Rivian Automotive Inc. and Volkswagen have launched their upsized joint venture, joining forces with the goal of creating “cutting-edge” electric-vehicle technology.

Shares of Rivian jumped over 15% after the EV maker announced a $5.8 billion investment from German automaker Volkswagen as part of their joint venture.

Last June, VW said it would invest $5 billion in Rivian as part of a new joint venture that’s focused on developing a new electrical architecture and vehicle software for future models, including subcompact cars, with the first planned for 2027. The investment size has now increased to $5.8 billion.