Volkswagen plans to invest up to $5 billion in electric vehicle startup Rivian, starting with an initial investment of $1 billion. The additional $4 billion is expected by 2026. It includes plans for $1 billion each in 2025 and 2026, followed by $2 billion in 2026 related to an expected joint venture to create electrical architecture and software technology, according to a release by the automakers Tuesday. Shares of Rivian soared roughly 40% during after-hours trading Tuesday, two days...