Trinseo (TSE) came out with a quarterly loss of $1.46 per share versus the Zacks Consensus Estimate of a loss of $1.09. This compares to loss of $1.92 per share a year ago. These figures are adjusted for non-recurring items. This quarterly report represents an earnings surprise of -33.94%. A quarter ago, it was expected that this plastics and latex maker would post a loss of $2.07 per share when it actually produced a loss of $1.94, delivering a surprise of 6.28%. Over the last four quarters, the company ha ...

Trinseo PLC (TSE) — a specialty material solutions provider — announced the opening of its polymethyl methacrylate (PMMA) depolymerization facility in Rho, Italy. This pilot facility marks a significant advancement in the company's commitment to sustainability, leveraging next-generation recycling technology to promote a circular infrastructure for acrylic solutions, in line with Trinseo's 2030 Sustainable Product Portfolio Goals. Trinseo expressed enthusiasm about the new facility, stating that it represen ...

Europe Asia 5 Q1'24 Q1'23 6 U.S. 4 • Styrene purchased via a mix of spot and contract prices • Q1 price increase contributed to working capital build, the majority of which we believe will reverse over the balance of the year Net Sales & Net Income ($MM) Q1'24 Q1'23 Net Sales Net Income Adjusted EBITDA* ($MM) Engineered Materials $4 ($12) Q1'24 Q1'23 Vol Price FX Total 3% (12%) 1% (8%) • Higher year-over-year volumes in paper & board applications, primarily in Asia Pacific • Adjusted EBITDA was $2 million a ...

Financial Data and Key Metrics Changes - The first quarter adjusted EBITDA was $45 million, in line with previous guidance, including $13 million of favorable net timing from rising styrene prices [35][36] - Cash used in operations during the quarter was $66 million, resulting in free cash flow of negative $82 million, attributed to a $61 million increase in trade working capital [53] - The company ended the quarter with $171 million of cash and $423 million of liquidity, including undrawn bank facilities [54] Business Line Data and Key Metrics Changes - Engineering materials are expected to generate above $20 million in EBITDA for Q2, reflecting a recovery in demand [59] - The MMA market saw margin expansion due to supply tightness, with March prices significantly higher in Europe [46] - The company anticipates a favorable mix in 2024, with engineering materials growing faster than the broader portfolio [71] Market Data and Key Metrics Changes - European spot styrene prices increased by about 60% in Q1 due to industry outages, leading to margin expansion at America’s Styrenics [35] - The MMA market in Europe is currently net short, with demand for architectural coatings tightening the market [48] - The company is about 20% below historical run rate volumes compared to normal demand, indicating potential for recovery [97] Company Strategy and Development Direction - The company is committed to integrating modern recycling technologies and has seen a record amount of products containing recycled material sold in Q1, a 65% increase over the prior year [33] - A sale process for the company’s interest in America’s Styrenics has commenced, with expectations for a definitive agreement by early 2025 [32] - The company plans to close its virgin polycarbonate production line in Germany due to soft demand and price declines, while continuing to focus on sustainable product offerings [32][50] Management's Comments on Operating Environment and Future Outlook - Management expressed confidence in the positive earnings momentum continuing into Q2, supported by tightness in styrene and MMA markets [55] - The company remains cautious about the overall demand environment, indicating that Q1 profitability is expected to be the low point of the year [36] - Management noted that while there are signs of improvement, the overall market remains challenging, and they are prioritizing liquidity [56] Other Important Information - The company has engaged local works council in Germany regarding the potential closure of its polycarbonate production line, reflecting ongoing challenges in the market [32] - The company is taking actions to moderate lower margin sales to conserve working capital, with minimal impact on earnings [54] Q&A Session All Questions and Answers Question: Can you quantify the impact of the turnaround in Q1? - The impact of the turnaround was approximately $8 million in earnings, with styrene prices not accelerating until March [62] Question: What kind of interest are you seeing in marketing the AmSty JV? - There has been interest from several strategic and financial parties, but active marketing has not yet begun [81] Question: How do you characterize the mix as volumes rise? - The company expects a favorable mix with higher margin product sales as volumes rise, particularly in engineering materials [59][71] Question: How far below normal levels is demand currently? - The company is about 20% below historical run rate volumes, with a potential $25 million per quarter EBITDA impact for every 10% recovery [97]

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 ...

Financial Data and Key Metrics Changes - The company successfully refinanced $1.1 billion in near-term maturities until 2028, contributing to a $47 million year-over-year increase in cash on the balance sheet [1] - The company generated cash from operations of $149 million and free cash flow of $79 million in 2023, reflecting tight management of CapEx and working capital [26] - The company ended 2023 with $259 million in cash and $471 million in liquidity, indicating a strong liquidity position heading into 2024 [13] Business Line Data and Key Metrics Changes - Sales of recycled content-containing products increased by 16% year-over-year, indicating growth in sustainable offerings [24] - Adjusted EBITDA for Q4 was below expectations due to pronounced seasonality and destocking, with a forecasted rebound to $40 million to $50 million in Q1 [12][14] - The company reduced fixed costs by over $70 million since 2022, improving profitability and cash flow [6] Market Data and Key Metrics Changes - The company observed a recovery in volumes early in Q1, particularly in specialty business applications such as automotive and building and construction [33] - The company noted that customer destocking and competitive pressure from imports into Europe affected market demand throughout 2023 [9] - The company expects underlying market demand to remain constrained and generally in line with 2023 levels, despite higher volumes in specialty businesses [76] Company Strategy and Development Direction - The company remains focused on advancing sustainability initiatives and achieving 2030 sustainability goals, including the operation of recycling facilities in the Netherlands and Italy [10] - The company is exploring additional network optimization opportunities in Europe to enhance competitiveness [28] - The strategy emphasizes liquidity and profitability improvement while managing working capital effectively [27] Management's Comments on Operating Environment and Future Outlook - Management described 2023 as one of the most challenging years in the company's history, with significant customer destocking and geopolitical conflicts impacting trade flows [9] - The company anticipates significantly higher profitability in 2024 due to restructuring actions and expected lower natural gas hedge losses [28] - Management expressed caution regarding the full-year outlook for 2024 due to uncertainties in market recovery, particularly in China [42] Other Important Information - The company achieved a Triple Zero Award for 72% of its eligible sites, reflecting strong performance in environmental, health, and safety standards [75] - The company plans to maintain a disciplined cash focus with lower-than-historical CapEx of about $70 million in 2024 [68] Q&A Session Summary Question: Can you provide more details on the end markets seeing volume increases? - Management indicated that volume improvements are primarily in specialty business applications in Europe, automotive, and building and construction [33] Question: How will cash flow components impact 2024? - Management expects to achieve a working capital release of $50 million and does not anticipate needing to draw on credit lines due to sufficient cash reserves [34] Question: What is the minimum cash level the company feels comfortable maintaining? - Management stated that a minimum cash level of about $100 million is necessary to manage intra-month working capital swings [35] Question: What are the drivers for expected improvements in Q1? - The expected improvements are driven by volume recovery, the full benefit of restructuring activities, and the completion of a turnaround in the company's largest resin plant [86]

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 ...