NEW YORK--(BUSINESS WIRE)--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. ...