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Trinseo Announces Secondary Offering of 8,000,000 Ordinary Shares by Selling Shareholder

Berwyn, PA - Monday, May 9, 2016

Trinseo (NYSE: TSE), a global materials solutions provider and manufacturer of plastics, latex binders and synthetic rubber, today announced that Bain Capital Everest Manager Holding SCA (the “Selling Shareholder”) has agreed to sell 8,000,000 ordinary shares pursuant to the Company’s shelf registration statement filed with the Securities and Exchange Commission (the “SEC”). The Selling Shareholder will receive all of the net proceeds from this offering.  No shares are being sold by the Company.  Goldman, Sachs & Co. will act as the sole book-running manager for the offering (the “Underwriter”).

A shelf registration statement (including a prospectus) relating to the offering of ordinary shares was filed with the SEC on March 15, 2016 and became effective on March 18, 2016.  Before you invest, you should read the prospectus included in that registration statement and the documents incorporated by reference in that registration statement as well as the prospectus supplement related to this offering.  You may obtain these documents for free by visiting EDGAR on the SEC website at www.sec.gov.  When available, copies of the prospectus supplement and accompanying prospectus related to the offering may also be obtained by contacting Goldman, Sachs & Co., Attn: Prospectus Department, 200 West Street, New York, NY 10282, telephone: 212- 902-1171, facsimile: 212-902-9316, e-mail: prospectus-ny@ny.email.gs.com.

The offering of these securities will be made only by means of a prospectus supplement and the accompanying prospectus.

This release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or other jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or other jurisdiction.  Any offer to buy the securities may be withdrawn or revoked, without obligation or commitment of any kind, at any time prior to notice of its acceptance given after the effective date of the shelf registration statement.

About Trinseo

Trinseo (NYSE:TSE) is a global materials solutions provider and manufacturer of plastics, latex binders, and synthetic rubber with a focus on delivering innovative, sustainable, and value-creating products that are intrinsic to our daily lives. Trinseo is dedicated to making a positive impact on society by partnering with like-minded stakeholders, and supporting the sustainability goals of our customers in a wide range of end-markets including automotive, consumer electronics, appliances, medical devices, packaging, footwear, carpet, paper and board, building and construction, and tires. Trinseo had approximately $3.8 billion in net sales with 2,700 employees globally in 2019. For more information, please visit: www.trinseo.com.

Note on Forward-Looking Statements

This press release may contain “forward-looking statements” including, without limitation, statements concerning plans, objectives, goals, projections, expectations, strategies, future events or performance, and underlying assumptions and other statements, which are not statements of historical facts. Forward-looking statements may be identified by the use of words like “expect,” “estimate,” “will,” “may,” or expressions of similar meaning. Forward-looking statements reflect management’s evaluation of information currently available and are based on the Company’s current expectations and assumptions regarding the impact from the COVID-19 pandemic, the Company’s business, the economy and other future conditions. Specific factors that could cause future results to differ from those expressed by the forward-looking statements include, but are not limited to, risks related to the ongoing impact of the COVID-19 pandemic and those discussed in the Company’s Annual Report for the year ended December 31, 2019 filed with the Securities and Exchange Commission (“SEC”), in subsequent Quarterly Reports on Form 10-Q and in other filings and furnishings made by the Company with the SEC from time to time. Other unknown or unpredictable factors could also have material adverse effects on the Company’s performance. As a result of these or other factors, the Company’s actual results may differ materially from those contemplated by the forward-looking statements. The forward-looking statements included in this press release are made only as of the date hereof and are not a guarantee of future performance. The Company undertakes 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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