GPK Shareholder Alert: Graphic Packaging Holding Company Securities Class Action Lawsuit - Investors With Losses May Contact The Gross Law Firm

NEW YORK, June 2, 2026 /PRNewswire/ -- The Gross Law Firm issues the following notice to shareholders of Graphic Packaging Holding Company (NYSE: GPK). Shareholders who purchased shares of GPK during the class period listed are encouraged to contact the firm regarding possible lead plaintiff appointment.