Costco Wholesale (NASDAQ: COST) continues to post encouraging fundamentals, as consumers become more encouraged to abandon coronavirus pandemic stay-in-place measures. On Thursday, the retailer released its latest set of monthly sales figures. These revealed that companywide net sales were nearly $15.6 billion in May, a robust 24% higher than in the same month last year. This was on the back of comparable sales that advanced by almost 23%. Online sales, meanwhile, rose at a 12% clip. Costco did note that May 2021 contained one extra shopping day compared to May of last year; it said this affected sales by roughly 2 to 2.5 percentage points. Image source: Getty Images. Loosened coronavirus restrictions and steep declines in COVID-19 case numbers, as is the trend in the company's core market of the U.S. just now, don't tell the whole story. Costco was a default shopping destination even in the thick of the pandemic, as customers considered its stores a reliable source of staple items like toilet paper and sanitizing products. As a result, and in contrast to a great many retailers who had to contend with mandatory shutdowns, Costco managed to grow its business. In the company's fiscal 2020, which ended last Aug. 30, its net sales rose by 9%. Looking at the first quarter of fiscal 2021 -- occurring as it did at the start of a fresh surge in coronavirus cases -- net sales growth was even higher, at 17%. At the end of May, Costco operated 809 warehouses. Of these, 559 are located in the U.S. and Puerto Rico, 105 are in Canada, and Mexico is home to 39. The remainder are scattered throughout Europe and Asia. Investors have been bullish on Costco for weeks, and Thursday was no exception. The company's stock rose by almost 0.9%, while the S&P 500 slipped by 0.4%. 10 stocks we like better than Costco WholesaleWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the ten best stocks for investors to buy right now... and Costco Wholesale wasn't one of them! That's right -- they think these 10 stocks are even better buys. See the 10 stocks *Stock Advisor returns as of May 11, 2021 Eric Volkman has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Costco Wholesale. The Motley Fool has a disclosure policy.Source