Amazon is now the second largest US company by headcount

"It's hard to imagine a company that already employed 382,400 people could grow its headcount 77% in just three months.
But that's exactly what Amazon did. At the end of September, the e-commerce giant employed 541,900 people, up 159,500 from the end of June.
The boost in employees mostly came from Whole Foods, which Amazon acquired in August. That deal added 90,000 people to Amazon's payroll. But even setting that deal aside, Amazon still brought on board 70,000 additional new employees.
An undisclosed number of those came from Souq.com, the Middle East's biggest e-commerce player, which Amazon also bought last quarter, Brian Olsavsky, Amazon's chief financial officer, told analysts during the company's quarterly conference call on Thursday. Excluding Whole Foods and Souq, Amazon's headcount would have grown 47%, Olsavsky said.
Amazon is now the second largest US company by headcount. However, it's still a long way behind Walmart, which has 2.3 million employees."

Source:  Business Insider, 27th October 2017