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, 2024 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 inco ...

Exhibit 99.1 Contact: Andy Myers Tel : +1 610-240-3221 Email: aemyers@trinseo.com Trinseo Reports First Quarter 2024 Financial Results and Provides Second Quarter Outlook First Quarter 2024 and Other Highlights | | | | Three Months Ended | | | --- | --- | --- | --- | --- | | | | | March 31, | | | $millions, except per share data | 2024 | 2023 | | | | Net Sales | $ | 904 | $ | 996 | | Net Loss | | (76) | | (49) | | Diluted EPS ($) | (2.14) | | | (1.40) | | Adjusted Net Loss* | | (69) | | (35) | | Adjusted EP ...

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, 2023 ☐ 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 organ ...

Trinseo PLC (NYSE:TSE) Q4 2023 Earnings Call Transcript February 13, 2024 10:00 AM ET Company Participants Andy 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 Matthew Blair - TPH Hassan Ahmed - Alembic Global Advisors Laurence Alexander - Jefferies Operator Good morning, ladies and gentlemen, and welcome to the Trinseo Fourth Quarter 2023 Financial Results Conference Call. We welc ...

TRINSEO.. February 12, 2024 Introductions & Disclosure Rules • Frank Bozich, President & CEO • Andy Myers, Director of Investor Relations This presentation may contain forward-looking statements including, without limitation, statements concerning plans, objectives, goals, projections, forecasts, strategies, future events or performance, and underlying assumptions and other statements, which are not statements of historical facts or guarantees or assurances of future performance. Forward-looking statements ...

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 September 30, 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 juri ...

Trinseo PLC (NYSE:TSE) Q3 2023 Earnings Conference Call November 6, 2023 10:00 AM ET Company Participants Andy Myers - Finance Director, Corporate FP&A and IR Frank Bozich - President, CEO & Director David Stasse - EVP, CFO & Interim Principal Accounting Officer Conference Call Participants Frank Mitsch - Fermium Research, LLC David Begleiter - Deutsche Bank Matthew Blair - Tudor, Pickering, Holt & Co. Michael Leithead - Barclays Hassan Ahmed - Alembic Global Advisors Laurence Alexander - Jefferies Operat ...

Trinseo PLC (NYSE:TSE) Q2 2023 Earnings Conference Call August 4, 2023 10:00 AM ET Company Participants Andrew Myers - Finance Director, Corporate FP&A and IR Frank Bozich - President, CEO & Director David Stasse - EVP, CFO & Interim Principal Accounting Officer Conference Call Participants Frank Mitsch - Fermium Research Michael Leithead - Barclays Bank David Begleiter - Deutsche Bank Laurence Alexander - Jefferies Matthew Blair - Tudor, Pickering, Holt & Co. Roger Spitz - Bank of America Merrill Lynch Has ...

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, 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 jurisdict ...

Trinseo PLC (NYSE:TSE) Q1 2023 Earnings Conference Call May 5, 2023 10:00 AM ET Company Participants Andy Myers - Director, Investor Relations Frank Bozich - President & Chief Executive Officer David Stasse - Executive Vice President & Chief Financial Officer Conference Call Participants Stefan Diaz - Morgan Stanley Kevin Estok - Jefferies Priya Ranjan - RBC Operator Good morning, ladies and gentlemen, and welcome to the Trinseo First Quarter 2023 Financial Results Conference Call. We welcome the Trinseo m ...