NYSE: TSE

Trinseo PLC

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.

If you purchased Trinseo securities and would like to join the prospective action, please click “Join This Class Action.”

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Details of investigation:

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.

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Company Name: Trinseo PLC
Stock Symbol: TSE
Class Period: N/A
Court: N/A
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The Rosen Law Firm has been ranked among the top 4 law firms each year since 2013 for the number of successful securities class actions on behalf of investors. In 2019 alone, our firm recovered $438 million for investors.

Investors should carefully identify and select experienced counsel with a track record of success leading securities class actions. Often other firms issue press releases about class actions yet do not have comparable experience or resources.

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The Rosen Law Firm represents investors throughout the globe. Our mission is to prosecute securities fraud class actions and protect shareholders’ rights.

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