Packaging Corporation of America

Packaging Corporation of America is the third-largest producer of containerboard products and a leading manufacturer of uncoated freesheet paper in North America, operating ten mills and 91 corrugated products plants that generated $8.99 billion in revenue in fiscal 2025. The company sits at the intersection of every physical supply chain in the American economy: its corrugated boxes ship food, beverages, durable goods, e-commerce orders, and industrial components to roughly 12,000 customers across 27,000 locations.

This is a story about an operator that has consistently earned returns above its cost of capital through the cycle by running mills better than competitors and refusing to overpay for growth. The September 2025 acquisition of Greif's containerboard business for $1.8 billion in cash added two mills and eight converting plants, extending the same playbook to new assets. The file turns on a single question: whether the current cyclical upswing in containerboard markets has enough runway to let the Greif integration mature before the next downturn tests the balance sheet.

PCA does not make headlines. It makes boxes — roughly 71 billion square feet of them in 2025 — and it has compounded book value per share at a double-digit rate for two decades by reinvesting in its mills, returning capital through dividends and buybacks, and acquiring only when the price and the operational fix are clear. The debate worth having is not whether this is a good business, which the historical record settles, but what the market is currently paying for that quality and how much of the Greif upside is already priced in.