(Reuters) - Shares of Rivian jumped over 13% in premarket trading Wednesday after the electric vehicle maker announced a $5.8 billion investment from German automaker Volkswagen as part of their joint venture. The investment boost comes at a crucial time ...

Rivian Automotive shares soared Wednesday, a day after the electric vehicle manufacturer expanded its partnership with Volkswagen in a move aimed at helping both firms find ways to grab more of the market for EVs.

Rivian and Volkswagen Group have finalized a multibillion-dollar joint venture to develop software, paving the way to let the German auto giant leverage the EV startup’s more technical chops in the coming years. Volkswagen will invest up to $5.8 billion by 2027, about 16% more than when the deal was first announced in June.