Rivian won't even release its first electric truck until late 2020, but that isn't stopping the company from receiving its third big funding infusion this year. Cox Automotive, the company behind Autotrader and Kelley Blue Book, has made a $350 million equity investment in Rivian. The publications won't play much of a role, to be clear. Rather, this is about a chance to "explore partnership opportunities" in the other areas of Cox's business, including digital retail, logistics and service ops. Cox owns companies like Manheim, which services, transports and auctions cars worldwide.