Prediction market bets $119K on OpenAI’s valuation dropping to $750B by year-end

Somewhere on Polymarket, traders have put between $119K and $132K behind the idea that OpenAI’s IPO closing market cap will land in the $500B to $750B range. The catch: the market itself thinks there’s only a 4-6% chance that actually happens.

That’s a bet against a company currently valued at $852B on private markets.

What the Polymarket contract actually says

The contract in question asks traders to predict OpenAI’s IPO closing market capitalization, broken into various brackets. The $500B to $750B bracket, which would represent a meaningful haircut from the company’s last private valuation, has attracted a respectable amount of volume despite its long-shot odds.

But the real star of the contract isn’t any valuation bracket. It’s the “No IPO” outcome, which commands a probability of 62-67%. In other words, roughly two-thirds of the money thinks OpenAI simply won’t go public before the deadline.

The original market sentiment had pegged an 18% chance of OpenAI’s valuation falling to $750B by year-end, though Polymarket’s conditional pricing for that bracket in an IPO scenario has since compressed to the low single digits.

OpenAI’s valuation trajectory

OpenAI raised $122B in March 2026, a round that valued the company at $852B post-money. Secondary market implied valuations have pushed even higher, reaching around $894B as of late August 2026.

There’s also the Sam Altman factor. Reports from June 2026 indicated that OpenAI’s CEO has expressed a clear preference: no IPO unless the company can command a valuation above $1 trillion. Some analysts have speculated that this $1T threshold could push any potential IPO into 2027.

Why anyone would take the other side

Discussions in late 2025 actually centered on $750B as a target valuation for potential fundraising. The jump to $852B happened quickly, and quick jumps can reverse.

There’s also a structural argument about IPO discounts. If OpenAI were to IPO in a risk-off environment, a $750B market cap would represent roughly an 11-12% discount to the March 2026 private round, which is within the range of historical IPO haircuts for overvalued tech companies.

What this tells us about IPO market sentiment

The fact that traders are pricing a nearly two-thirds probability of no IPO at all reflects deep uncertainty about the public market window for mega-cap tech listings. OpenAI’s apparent willingness to wait for a valuation above $1 trillion only reinforces that pattern.

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