Law Offices of Howard G. Smith Announces Investigation of Graphic Packaging Holding Company (GPK) on Behalf of Investors

Core Viewpoint - The Law Offices of Howard G. Smith is investigating potential claims against the board of directors of Graphic Packaging Holding Company regarding possible breaches of fiduciary duties to shareholders [1]. Group 1: Investigation Details - A shareholder owning 4.2% of Graphic Packaging's stock issued a letter in December 2025, following the announcement of Robbert E. Rietbroek as the new CEO, replacing Michael Doss [3]. - The investigation focuses on whether the board of directors grossly mismanaged the company and breached its fiduciary duties in connection with the CEO transition and the subsequent departure of the Executive Vice President and General Counsel [3]. Group 2: Participation Information - Shareholders who held Graphic Packaging shares purchased before December 2025 are encouraged to contact the Law Offices of Howard G. Smith to discuss their legal rights and potential participation in the investigation [2][4].