Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-36473 Trinseo PLC (Exact name of registrant as specified in its charter) Ireland N/A (State or other jurisdic ...

First Quarter 2023 Financial Results & Full-Year Outlook May 4, 2023 ™Trademark of Trinseo PLC or its affiliates Introductions & Disclosure Rules Introductions • Frank Bozich, President & CEO • David Stasse, Executive Vice President & CFO • Andy Myers, Director of Investor Relations Disclosure Rules This press release may contain forward-looking statements including, without limitation, statements concerning plans, objectives, goals, projections, forecasts, strategies, future events or performance, and unde ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended: December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-36473 Trinseo PLC (Exact name of registrant as specified in its charter) Ireland N/A (State or other jurisdiction of incorporat ...

Trinseo PLC (NYSE:TSE) Q4 2022 Results Conference Call February 9, 2023 10:00 AM ET Company Participants Andy Myers - Finance Director of Corporate FP&A and IR Frank Bozich - President, CEO and Director David Stasse - Executive VP and CFO Conference Call Participants Matthew Blair - TPH Frank Mitsch - Fermium Research David Begleiter - Deutsche Bank Michael Leithead - Barclays Dan Rizzo - Jefferies Stefan Diaz - Morgan Stanley Hassan Ahmed - Alembic Global Investors Eric Petrie - Citi Operator Good morning, ...

Third Quarter 2022 Financial Results & Full-Year 2022 Outlook November 2, 2022 ™Trademark of Trinseo PLC or its affiliates Introductions & Disclosure Rules Introductions • Frank Bozich, President & CEO • David Stasse, Executive Vice President & CFO • Andy Myers, Director of Investor Relations Disclosure Rules Cautionary Note on Forward-Looking Statements.This presentation may contain forward-looking statements including, without limitation, statements concerning plans, objectives, goals, projections, foreca ...

Trinseo PLC (NYSE:TSE) Q3 2022 Earnings Conference Call November 3, 2022 10:00 AM ET Company Participants Andrew Myers - Finance Director, Corporate FP&A & IR Frank Bozich - President, CEO & Director David Stasse - EVP & CFO Conference Call Participants David Begleiter - Deutsche Bank Frank Mitsch - Fermium Research Michael Leithead - Barclays Bank Hassan Ahmed - Alembic Global Advisors Eric Petrie - Citi Angel Castillo - Morgan Stanley Operator Good morning, ladies and gentlemen, and welcome to the Trinseo ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q For the quarterly period ended September 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-36473 Trinseo PLC (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE S ...

Second Quarter 2022 Financial Results & Outlook August 8, 2022 ™Trademark of Trinseo PLC or its af f iliates Introductions & Disclosure Rules Introductions • Frank Bozich, President & CEO • David Stasse, Executive Vice President & CFO • Andy Myers, Director of Investor Relations Disclosure Rules Cautionary Note on Forward-Looking Statements.This presentation may contain forward-looking statements including, without limitation, statements concerning plans, objectives, goals, projections, forecasts, strategie ...

Trinseo PLC (NYSE:TSE) Q2 2022 Earnings Conference Call August 9, 2022 10:00 AM ET Company Participants Andrew Myers - Director of IR Frank Bozich - President and CEO David Stasse - EVP and CFO Conference Call Participants Frank Mitsch - Fermium Research David Begleiter - Deutsche Bank Mike Leithead - Barclays Hassan Ahmed - Alembic Global Advisors Angel Castillo - Morgan Stanley Matthew Blair - Tudor, Pickering, Holt and Company Eric Petrie - Citi Operator Good morning, ladies and gentlemen and welcome to ...

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-36473 Trinseo PLC (Exact name of registrant as specified in its charter) (State or other jurisdiction of incor ...