Trinseo Announces Quarterly Dividend of $0.01 Per Share

Record Date Correction

June 27, 2024

WAYNE, Pa.-- Trinseo (NYSE: TSE), a specialty material solutions provider, today announced a correction to its previously issued press release dated June 27, 2024, under the headline "Trinseo Announces Quarterly Dividend of $0.01 Per Share". The previous press release contained a typographical error which erroneously indicated that the record date for the dividend was payable to shareholders of record as of the close of business on "July 7, 2024" rather than the correct record date of July 8, 2024. Other than this correction, there are no other changes to the previous press release.

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 approximately 3,100 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 $3.7 billion in 2023. Discover more by visiting www.trinseo.com and connecting with Trinseo on LinkedIn, Twitter, Facebook, and WeChat.

Cautionary Note on Forward-Looking Statements

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," "outlook," "will," "may," "might," "see," "tend," "assume," "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, our ability to successfully implement proposed restructuring initiatives and 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; 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; conditions in the global economy and capital markets; our current and future levels of indebtedness and ability to service our debt; our ability to meet the covenants under our existing indebtedness; our ability to generate cash flows from operations; 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.

Contact:

Andy Myers

Tel : +1 610-240-3221

Email: [email protected]