Recent trader consensus around $800B–$1T for Elon Musk’s net worth on September 30 reflects SpaceX’s post-IPO valuation swings and Tesla’s stock performance as the dominant drivers. SpaceX, representing roughly 80% of his holdings with a lockup until mid-2027, has stabilized after June’s peak above $1.4T and subsequent tech-sector pullback tied to AI infrastructure concerns, while Tesla shares near $350–$376 trade lower following the Cybercab robotaxi event’s mixed reception and new NHTSA scrutiny. Broader market sentiment on autonomous driving timelines, large language model progress via xAI, and macro rate expectations continue to influence implied probabilities, with limited near-term catalysts expected before month-end.