xAI

Elon Musk's AI lab (founded 2023-03-09). Acquired by SpaceX in an all-stock deal closed 2026-02-02 — became a wholly-owned subsidiary (SpaceX $1T / xAI $250B / $1.25T combined), under common control (Musk owns both). May 2026: announced to fold into SpaceX's AI division. Earlier acquired X Corp (2025-03-28).