Costco vs Walmart: Which Retail Giant Deserves the Premium?

Costco's business model is elegant in its simplicity. Sell products at roughly breakeven, and make all the profit on membership fees. Revenue of $275.2 billion in fiscal 2025 grew at a solid 8% annual clip, with net income of $8.1 billion reflecting a 2.9% profit margin. The membership renewal rate of 93% in the US creates extraordinary revenue visibility.

With $450 billion in market capitalisation and a trailing PE of 53x, Costco is the most expensive large-cap retailer in the world. The justification is predictability — membership fees of roughly $4.6 billion annually are essentially contractual recurring revenue with near-zero churn. In a market starved for quality compounders, Costco's consistency commands a scarcity premium.

But predictability has a price, and at 53x, you're paying 50x the annual membership fee stream — a multiple that implies decades of compounding with no disruption.

Walmart dwarfs Costco at $674.5 billion in revenue, but the valuation gap tells you the market thinks scale is the only advantage. We think that's wrong. Walmart's net income of $20.5 billion is 2.5x Costco's, and it's growing faster — the jump from $11.3 billion in FY2023 to $20.5 billion in FY2025 reflects an 82% increase that Costco can't match.

Walmart's transformation into a technology-enabled retail platform — with advertising revenue, membership services, automated fulfilment, and healthcare — creates multiple growth vectors that Costco's simpler model doesn't possess. Walmart Connect alone generates more advertising revenue than Costco's entire net income.

At 38x trailing earnings, Walmart is expensive by historical standards — the stock traditionally traded at 15-20x. But the margin expansion story justifies a re-rating from legacy retail multiples toward platform multiples.

Revenue growth: Walmart grew revenue at 7.8% CAGR over four years; Costco at 8.9%. Slight edge to Costco, but the gap is narrowing as Walmart's e-commerce and advertising businesses accelerate.

Margin trajectory: Costco's operating margin sits at 3.7%, virtually unchanged in a decade. Walmart's has expanded from 4.0% to 4.8% over two years, with advertising and membership pushing it higher. Clear edge to Walmart on margin momentum.

Capital allocation: Costco returned $7.1 billion to shareholders via the special dividend in December 2024. Walmart returned $12.7 billion through buybacks and its 52-year dividend streak. On a percentage-of-FCF basis, both are returning roughly 90%+ to shareholders. It's a tie, though Walmart's consistency (52 consecutive annual raises) gets a marginal edge.

Valuation: Costco at 53x earnings, 1.6x sales. Walmart at 38x earnings, 0.9x sales. On every metric, Walmart is cheaper — and yet its growth rate, margin trajectory, and diversification story are arguably stronger.