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.

The partnership gives Hertz, known for its car rentals, more visibility and a potential profit boost for its auto sales business.

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.