Costco Wholesale (COST) has delivered a 481 percent return over the past decade, powered by relentless membership growth. The company's paid membership base has risen every year, including during the brief U.S. recession from February through April 2020, reaching 82.9 million by the end of fiscal third quarter 2026.
The membership model's durability rests on renewal rates consistently near or above 90 percent. Costco operates on a razor-thin 3 percent net profit margin—a structural advantage few competitors can replicate without severe financial strain. Through the first three quarters of fiscal 2026, the company reported net sales of $203 billion and merchandise costs of $181 billion, leaving minimal room for cost-cutting rivals.
The company reinvests profits to secure better supplier deals, creating a virtuous cycle of high-volume sales and member value that compounds its competitive moat. Few retailers can match Costco's sales velocity and unit economics.
Yet the valuation has detached from fundamentals. Costco trades at 47 times trailing earnings versus 30 times a decade ago. Wall Street estimates 11 percent annual earnings growth—respectable, but far below what the current multiple implies over the next five years. The market has priced in the company's consistency and growth.
For new money, the risk-reward is unfavorable. A reversion to Costco's 10-year average multiple of 30x would imply significant downside, even if earnings continue to compound. Waiting for a more attractive entry point—particularly around a market correction or temporary multiple compression—is the prudent approach.
