U.S. E-Commerce Sales Rise in 1st Quarter

U.S. retail e-commerce sales continued to rise during the first quarter, with sales from desktop computers climbing 12% and spending from mobile devices jumping 23% from a year earlier, according to market research firm comScore Inc. ( SCOR ).

Overall, U.S. retail e-commerce sales reached $63.4 billion in the quarter, including $56.1 billion in desktop-based sales. Consumers using smartphones and tablets contributed a combined $7.3 billion in sales, with smartphone-based sales comprising about 62% of the mobile purchases.

During the quarter, e-commerce and mobile-commerce spending growth accelerated modestly compared with the fourth quarter of 2013, said Gian Fulgoni, comScore chairman emeritus.

The growth "is a positive sign in light of overall softness in consumer discretionary spending across the broader U.S. economy during the early part of the year," Mr. Fulgoni said.

Desktop e-commerce accounted for 11.7% of consumers' discretionary spending, a record for the first quarter, according to comScore.

Write to Tess Stynes at tess.stynes@wsj.com

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