Graphic Packaging Holding Company Investigated by the Portnoy Law Firm

LOS ANGELES, March 16, 2026 (GLOBE NEWSWIRE) -- The Portnoy Law Firm advises Graphic Packaging Holdings Company, (“Graphic Packaging" or the "Company") (NYSE:GPK) investors that the firm has initiated an investigation into possible securities fraud, and may file a class action on behalf of investors. Investors are encouraged to contact attorney Lesley F. Portnoy, by phone 844-767-8529 or email: lesley@portnoylaw.com, to discuss their legal rights, or join the case via https://portnoylaw.com/graphic-packagin ...