Costco Wholesale Corp. ecommerce sales grew at nearly twice the rate of net sales in Q3, which also marked the sixth consecutive quarter of double-digit year-over-year online growth.
Costco net sales in Q3 reached about $61.97 billion. That’s up 8.0% from $57.39 billion in the year-ago period. And fiscal year to date, Costco sales grew to $185.48 billion, up 8.2% from $171.44 billion a year ago for the first three quarters.
Total Costco revenue reached about $63.21 billion in Q3, up from about $58.52 billion the prior year.
In the U.S., comparable sales grew 6.6% year over year in Q3. Traffic increased 5.2% worldwide and 5.5% in the U.S., chief financial officer Gary Millerchip told investors.
Costco is No. 7 in the Top 2000 Database. The database is Digital Commerce 360’s ranking of the largest online retailers in North America by their annual ecommerce sales. It’s also the fourth-largest Mass Merchant in the database.
Costco is among the “Big Four” Mass Merchants that Digital Commerce 360 covers in depth as part of the 2025 State of American Ecommerce Report.
How Costco is addressing tariffs
About a third of what Costco sells in the U.S. is imported, Millerchip told investors. Of that, about two-thirds are non-food sales. Items that Costco imports from China represent about 8% of total U.S. sales, he added.
Still, Costco continues to make adjustments to its supply chain.
“As we navigate an evolving environment with tariffs, we are working closely with our suppliers to find ways to mitigate the impact on cost, including moving production and sourcing to other countries where it makes sense to do so,” Millerchip said.
And in the U.S., Costco is “sourcing more American-made goods where available,” according to Millerchip. That includes mattresses, pillows and plastic resin goods.
“While the spot rate for shipping containers has increased recently in response to a short-term increase in demand during the window that reciprocal tariffs have been paused, our shipping is generally covered by contracts, and so we have not seen any material impact,” Millerchip said.
President and CEO Ron Vachris told investors on Costco’s earnings call that the retailer’s merchandising team maintained its competitive price position “despite a challenging macroeconomic backdrop.” Part of that came from its Kirkland Signature brand, the sales of which also outpaced overall Costco sales growth.
“We continue to move more Kirkland Signature product sourcing into the countries or regions where the items are sold, and this has helped bring us to lower cost and mitigate some of the potential impacts of tariffs,” Vachris told investors. “We’re remaining agile as a situation with tariffs evolves, while also supporting the commitments we’ve made with our long-term suppliers.”
He added that in Q3, Costco rerouted many goods it sources from countries with large tariff exposure to its non-U.S. markets. And in the U.S., it pulled forward items it had planned for the summer and sourced more locally produced goods to reduce tariff impacts and ensure products were in stock.
Costco ecommerce sales Q3
In its fiscal Q3 2025, Costco ecommerce sales grew 14.8% year over year. And fiscal year to date, Costco ecommerce sales have grown 16.4% compared to the same period in 2024.
During its Q3, Costco launched buy now, pay later (BNPL) for ecommerce sales, partnering with payment provider Affirm.
Millerchip said among the ecommerce successes Costco had in Q3 were a targeted Mother’s Day campaign and its launch of a personalized product recommendation hub for members. The Mother’s Day campaign targeted those who had purchased a traditional Mother’s Day gift in 2024. The recommendation hub showcases items based on previous browsing history, new items a consumer might find relevant and best-selling items in the consumer’s area.
Also in Q3, Costco grew ecommerce sales in the double digits year over year for:
- Apparel
- Gold and jewelry
- Health and beauty
- Housewares
- Majors
- Small electronics
- Toys
It has also grown its share of big and bulky items it sells online, which Millerchip attributed to investments in Costco Logistics. The service, which includes installation and haul away of old items, increased the number of items it delivered in the quarter by 31%.
Sales on Costco Next, the retailer’s online marketplace, also grew year over year. Costco Next sales in Q3 equaled its total sales for all of the retailer’s fiscal 2022, Millerchip said.
How many members does Costco have?
Costco ended its Q3 with 79.6 million paid household members. That’s up 6.8% year over year. It’s also an increase from 78.4 million in Q2.
Of those, 37.6 million had paid executive memberships — 9% more than in Q3 of its fiscal 2024. Executive members represented 47.3% of paid members, yet 73.1% of worldwide Costco sales.
Costco also ended Q3 with 142.8 million cardholders, a 6.6% increase. That’s also up from 140.6 million cardholders in Q2.
In Q3, Costco generated $1.24 billion in membership fee income. That’s 10.4% year-over-year growth, or an increase of $117 million. At the end of Q3, Costco’s U.S. and Canada membership renewal rate was 92.7%. Worldwide, it was 90.2%.
How many countries have a Costco?
As of the end of its fiscal Q3 2025, Costco operates 905 warehouses. Of those, 624 are in the United States and Puerto Rico. Listed by amount, the rest are in:
- Canada (109)
- Mexico (41)
- Japan (37)
- The United Kingdom (29)
- South Korea (19)
- Australia (15)
- Taiwan (14)
- China (7)
- Spain (5)
- France (2)
- Iceland (1)
- New Zealand (1)
- Sweden (1)
Costco operates ecommerce sites in:
- Australia
- Canada
- Japan
- Mexico
- South Korea
- Taiwan
- The United States
- The United Kingdom
Percentage changes may not align exactly with dollar figures due to rounding. Check back for more earnings reports. Here’s last quarter’s update on Costco ecommerce sales.
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