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.

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.

The new agreement, which builds on an earlier announcement, calls for the German automaker to invest $5.8 billion in Rivian, a maker of electric vehicles.

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 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 for Rivian,

The announcement lifts the veil on one of the largest automotive deals this year, providing more details on its goals, leadership and financial structure.

Volkswagen will invest up to $5.8 billion in Rivian stock and a joint venture—up from a $5 billion deal value envisaged when the collaboration was announced in June. Rivian stoc