Overstock's third-party auctions marketplace has closed down permanently.

A message on the site simply says "We are sad to announce that the O.co Marketplace (Auctions) has closed. We extend our gratitude to all of you who helped make the O.co Marketplace an exciting place for both buyers and sellers. We encourage you to visit our other O.co websites, where you can find great savings on brand-name merchandise, cars, and even vacations."

Overstock Auctions was well supported with twenty compatible software tools and utilities, including ChannelAdvisor Marketplaces, Kyozou, Zoovy and their own O-Lister.