Your Amazon shopping cart could soon include a late-model used car from Hertz. The rental-car company has started selling its used vehicles directly to consumers through the online giant.Hertz shares soared as much as 17% on Wednesday after the company said it would sell its used cars on Amazon’s automotive marketplace.

The Hertz move could hit shares of car dealers or online platforms such as Cars.com. Amazon Auto represents competition for listings and used-car inventory. Carvana stock dropped 3.5% to $332.11. CarGurus stock slipped 2.1% to $31.78. Cars.com stock was off 0.6% at $12.17.

Amazon has given Hertz a new home for its used-car sales operations in a partnership that links one of the largest rental fleets in the country with the world’s biggest online retailer.