Costco Beats Sales Expectations but Margin Pressure Clouds Outlook

Costco Wholesale Corp. (COST) delivered a robust third‑quarter performance that reaffirmed its core franchise: low‑price membership value paired with disciplined expansion. Net sales surged 11.6% year‑over‑year to $69.15 billion, outpacing the Street’s median estimate of $66.8 billion, while comparable sales rose 9.8% across the board. The company also posted a 15.2% increase in net income to $2.192 billion and EPS of $4.93, both comfortably above analyst expectations.

Despite the headline strength, the market reacted with a muted slide – Costco shares slipped 0.85% on the day, hovering near the low‑end of their 52‑week range. The primary driver was a gross margin contraction to 11.04%, down 21 basis points from the prior quarter, and the fact that management offered no forward guidance for FY2027. In an environment where investors prize clarity on future sales velocity and cost structure, the silence amplified concerns about margin headwinds.

Sales Growth – The Numbers Behind the Beat

• Net sales: $69.15 billion (↑11.6% YoY) vs. consensus $66.8 bn.
• Year‑to‑date net sales: $203.37 billion, up 9.6%.
• Comparable sales: 9.8% overall; U.S. 9.4%, Canada 10.7%, Other International 11.2%.
• Adjusted comparable sales (ex‑gas & FX): 6.6% growth – a more conservative gauge that still beats the 5.3% consensus.

The company’s digitally‑enabled comparable sales exploded 21.5% YoY, underscoring the continued relevance of e‑commerce in Costco’s traditionally brick‑and‑mortar model. The surge was broad‑based, with notable lifts in the U.S., Canada, Japan, and the United Kingdom where app push notifications and a refreshed online storefront have driven higher basket sizes.

Segment Divergence – Where Growth Accelerates

United States: 639 warehouses generated 9.4% comparable sales growth, slightly ahead of the adjusted 6.8% figure. The U.S. market remains the cash‑cow, delivering roughly 70% of total revenue. However, gasoline price volatility shaved margin on fuel sales, a factor that partially explains the overall margin dip.

Canada: With 115 locations, Canada posted the strongest comparable sales increase at 10.7%, though adjusted growth was 6.2%. The Canadian market benefits from higher average ticket sizes and a growing executive‑membership base, which now accounts for 75% of total sales – a metric that signals premium‑tier penetration.

Other International: A composite of Mexico, Japan, the U.K., Korea, Australia, Taiwan, China, Spain, France, Sweden, Iceland, and New Zealand delivered 11.2% comparable growth (adjusted 5.9%). Japan’s 37 warehouses were a bright spot, with e‑commerce adoption accelerating after a localized website rollout in Q2.

Margin Dynamics – The Cost of Scale

Costco’s gross margin slipped to 11.04%, a 21‑basis‑point decline from the prior quarter and the first sub‑11.1% reading since FY2023. Management attributed the erosion primarily to gasoline price impacts, which reduced fuel margins by roughly 5 basis points. Excluding gasoline, margin was flat year‑over‑year, suggesting that product mix and supplier negotiations remain disciplined.

Operating income rose to $2.815 billion (up from $2.68 bn), reflecting higher sales volume offsetting the margin compression. The operating margin therefore improved modestly to 4.07%, reinforcing Costco’s ability to generate cash even when gross profitability wavers.

Capital Allocation – Cash‑Heavy Balance Sheet Fuels Flexibility

Cash and cash equivalents ballooned to $18.946 billion, bolstered by $11.133 billion of operating cash flow. The company deployed $4.228 billion in property and equipment additions, primarily for new warehouse construction and refurbishment of existing sites. Share repurchases totaled $603 million, while the quarterly dividend was $1.154 billion, maintaining the 2% payout ratio that investors have come to expect.

The robust cash position gives Costco leeway to continue its aggressive expansion – now at 931 warehouses worldwide – without compromising financial stability. The incremental capital spend is modest relative to free cash flow, preserving a healthy dividend and buyback capacity for the remainder of FY2026.

Membership Metrics – The Engine of Recurring Revenue

Total cardholders climbed 4.0% to 148.5 million, with renewal rates holding steady at 89.7% globally. Executive membership penetration reached 75% of sales, a testament to the higher‑margin, higher‑spending cohort that cushions earnings when commodity items face pricing pressure.

The combination of strong renewal rates and modest cardholder growth underscores Costco’s sticky revenue model. Analysts note that even a 0.5% dip in renewal could shave $300 million off annual sales, so maintaining the sub‑90% threshold is critical.

The Guidance Void – Why It Matters

Costco deliberately omitted forward guidance for FY2027, a departure from its usual practice of providing at least a topline sales outlook. In earnings calls, management emphasized “focus on delivering value to members” and cited “uncertainty in global fuel pricing and macro‑economic conditions.” The lack of guidance left analysts scrambling for proxy metrics; consensus estimates now rely heavily on comparable sales trends and warehouse count expansions.

The market’s reaction – a modest share decline despite earnings beat – reflects this uncertainty. While the analyst base remains largely bullish, with an average price target of $1,050 (a 5% upside), the absence of a formal outlook injects a risk premium that could weigh on near‑term valuation.

Competitive Landscape and Outlook

Costco’s performance must be viewed against peers such as Walmart (WMT) and Amazon (AMZN). Walmart reported FY2026 comparable sales growth of 5.9%, while Amazon’s net sales rose 10% YoY, but both face margin pressure from logistics costs. Costco’s digital sales acceleration positions it uniquely to capture e‑commerce share without sacrificing its low‑price ethos.

Looking forward, the key catalysts are: 1. Warehouse pipeline: 20 new sites slated for FY2027, primarily in underserved U.S. markets and secondary international locations. 2. Digital rollout: Expansion of localized e‑commerce platforms to three additional countries (Germany, Italy, Brazil) by Q4 FY2026. 3. Fuel price volatility: Continued exposure could swing gross margin quarterly; hedging strategies remain limited.

If comparable sales sustain double‑digit growth and the company can stabilize margins above 11%, Costco is well‑positioned to deliver another year of earnings accretion while returning cash to shareholders.

--- Bottom line: Costco’s Q3 results showcase resilient top‑line growth and a powerful membership engine, but margin compression and the decision to withhold guidance inject caution into an otherwise bullish narrative. Investors will be watching warehouse expansion cadence and digital adoption rates closely as leading indicators of whether the retailer can translate sales momentum into sustainable profitability.