Claim That Musk Holds a 38% SpaceX Stake Worth $688 Billion Is Wrong on Both Numbers

The claim states that Elon Musk holds approximately a 38% stake in SpaceX valued at approximately $688 billion. Both figures are wrong, and the dollar error is not a rounding issue — it is off by a factor of more than four. The verdict is partially false, with the valuation figure being the more serious and demonstrably impossible error.

Start with the math that kills the claim outright. Reuters reported in December 2024 that SpaceX conducted a tender offer valuing the entire company at approximately $350 billion. Axios independently confirmed that same $350 billion figure. If Musk owned 100% of SpaceX — every single share — his stake would still be worth only $350 billion. For his stake alone to reach $688 billion, as the claim asserts, SpaceX would need to be valued at roughly $1.81 trillion. That is more than five times the company's actual December 2024 valuation and would make SpaceX worth more than companies like Berkshire Hathaway or Visa. No credible source supports that figure.

The ownership percentage is also wrong, though less dramatically so. Bloomberg's Billionaires Index and reporting by the Wall Street Journal place Musk's SpaceX stake at approximately 42–47%, not 38%. Forbes, using the same ~$350 billion company valuation and that ownership range, estimates Musk's SpaceX holdings at roughly $130–165 billion. The 38% figure is not a catastrophic misread, but it consistently undershoots every credible estimate by several percentage points.

The strongest version of the claim might argue that SpaceX's valuation is on a steep upward trajectory — it rose from $210 billion in mid-2024 to $350 billion by December 2024 according to Reuters and Axios — and that a future valuation could eventually justify larger numbers. That trajectory is real. But a claim about a current stake must use current valuations, not speculative future ones. Projecting a valuation that does not yet exist and presenting it as today's fact is not a forecast — it is a misrepresentation.

The most likely origin of the $688 billion figure is a conflation of two separate things: Musk's total estimated net worth across all assets, which Bloomberg and Forbes placed in the range of roughly $300–400 billion across all holdings in early 2025, and his SpaceX stake specifically. Someone appears to have either applied his total net worth figure to SpaceX alone, or used a speculative long-range valuation without labeling it as such. The 38% ownership figure may stem from an older or less precise disclosure. Neither error is trivial — together they produce a SpaceX stake figure that is arithmetically impossible given the company's actual market valuation.

The manipulation pattern here is compounding inflation: take a real asset, understate the ownership percentage slightly to seem precise and credible, then dramatically overstate the valuation to produce a headline-grabbing number. The specificity of "38%" and "$688 billion" signals research when it actually signals fabrication or careless conflation. When you see a precise ownership percentage paired with a valuation figure, always check it against the most recent tender offer or funding round — those are the only hard anchors for a private company's worth.