commitments and Contingencies Note 12 Pension Plans and Other Postretirement Benefits Note 13 Share-based Compensation Note 14 Acquisitions and Divestitures Note 15 Segments Note 16 Restructuring Note 17 Accumulated Other Comprehensive Income (loss)Note 18 Earnings Per Share Item 2. Management S Discussion and Analysis Of Financial Condition and Results Of Operations Item 2. Management S Discussio Item 3. Quantitative and Qualitative Disclosures About Market Risk Item 3. Quantitative and Qualitativ Item 4. Controls and Procedures Part II Other Information Item 1. Legal Proceedings Item 1. Legal Proceeding Item 1A. Risk Factors Item 2. Unregistered Sales Of Equity Securities and Use Of Proceeds Item 3. Defaults Upon Senior Securities Item 4. Mine Safety Disclosures Item 5. Other Information Item 6. Exhibits

Exhibits

2.1 Share Purchase Agreement, by and between Trinseo S.A. and Arkema S.A., dated March 19, 2021 (incorporated by reference to Exhibit 2.1 to the Current Report on Form 8-K filed March 22, 2021) 2.2* 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 19, 2021 3.1 Amended and Restated Articles of Association of Trinseo S.A., as amended (incorporated herein by reference to Exhibit 3.1 to the Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, filed August 3, 2018) 4.1 Form of Specimen Share Certificate of Trinseo S.A. (incorporated herein by reference to Exhibit 4.1 to Amendment No. 3 to the Registration Statement filed on Form S-1, File No. 333-194561, filed May 16, 2014) 4.2 Indenture among Trinseo Materials Operating S.C.A., Trinseo Materials Finance, Inc. and The Bank of New York Mellon, as Trustee, dated as of August 29, 2017 (incorporated herein by reference to Exhibit 4.1 to the Current Report on Form 8-K, filed September 5, 2017) 4.3 Indenture among Trinseo Materials Operating S.C.A., Trinseo Materials Finance, Inc. and The Bank of New York Mellon, as Trustee, dated as of March 24, 2021 (incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K filed March 24, 2021) 10.1 Warranty Agreement, by and between Trinseo S.A. and Arkema S.A., dated March 19, 2021 (incorporated by reference to Exhibit 10.1 to the Current Report on Form 8-K filed March 22, 2021) 10.2 Employment Agreement between Trinseo Europe GmbH and Andre Lanning, dated May 1, 2020 31.1 Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 31.2 Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 32.1 Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 32.2 Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

TSE 10-Q Quarter ended March 31, 2021

Exhibits