You can thank Diego Piacentini, the architect of Prime Day, for one of the biggest online retail events of the year.

So Piacentini pitched Jeff Bezos on Amazon having its own event, and Bezos was into it, thinking the primary goal would be to drive sales to Prime, the company’s subscription service.

Amazon founder Jeff Bezos sold another batch of company shares worth $1.5 billion under a 10b5-1 plan. He has sold over $2.3 billion worth of the stock in July, weeks after his marriage to Lauren ...