Oct 12, 2025 9:54 PM Eastern Daylight Time LOS ANGELES--(BUSINESS WIRE)--The Schall Law Firm, a national shareholder rights litigation firm, announces that it is investigating claims on behalf of investors of Trinseo PLC ("Trinseo†or "the Company†) (NYSE: TSE) for violations of the securities laws. The investigation focuses on whether the Company issued false and/or misleading statements and/or failed to disclose information pertinent to investors. Trinseo announced on October 6, 2025, that it would suspe ...