Trader consensus on Polymarket has locked in a 100% implied probability for Elon Musk's net worth falling in the 640-650 billion range as of March 31, 2026, driven by the Bloomberg Billionaires Index's authoritative daily update confirming $644 billion—reflecting a $11.7 billion (1.8%) single-day gain and $24.2 billion year-to-date increase. This positioning stems from Tesla's market cap hitting $1.39 trillion, bolstering Musk's ~11% stake plus 304 million exercisable options, alongside his 44% holding in the SpaceX-xAI combined entity valued at $1.03 trillion post-February merger, offset by modest liabilities like pledged shares. While near-certain, rare index revisions for private asset discounts or loan adjustments could theoretically challenge resolution, though traders price negligible risk.