Not 100% sure how the Amazon/Zappos relationship is setup but I think it's odd that Zappos isn't mentioned anywhere in this or AFAIK anywhere in there investor

Not 100% sure how the Amazon/Zappos relationship is setup but I think it's odd that Zappos isn't mentioned anywhere in this or AFAIK anywhere in there investor documents. Does anyone now how Zappos is performing since being acquired? Especially with all of the controversy with their management styles? To be fair I'm sure Zappos is probably a small part of Amazon's revenue, but as a Las Vegas native I'm interested.