**SpaceX's post-IPO performance and Tesla share price movements remain the dominant drivers of Elon Musk's net worth trajectory through September 30.** As of late August 2026, estimates place his fortune near $862–868 billion, with roughly 82% tied to SpaceX (including the xAI integration) at around $140 per share and 16% from Tesla holdings near $346. The leading market-implied probabilities on the $1.10T+ and $1.00–1.10T ranges reflect trader expectations of a near-term rebound in these equities amid broader tech sector sentiment, while the clustered probabilities in the $700–900B bands capture the risk of continued volatility following the sharp June correction after SpaceX's debut. Key near-term catalysts include any updates on SpaceX operational milestones, Tesla's AI and vehicle delivery trends, and macroeconomic signals affecting high-growth tech valuations, all of which can swing Musk's equity exposure by tens of billions in days given the concentrated holdings. Lockup restrictions on much of the SpaceX stake limit immediate liquidity but do not cap price-driven valuation shifts before the resolution date.