0001408075 2026-05-19 2026-05-19 GRAPHIC PACKAGING HOLDING CO false 0001408075 8-K 2026-05-19 DE 001-33988 26-0405422 1500 Riveredge Parkway Atlanta GA 30328 (770) 240-7200 false false false false Common Stock, $0.01 par value per share GPK NYSE false