SpaceX regains lead as favorite for biggest IPO of 2026 on Polymarket

Bettors swung back to Elon Musk's rocket company after a Reuters report showed investors trimming their Anthropic valuation expectations SpaceX is back on top in the race for the biggest IPO of 2026, at least according to the people putting money on it. On October 16, Polymarket odds showed the rocket company retaking the lead as favorite for the year’s largest public debut by market cap. The trigger was a cooling in valuation expectations for its main rival, Anthropic . The shift traces back to a Reuters report published on October 15. It said investors are now weighing a valuation of approximately $1.5 trillion for Anthropic’s upcoming IPO. That is a meaningful step down. Expectations had previously been pegged at around $2 trillion.

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