Costco or Amazon: Which Stock Deserves Your Investment Portfolio in 2026?

As we navigate 2026, two retail and technology giants are sending investors starkly different signals. Amazon and Costco Wholesale have both built impressive legacies of shareholder returns, yet their current valuation metrics and growth trajectories paint a fascinating contrast. What makes this comparison particularly compelling is that the cheaper-looking stock is actually growing significantly faster — a dynamic that raises important questions about which presents better value at current prices.

Diverging Momentum: Understanding Recent Market Moves

The two companies have recently traveled in opposite directions. Amazon shares have retreated approximately 14% over the past month as the market processes the company’s aggressive $200 billion capital spending announcement for 2026. Costco, by contrast, has advanced 17% since the year began, as investors gravitate toward the perceived stability and predictability of its business model during periods of economic uncertainty.

This divergence reflects deeper differences in how the market perceives these two enterprises. Costco trades at roughly 54 times earnings — pricing in expectations for near-flawless execution indefinitely. Amazon commands a notably lower multiple of approximately 29 times earnings. For investors seeking to understand which opportunity makes more sense, this valuation gap deserves closer examination alongside each company’s actual business performance.

Costco’s Membership Model: Scale Meets Valuation Risk

Costco’s financial metrics demonstrate the durability of its business foundation. In its fiscal first quarter ending November 23, net sales climbed 8.2% year-over-year to approximately $66 billion. More importantly, comparable warehouse sales increased 5.9% in the U.S. (excluding gasoline and currency effects) and 6.4% across North America and international operations.

The true engine of Costco’s profitability remains its membership fee structure. These fees — flowing almost entirely to the bottom line — surged 14% year-over-year to $1.33 billion. Even after implementing a membership increase in late 2024, the company maintained an impressive 92.2% renewal rate among U.S. and Canadian members.

However, this exceptional valuation at 54 times earnings leaves minimal margin for disappointment. Should consumer spending weaken or membership growth plateau, the current stock price lacks a cushion to absorb such headwinds. This represents the primary risk for investors considering Costco at present valuations.

Amazon’s Cloud Acceleration and the AI Infrastructure Bet

Amazon’s fourth-quarter earnings announcement on February 5 revealed a business firing on multiple cylinders. Total net sales expanded 14% year-over-year to $213.4 billion, while operating income surged from $21.2 billion in the prior-year period to $25 billion — demonstrating both revenue growth and profit expansion simultaneously.

The standout performer was Amazon Web Services (AWS), which accelerated to 24% revenue growth, reaching $35.6 billion. This marks a notable inflection point. The company faced optimization headwinds over the previous two years as enterprise customers scrutinized cloud spending more carefully. That pressure has now visibly eased, signaling renewed confidence in AWS value proposition.

What’s driving this AWS resurgence? The artificial intelligence boom. According to CEO Andy Jassy, “Customers really want AWS for core and AI workloads. And we are monetizing capacity as fast as we can install it.” This demand surge justifies Amazon’s massive infrastructure commitment.

Capital Spending and the Margin Question

The significant unknown hovering over Amazon involves whether its record capital expenditure plan delivers proportional returns. The company is doubling down on infrastructure — committing $200 billion to capital spending in 2026, up sharply from the $131.8 billion invested in 2025. This surge will undoubtedly pressure free cash flow in the near term.

The gamble is clear: these investments must generate sufficient returns through AWS capacity monetization, strengthened competitive positioning, and new revenue opportunities to justify the spending. Amazon’s operating margin will face near-term pressure, but the long-term payoff could be substantial if management’s AWS thesis proves correct.

The Valuation Calculation

Here’s where the comparison crystallizes. Amazon trades at approximately 29 times earnings while simultaneously growing its high-margin advertising revenue by 22% and cloud revenue by 24%. For context, Costco grows roughly 8% overall while commanding a 54 times earnings multiple.

This valuation gap reflects a fundamental market question: Is Amazon’s growth rate premium sufficient to justify its lower multiple, or is Costco’s durability worth the premium price? The mathematics suggest that at 29 times earnings, Amazon’s valuation already incorporates substantial risk that the massive AI infrastructure spending fails to deliver anticipated returns. If those investments perform as management hopes, today’s entry point could appear remarkably inexpensive in retrospect.

The Investment Decision

Both companies possess formidable structural advantages that are unlikely to erode. Amazon dominates cloud computing and maintains an unparalleled logistics network. Costco commands incomparable scale and enjoys exceptional customer loyalty that manifests through its membership renewal rates.

Yet valuation ultimately determines which represents the superior buying opportunity at current prices. Costco’s 54 times earnings multiple — while justified by business quality — leaves little room for error if consumer dynamics shift. For this reason, waiting for a more attractive entry point on Costco appears prudent.

Amazon, conversely, offers a compelling risk-reward profile at 29 times earnings. The stock has already experienced meaningful pressure, pricing in substantial skepticism about the AI infrastructure spending. Should those investments produce the anticipated returns, investors purchasing at these levels will have captured significant gains. Meanwhile, even if returns prove somewhat disappointing, the current valuation suggests downside protection exists.

For growth-oriented investors tolerant of near-term operating leverage pressure, Amazon stock represents a genuine buying opportunity on this recent weakness.

Disclosure: Individual investors should conduct their own research before making investment decisions. Past performance, including the historical returns mentioned for Netflix and Nvidia in previous analyses, does not guarantee future results. This analysis is intended for informational purposes and should not be considered personalized investment advice.