Costco's International Expansion Emerges as Hidden Growth Engine

Costco Wholesale Corporation ($COST) is quietly building a powerful international growth engine that could reshape the company's long-term earnings trajectory. While domestic operations have long anchored the warehouse retailer's success, the company's aggressive international expansion is now outpacing U.S. growth rates, with comparable sales surging 13% year-over-year in the most recent quarter—nearly double the company's total comparable sales growth. This divergence signals that Costco's overseas markets are becoming an increasingly critical profit driver, even as the mature U.S. market faces saturation pressures.

International Markets Accelerating Faster Than Domestic Operations

The contrast between Costco's international and domestic growth rates is striking and revealing. During the second quarter of fiscal 2025, the company reported total comparable sales growth of 7.4%, but this masks the dramatically outperforming international segment. International comparable sales growth of 13% demonstrates that overseas warehouses are delivering significantly stronger pricing power, traffic, and merchandise sales than their American counterparts.

The company's physical footprint in key markets reflects a deliberate, measured approach to international expansion:

• Canada: 115 stores
• Japan: 37 stores
• United Kingdom: 29 stores
• China: 7 recently opened stores (newest market entry)

Looking ahead, Costco is planning to open 28 net new stores in 2026 and targets at least 30 annually—a significant acceleration in growth rate that underscores management's confidence in both established and emerging markets. The China entry, in particular, represents a calculated bet on one of the world's largest consumption markets, though the company is taking a deliberately cautious approach with only seven locations currently operational.

Market Context: Why This Moment Matters for Warehouse Retail

The warehouse club sector has historically been dominated by U.S. operations, with international expansion viewed as a secondary priority. Costco, Sam's Club (owned by Walmart), and other players in the space have operated primarily within North American borders, where demographic trends, consumer behavior, and logistics networks are well-established.

However, global economic conditions and shifting consumer preferences are creating new opportunities. The post-pandemic surge in warehouse club memberships has plateaued in the United States, as the company faces saturation in major metropolitan areas and competition from e-commerce and rapid-delivery services. Meanwhile, middle-class growth in developed markets like Japan and the United Kingdom, combined with improving logistics infrastructure in China, is opening doors for warehouse retail concepts previously considered too niche for international markets.

Costco's international outperformance is particularly notable because it suggests the company's core value proposition—bulk purchasing, low prices, high-quality private label merchandise, and membership exclusivity—translates effectively across cultural and economic boundaries. The 13% comparable sales growth in international markets indicates that the company isn't just opening stores; it's capturing sustained consumer interest and building sticky customer relationships with membership models.

Regulatory environments also matter here. The company has navigated Japan's retail regulations and complex supply chain dynamics for decades, while its recent U.K. expansion taps into a developed economy with established distribution networks. China represents the highest-risk, highest-reward bet, but the company's cautious entry strategy suggests realistic expectations and a long-term mindset.

Investor Implications: Recalibrating Growth Expectations

For shareholders, Costco's international trajectory has several important implications:

Revenue and Margin Dynamics: International markets often carry higher initial costs due to real estate, staffing, and logistics setup. However, once warehouses achieve full operational maturity, margins typically expand significantly. Costco's ability to generate 13% comparable sales growth internationally suggests these markets are moving rapidly through the profitability curve. As international stores mature, this segment should contribute disproportionately to earnings growth.

Multiple Re-rating Potential: If investors have underestimated Costco's international growth potential, the stock could merit a higher growth multiple. A warehouse retailer with sustained 13% comps in a material portion of its business warrants comparison to higher-growth retailers, not purely mature, low-growth operators.

Earnings Visibility: The company's target of opening at least 30 net new stores annually provides predictable revenue tailwinds for at least the next 3-5 years. Each new warehouse generates substantial incremental revenue and, after a ramp-up period, meaningful incremental profit. This visibility is valuable in an uncertain macro environment.

Long-Tail Optionality: The China entry, though small with only seven stores, represents optionality. If Costco can successfully penetrate the Chinese consumer market—a notoriously difficult task for foreign retailers—the upside to the stock's long-term value could be substantial. Conversely, limited downside risk exists at this stage given the small store count.

Investors should also consider that this international growth narrative has been somewhat underappreciated relative to Costco's overall market story. Wall Street frequently focuses on U.S. membership growth and comparable sales, potentially missing the forest for the trees. The shift in momentum toward international markets could prompt analyst earnings model revisions upward in coming quarters.

Looking Ahead: The Next Chapter of Costco's Growth Story

Costco's international expansion represents a genuine inflection point for a company that has long been viewed as a mature, steady-growth business. The warehouse retailer is demonstrating that the business model—bulk purchasing, value proposition, membership ecosystem—has global applicability, not just North American relevance.

With 28 net new stores planned for 2026 and sustained 13% international comparable sales growth, Costco is positioning itself to achieve higher structural growth rates than previously modeled. The combination of a maturing international footprint producing strong comps, new store openings providing revenue tail winds, and careful expansion into high-potential markets like China suggests the company could deliver solid earnings growth acceleration over the next 3-5 years.

For long-term investors in $COST, the international story is no longer a sideshow—it's becoming the primary growth narrative.