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 ...

First Quarter 2022 Financial Results & Outlook May 4, 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, forecasts, strategies, fut ...

Trinseo PLC (NYSE:TSE) Q1 2022 Earnings Conference Call May 5, 2022 10:00 AM ET Company Participants Andrew Myers - Director of Investor Relations Frank Bozich - President and Chief Executive Officer David Stasse - Executive Vice President and Chief Financial Officer Conference Call Participants Frank Mitsch - Fermium Research David Begleiter - Deutsche Bank Hassan Ahmed - Alembic Global Advisors Lawrence Alexander - Jeffries Angel Castillo - Morgan Stanley Matthew Blair - Tudor, Pickering, Holt & Company O ...

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, 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 inco ...

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, 2021 ☐ 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 ...

Fourth Quarter 2021 Financial Results & 2022 Outlook February 8, 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, forecasts, stra ...

Financial Data and Key Metrics Changes - In 2021, the company achieved record profitability with net income of $440 million and adjusted EBITDA of $729 million [8] - For the full year, net income from continuing operations was $280 million, and adjusted EBITDA was $729 million, with cash from operations of $453 million and free cash flow of $329 million [25][26] Business Line Data and Key Metrics Changes - The Engineered Materials segment's adjusted EBITDA was about $25 million lower than expected due to increased natural gas costs and higher raw materials and freight costs [24] - The company expects earnings in the first quarter of 2022 to be similar to the prior year, driven by continued demand strength and improved pricing actions [28] Market Data and Key Metrics Changes - The company noted robust demand for many products, particularly in ABS, polycarbonate, and polystyrene, despite challenges from external factors [19] - The automotive sector is experiencing constraints due to chip shortages, impacting overall demand [30] Company Strategy and Development Direction - The company is transforming into a specialty materials and sustainable solutions provider, with acquisitions aimed at enhancing product offerings and entering new markets [9][10] - The acquisition of Heathland B.V. aligns with the company's sustainability goals and aims to secure a steady supply of recycled feedstocks [12][13] Management's Comments on Operating Environment and Future Outlook - Management acknowledged challenges in 2021 due to external factors like weather events and COVID-19, but expressed confidence in overcoming these obstacles [16] - The company anticipates continued strong cash generation in 2022, with expected cash from operations of $530 million to $580 million [32] Other Important Information - The company plans to increase its quarterly dividend from $0.08 to $0.32 per share and has reinstated its share repurchase program [26] - The company is focusing on organic growth in sustainable products, with a significant increase in sales volume of recycled products [15] Q&A Session Summary Question: Timing and interest in the Styrenics divestiture - Management expects good interest from strategic buyers, regional players, and financial sponsors, with updates on timing to come in future quarters [36][37] Question: Buyback program expectations for 2022 - The buyback program will be opportunistic, with expectations for a similar amount to the $48 million buyback in Q4 2021 [38] Question: Sustainable margins in Engineered Materials - Management indicated that Q4 margins were impacted by external factors, but pricing actions taken should improve margins moving forward [41][44] Question: Heathland acquisition's role in recycling strategy - The acquisition is crucial for securing a steady stream of recycled feedstock, with expectations for significant growth in sustainable solutions by 2030 [55][57] Question: Capital expenditures for the new portfolio - Maintenance CapEx is estimated at $50 million to $60 million for the new portfolio, with additional spending on ERP implementation and manufacturing upgrades [58][60] Question: Future profitability of ABS and polycarbonate - Management expects slightly lower earnings in 2022 compared to 2021 due to the relaxation of supply chain constraints, but healthy end demand remains [70] Question: PMMA market dynamics - Management does not see PMMA as cyclical but rather as a solution-driven market with opportunities for growth through material substitution [74][80] Question: Sustainability targets post-Styrenics divestiture - The company aims to maintain its sustainability target of 30% of its portfolio being sustainably advantaged, even after the divestiture [96]

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, 2021 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 ...