Uber will be investing $300 million into Lucid to help the company build a fleet of 20,000 (or more) robotaxis over the next six years. Nuro, another Uber partner, will be developing the autonomous driving technology integrated into Lucid's robotaxi fleet.

As part of their announced deal, Uber will invest hundreds of millions of dollars in Lucid and Nuro, which supply self-driving technology to carmakers, the joint statement said. Of that, $300m will go to Lucid, the EV maker said in a separate filing to the US Securities and Exchange Commission on Thursday.