Online spending across U.S. retailers reached $8.3 billion on the first day of Amazon.com Inc.’s annual Prime Day event, surpassing earlier estimates of $7.9 billion, according to data from Adobe Inc. The four-day sale, which began this year in late June, is projected by Adobe to generate a total of $26.3 billion in online sales, marking a 9 percent increase compared to last year’s Prime Day held in July.

Adobe, which monitors website traffic and sales activity for a broad range of retailers, attributed the strong performance not only to Amazon’s promotions but also to overlapping sales events from competitors such as Walmart Inc. and Target Corp. These rival promotions contributed to increased consumer engagement and shopping volume across multiple retail platforms.

The event is closely watched by analysts and businesses as a barometer of consumer sentiment and spending patterns amid ongoing economic uncertainties. On the first day, shoppers primarily focused on discounts for electronics, appliances, tools, and home and garden products. Adobe also highlighted a solid demand for everyday essentials, indicating that consumers continue to prioritize both discretionary and necessary purchases.

Overall, the sales figures suggest sustained consumer appetite during Prime Day, supporting expectations for robust e-commerce activity throughout the four days of the event.