Amazon's Prime Day boosts US online sales to $6.4bn, marking the single-biggest e-commerce day of the year so far, according to Adobe Analytics. The event, which runs from Tuesday to Wednesday and aims to deepen existing members' loyalty, saw Prime Day shoppers spending more per order than last year. Adobe expects US online sales to grow 9.5% YoY to $13.1bn during the two-day event, and analysts believe Prime Day 2023 has generated a spike of spending across retail. Amazon stock maintains an outperform rating, with third parties such as Adobe and Salesforce set to announce total online sales from the event on Thursday.