<div id="readability-page-1"><div>GPK Investors Have Opportunity to Join Graphic Packaging Holding Company Fraud Investigation with the Schall Law Firm The Schall Law Firm, a national shareholder rights litigation firm, announces that it is investigating claims on behalf of investors of Graphic Packaging Holding Company (“Graphic Packaging” or “the Company”) (NYSE: GPK) for violations of the securities laws. The investigation focuses on whether the Company issued false and/or misleading statements and/or failed to disclose information pertinent to investors. Graphic Packaging lowered its full-year core earnings and profit outlook on December 8, 2025. Based on this news, shares of Graphic Packaging fell by more than 8.6% on the next day. If you are a shareholder who suffered a loss, click here to participate. We also encourage you to contact Brian Schall of the Schall Law Firm, 2049 Century Park East, Suite 2460, Los Angeles, CA 90067, at 310-301-3335, to discuss your rights free of charge. You can also reach us through the firm's website at www.schallfirm.com, or by email at bschall@schallfirm.com. The Schall Law Firm represents investors around the world and specializes in securities class action lawsuits and shareholder rights litigation. This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and rules of ethics. <img src="https://imageproxy.pbkrs.com/https://cts.businesswire.com/ct/CT/query-ZGlzdHJvPW54JmlkPWJ3bmV3cyZsYW5nPWVuJnNpZD1tc3RyMyZzdHk9MjAyNTEyMjk1MDMxMDVyMQ?x-oss-process=image/auto-orient,1/interlace,1/resize,w_1440,h_1440/quality,q_95/format,jpg" original-src="https://imageproxy.pbkrs.com/https://cts.businesswire.com/ct/CT/query-ZGlzdHJvPW54JmlkPWJ3bmV3cyZsYW5nPWVuJnNpZD1tc3RyMyZzdHk9MjAyNTEyMjk1MDMxMDVyMQ"/> The Schall Law Firm Brian Schall, Esq. 310-301-3335 info@schallfirm.com www.schallfirm.com View source version on businesswire.com: https://www.businesswire.com/news/home/20251229503105/en/</div></div>

Schall 律師事務所正在代表 Graphic Packaging Holding Company（紐約證券交易所代碼：GPK）的投資者調查潛在的證券法違規行為。調查的重點是該公司是否發佈了虛假或誤導性聲明，特別是在 2025 年 12 月 8 日下調全年盈利預期後，導致股價下跌 8.6%。遭受損失的股東被鼓勵參與調查，並可以聯繫該事務所以獲取更多信息

GPK 投資者有機會與 Schall 律師事務所合作，參與對 Graphic Packaging Holding Company 的欺詐調查