The biggest Prime Day on record gave loyal consumers even more of a reason to love Amazon. Millennials shopped more conservatively during the sale this year, yet continued spending at other retailers. Meanwhile, retail competitors rode the wave of heightened buying intent. Here are five key stats on Prime Day that you didn’t know.

Calendar context: With the invention of Prime Day, Amazon created an industrywide retail holiday consumers can now count on in the summer each year. Last year, Amazon also launched its Prime Early Access Sale in October. “We now have three key tentpoles,” said our analyst Andrew Lipsman on “Behind the Numbers: Reimagining Retail,” referring to Prime Day, the Prime Early Access Sale, and Black Friday. But spring remains untapped. “A question I get is, ‘Is Amazon going to do more of these?’ And I think the answer is yes, eventually,” said Lipsman.