A business Amazon launched a year ago has already generated $1 billion in revenue

​In its first year, Amazon Business has generated more than $1 billion in sales from more than 400,000 business customers, the company said during its earnings report released on Thursday.

Amazon Business wasn't exactly a started-from-scratch new unit, as VentureBeat reported at the time.

It launched at the end of April 2015 and replaced a service called AmazonSupply that had been around since 2012. AmazonSupply was a marketplace that focused more on industrial products and office supplies. It was Amazon's first attempt to get into the market occupied by warehouse retailers.

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