Amazon said that shoppers purchased more than 375 million items during the two-day sale event on July 11 and 12, up from 300 million items sold last year.
U.S. consumers spent 12.7 billion U.S. dollars, a 6.1 percent growth year over year, according to Adobe Analytics data.
The first day of Amazon's Prime Day event saw U.S. sales rise nearly 6 percent year over year to 6.4 billion dollars. Consumers spent 6.3 billion dollars on the second day of the Prime Day event, up 6.4 percent year over year.
Customers also spent more per order this year, with an average order volume of 54.05 dollars, up from 52.26 dollars during last year's Prime Day event, according to data firm Numerator.
Amazon held its first Prime Day event in 2015. Last year, it had two Prime Day sales on July 12-13 and Oct. 11-12.
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