Costco Wholesale
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Costco Wholesale (COST) investor relations material

Costco Wholesale Monthly Sales Update September 2026 summary

Complete event summary combining all related documents: earnings call transcript, report, and slide presentation.
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Monthly Sales Update September 2026 summary7 Oct, 2026

September sales

  • Five-week retail month ran Aug. 31–Oct. 4, 2026, versus Sept. 1–Oct. 5, 2025.

  • Net sales were $30.02 billion, up 13.0% from $26.58 billion YoY.

  • Reported comparable sales rose 11.4% overall: U.S. 12.5%, Canada 6.3%, Other International 10.8%.

Comparable sales and traffic

  • Comparable sales excluding gasoline price and FX impacts: 7.6% overall; U.S. 8.0%, Canada 4.9%, Other International 7.7%.

  • Comparable traffic was up 4.7% worldwide and 4.3% in the U.S.

  • Labor Day fell one week later in the U.S. and Canada, lifting September total and comparable sales by a little more than 50 bps.

  • Gas price inflation added ~3.8% to reported total comparable sales; worldwide average selling price per gallon rose 32.8% YoY.

  • Digitally enabled sales increased 19.0% reported and 19.1% excluding FX.

Transactions and regional trends

  • Average transaction rose 6.4% worldwide including gas inflation and FX, and 2.8% excluding both.

  • FX impact on sales: Canada ~-1%, Other International ~+1.2%, and total company approximately flat.

  • Strongest U.S. comparable sales were in the Midwest, Southeast, and San Diego; Spain, Taiwan, and China led Other International in local currencies.

  • Cannibalization had an approximately 60 bps negative impact.

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Frequently asked questions

How a membership-only model revolutionized retail

Costco Wholesale Corporation is a multinational retail company that operates a chain of membership-only warehouse clubs. The company is headquartered in Issaquah, Washington, United States. Costco is mostly known for its ability to offer members high-quality products at low prices, selling items in bulk quantities, and the wide range of products available in their stores.

Economies of scale and the virtuous cycle

One of Costco's most significant competitive advantages is its ability to keep prices low while maintaining quality. The company's bulk purchasing strategy, direct relationships with manufacturers, and no-frills store design allow it to offer members high-quality products at lower prices than competitors. Additionally, Costco's membership model generates a steady revenue stream and fosters a loyal customer base.

Costco's economies of scale advantages are a critical factor that sets it apart from its competitors. Economies of scale refer to the cost advantages a business gains by producing or buying in large quantities. By buying goods in bulk quantities, Costco can negotiate better prices from suppliers and pass those savings on to customers. The company also benefits from lower per-unit transportation and storage costs, as larger quantities can be shipped and stored more efficiently.

Further reading: Investing Mastery with Nick Sleep: Nomad's Costco Investment

Because of its large scale, Costco can also invest in its own logistics infrastructure, including warehouses, trucks, and delivery systems, further reducing its costs. The company's distribution system is highly efficient, with warehouses strategically located to serve a large number of customers. Additionally, Costco's business model focuses on offering a limited number of products, reducing the complexity of its supply chain and allowing it to optimize its operations.

Overall, Costco's economies of scale advantages allow it to offer a unique value proposition to its members, combining low prices with high-quality products and a wide selection. The company's focus on simplicity and efficiency in its operations has been a key factor in its success, allowing it to maintain strong supplier relationships and deliver excellent value to customers. The economies of scale and the virtuous cycle have been major factors in making Costco one of the largest retailers in the world.

“If you raise the price on the effing hot dog, I will kill you”

Some outstanding business stories tied to Costco include the story behind Jim Sinegal's quote "If you raise the price on the hotdog, I will kill you", which has become a testament to Costco's commitment to offering members value and quality at an affordable price.

According to the story, during a meeting with Costco's food vendors, Sinegal noticed that the price of the hot dog and soda combo, which was priced at $1.50, had not changed in years. When the vendors suggested raising the price to keep up with inflation and rising costs, Sinegal reportedly responded with his now-famous quote.

Sinegal's response was not just about the hot dog, but about the principle of offering members unbeatable value. Costco's business model has always been based on providing members with high-quality products at low prices, and the hot dog and soda combo is a classic example of this approach. Despite rising costs and inflation, Costco has kept the price of the combo at $1.50 for over three decades, making it one of the most famous bargains in the retail industry.

Three listed peers to Costco are:

Walmart – One of the world's largest retailers, operating a chain of hypermarkets, discount department stores, and grocery stores.

Target – Target is a discount retailer that sells a wide range of products, including clothing, electronics, and home goods.

BJ's Wholesale Club – BJ's Wholesale Club is a membership-based warehouse club that operates on the East Coast of the United States, offering bulk products at low prices to members.