NEW YORK, Dec. 30, 2025 (GLOBE NEWSWIRE) -- Pomerantz LLP is investigating claims on behalf of investors of Graphic Packaging Holding Company (“Graphic Packaging” or the “Company”) (NYSE: GPK).  Such investors are advised to contact Danielle Peyton at newaction@pomlaw.com or 646-581-9980, ext. 7980. The investigation concerns whether Graphic Packaging and certain of its officers and/or directors have engaged in securities fraud or other unlawful business practices.  [Click here for information about joining ...