Rosen Law Firm Encourages Trinseo PLC Investors to Inquire About Securities Class Action Investigation – TSE

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2:30 PM on Wednesday, October 22

The Associated Press

NEW YORK--(BUSINESS WIRE)--Oct 22, 2025--

Why: Rosen Law Firm, a global investor rights law firm, announces an investigation of potential securities claims on behalf of shareholders of Trinseo PLC (NYSE: TSE) resulting from allegations that Trinseo may have issued materially misleading business information to the investing public.

So What: If you purchased Trinseo securities you may be entitled to compensation without payment of any out of pocket fees or costs through a contingency fee arrangement. The Rosen Law Firm is preparing a class action seeking recovery of investor losses.

What to do next: To join the prospective class action, go to https://rosenlegal.com/submit-form/?case_id=13711 or call Phillip Kim, Esq. toll-free at 866-767-3653 or email [email protected] for information on the class action.

What is this about: On October 6, 2025, before the market opened, the Company issued a press release entitled “Trinseo Announces Strategic Operational Plans in Europe and Dividend Suspension.” The press release stated that Trinseo will “permanently close its methyl methacrylate (“MMA”) production operations at its Rho, Italy facility and its acetone cyanohydrin (“ACH”) production operations in Porto Marghera, Italy.” It also stated that Trinseo’s Board had voted to “indefinitely” suspend Trinseo’s dividend.

On this news, Trinseo stock fell 10.9% on October 6, 2025.

Why Rosen Law: We encourage investors to select qualified counsel with a track record of success in leadership roles. Often, firms issuing notices do not have comparable experience, resources, or any meaningful peer recognition. Many of these firms do not actually litigate securities class actions. Be wise in selecting counsel. The Rosen Law Firm represents investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation. Rosen Law Firm achieved the largest ever securities class action settlement against a Chinese Company at the time. At the time Rosen Law Firm was Ranked No. 1 by ISS Securities Class Action Services for number of securities class action settlements in 2017. The firm has been ranked in the top 4 each year since 2013 and has recovered hundreds of millions of dollars for investors. In 2019 alone the firm secured over $438 million for investors. In 2020, founding partner Laurence Rosen was named by law360 as a Titan of Plaintiffs’ Bar. Many of the firm’s attorneys have been recognized by Lawdragon and Super Lawyers.

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Attorney Advertising. Prior results do not guarantee a similar outcome.

View source version on businesswire.com:https://www.businesswire.com/news/home/20251022024954/en/

CONTACT: Laurence Rosen, Esq.

Phillip Kim, Esq.

The Rosen Law Firm, P.A.

275 Madison Avenue, 40th Floor

New York, NY 10016

Tel: (212) 686-1060

Toll Free: (866) 767-3653

Fax: (212) 202-3827

[email protected]