Key FY2024 Sustainability Data:

• 31% reduction of greenhouse gas emissions
• 4% increase for electricity generated from renewable sources
• 5% reduction in total water consumption

Representing changes from 2023 to 2024

Trinseo (NYSE: TSE), a specialty material solutions provider, announced today the release of its FY 2024 Sustainability and Corporate Social Responsibility Report, titled Tides of Change, to capture Trinseo’s 2024 sustainability journey of navigating industry currents while staying the course.

“At Trinseo, our mission remains steadfast: to deliver innovative, sustainable solutions that create value for our customers and support the transition toward a more circular future,” said Frank Bozich, President and Chief Executive Officer of Trinseo. “I’m optimistic that we are well-positioned to chart a course toward a stronger future.”

Detailed in the pages of the newly launched report, Trinseo outlines its continued commitment to driving sustainability across the Company, as guided by its 2030 Sustainability Goals. In 2024, Trinseo achieved five of its 17 goals in the categories of Supplier Responsibility, Responsible Operations and Climate Change. However, the Company still continues to pursue progress in the areas of supplier due diligence, water reduction, Scope 3 emissions management and on-site renewable energy sourcing.

Trinseo also made strategic advancements in its sustainable product portfolio. The Company launched its first chemical recycling demonstration facility dedicated to the depolymerization of acrylic solutions in Rho, Italy, followed by the opening of its acrylonitrile butadiene styrene (ABS) dissolution pilot facility in Terneuzen, the Netherlands. These advanced recycling technologies are instrumental in expanding the range of materials that can be recycled, which help deliver consistent, quality feedstocks to Trinseo’s business segments. These advancements build upon the Company’s portfolio of recycling technologies—mechanical recycling and polystyrene and polycarbonate dissolution—and contribute to building a circular economy.

“Our collective efforts place sustainability at the heart of our innovation, operations, partnerships and business model,” said Han Hendriks, Chief Technology and Sustainability Officer at Trinseo. “Guided by our 2030 Sustainability Goals and Core Values, we are innovating not only our products but also our approach to materials solutions.”

Additional highlights from the Company’s 15th annual Sustainability Report include:

• Enhancing the Supplier Responsibility Goal: Recognizing the evolving landscape of sustainability, Trinseo enhanced its 2030 Supplier Responsibility Goal to broaden its impact by focusing on the environmental footprint and spending influence of both direct and indirect suppliers, reflecting Trinseo’s commitment to creating meaningful change across its value chain.
• Scope 3 Emissions Management: Trinseo finalized the Company's Scope 3 emissions data and received limited assurance from ERM CVS, an independent third-party assurance provider, verifying our inventory. Moving forward, this data will set a baseline for our Scope 3 emissions initiatives in partnership with our suppliers and value chain.
• Research & Development (R&D): Trinseo surpassed its R&D target, with 78% of its technology and innovation/R&D efforts directed toward circular economy solutions. Supported by the Company's dissolution and depolymerization technologies, material solutions like recycled polymethyl methacrylate and polycarbonate resins aim to support industry efforts to transition toward a circular economy.

Trinseo’s FY2024 Sustainability and CSR Report was prepared with reference to the Global Reporting Initiative (GRI) 2021 Universal Standards, and it incorporates the Sustainability Accounting Standards Board (SASB) framework. To provide stakeholders with a holistic understanding of its value creation, Trinseo has also published a Core Impact Report.

For more information about how Trinseo is charting a course for its sustainability strategy, visit Trinseo.com/Sustainability.

About Trinseo

Trinseo (NYSE: TSE), a specialty material solutions provider, partners with companies to bring ideas to life in an imaginative, smart, and sustainably focused manner by combining its premier expertise, forward-looking innovations, and best-in-class materials to unlock value for companies and consumers.

From design to manufacturing, Trinseo taps into decades of experience in diverse material solutions to address customers’ unique challenges in a wide range of industries, including building and construction, consumer goods, medical and mobility.

Trinseo’s employees bring endless creativity to reimagining the possibilities with clients all over the world from the company’s locations in North America, Europe, and Asia Pacific. Trinseo reported net sales of approximately $3.5 billion in 2024. Discover more by visiting www.trinseo.com and connecting with Trinseo on LinkedIn, Twitter, Facebook.

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This press release 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 may be identified by the use of words like “expect,” “anticipate,” “believe,” “intend,” “forecast,” ”estimate,” “see,” “outlook,” “will,” “may,” “might,” “potential,” “likely,” “target,” “plan,” “contemplate,” “seek,” “attempt,” “should,” “could,” “would,” or expressions of similar meaning. Forward-looking statements reflect management’s evaluation of information currently available and are based on our current expectations and assumptions regarding our business, the economy, our current indebtedness, and other future conditions. Because forward-looking statements relate to the future, they are subject to inherent uncertainties, risks and changes in circumstances that are difficult to predict. Factors that might cause future results to differ from those expressed by the forward-looking statements include, but are not limited to, conditions in the global economy and capital markets, including recessionary conditions and the impact of tariffs on global trade relations; our ability to successfully generate cost savings through restructuring and cost reduction initiatives; our ability to successfully execute our business and transformation strategy; increased costs or disruption in the supply of raw materials; deterioration of our credit profile limiting our access to commercial credit; increased energy costs; the timing of, and our ability to complete, a sale of our interest in Americas Styrenics; compliance with laws and regulations impacting our business; any disruptions in production at our chemical manufacturing facilities, including those resulting from accidental spills or discharges; our current and future levels of indebtedness and our ability to service, repay or refinance our indebtedness; our ability to meet the covenants under our existing indebtedness; our ability to generate cash flows from operations and achieve our forecasted cash flows; and those discussed in our Annual Report on Form 10-K, under Part I, Item 1A —"Risk Factors" and elsewhere in our other reports, filings and furnishings made with the U.S. Securities and Exchange Commission from time to time. As a result of these or other factors, our actual results, performance, or achievements may differ materially from those contemplated by the forward-looking statements. Therefore, we caution you against relying on any of these forward-looking statements. The forward-looking statements included in this press release are made only as of the date hereof. We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as otherwise required by law.

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