Graphic Packaging Holding Company (GPK) Shareholders Who Lost Money Have Opportunity to Lead Securities Fraud Lawsuit

BENSALEM, Pa., June 22, 2026 /PRNewswire/ -- The Law Offices of Howard G. Smith announces that investors with substantial losses have opportunity to lead the securities fraud class action lawsuit against Graphic Packaging Holding Company ("Graphic Packaging" or the "Company") (NYSE: GPK)....