Walmart Inc.’s pandemic-driven gains in e-commerce slowed last quarter and profit margin fell, raising questions about the retailer’s ability to maintain momentum even after it topped Wall Street’s sales expectations.

Lowe’s Cos. reported two key sales measures that missed analysts’ estimates last quarter despite a buoyant U.S. housing market.

In a sign of how much Walmart Inc. is betting on e-commerce, the retailer’s revamped credit-card program with Capital One Financial Corp. offers better rewards for online shopping and checking out with its mobile app.

The Home Depot Inc. failed to fully rebound from a lackluster end to last year, with the company saying a calendar adjustment added to the drag from wet weather. Tariffs also weighed on the stock, with the company saying that a recent increase in duties isn’t included in its guidance.

It was a cold winter for Lowe’s Cos., but sales largely held up. And now, CEO Marvin Ellison said demand for home improvement goods is starting to heat up, one day after rival Home Depot Inc. reported results that fell short.

Home Depot Inc. shares fell on Feb. 26 after the retailer said sales gains will start to cool off this year — mirroring a trend in the U.S. housing market.

The initial Black Friday results have reinforced that this U.S. holiday shopping season will be one of the best in recent memory. But even in good times, there are concerns for retailers.

Home-improvement retailer Lowe’s announced the closing of 51 underperforming stores Nov. 5, including two New York locations that the company hailed just three years ago as the way to win over city-dwellers.