Forecasters on Polymarket, the sole prediction market currently offering a contract on OpenAI's IPO valuation, assign a 20% probability to the company's market cap landing between $1 trillion and $1.25 trillion at market close on its first day of trading. This implies an 80% expectation that the valuation will either fall below $1 trillion or exceed $1.25 trillion, with the lower end seen as the more likely scenario given the absence of bullish catalysts in the current news cycle.
The $210,000 in volume wagered on this contract reflects modest but focused interest from traders, though the lack of data from other platforms like Kalshi or Manifold limits the ability to cross-validate the forecast. No specific external trigger has been identified in today's news flow to explain the current probability, which has remained stable over the past week.
Market participants appear to be pricing in skepticism about OpenAI's ability to sustain the lofty valuations seen in private funding rounds, where the company was reportedly valued at over $150 billion. The IPO, expected by mid-2026, faces headwinds from regulatory scrutiny and competitive pressures in the AI sector, factors that may temper investor enthusiasm on debut.