Market Cap Drops $230 Million in a Day: What Happened to U.S. Paper Packaging Stocks?

Graphic Packaging Holding Company (GPK), a U.S. paper packaging firm, tumbled 5.89% on the New York Stock Exchange on the 21st, closing at $10.08. Its market capitalization now stands at about $2.98 billion (roughly KRW 4.2 trillion), wiping out approximately $166 million (around KRW 230 billion) in value in a single day. Trading volume reached 2,918,401 shares.

Recently, the company has faced allegations concerning its inventory disclosures and guidance, prompting a class-action lawsuit from investors in early May and an investor-damage investigation by the law firm Pomerantz. Meanwhile, in the first quarter of 2026, revenue grew 2% year-over-year, but significant cost provisions led to a net loss, underscoring the volatility in its performance.

Headquartered in Atlanta, Georgia, Graphic Packaging Holding Company is a global producer of paper and corrugated packaging, supplying eco-friendly packaging solutions for beverages, food, and consumer goods. In 2026, the company was named for the first time to Ethisphere’s list of the “World’s Most Ethical Companies,” further strengthening its ESG profile.