OpenAI IPO Closing Market Cap
This market will resolve based on OpenAI's market capitalization at the closing price on its first day of trading. If no IPO occurs by December 31, 2027, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2027". Market capitalization expresses the monetary value of a company’s outstanding shares, stated …
As of 12 September 2026, "1.5T+" leads at 80% implied probability (-0.7pp over the last 24h). The biggest 24h move is "No IPO by December 31, 2027", from 4% to 7%. The event has traded $249.2K in total ($10.4K in the last 24h) with $84.4K of liquidity across 7 markets. Trading is due to close on 1 January 2028.
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Holders and activity
Markets and probabilities
7 marketsThe percentage is the implied probability of the outcome, between 0% and 100%. For mutually-exclusive markets the sum trends to 100% (no vig). The ▲/▼ arrow shows the change over the selected window (1h/24h/7d/30d) in percentage points (pp). Click a market to see its top holders (with average entry price and position change) and the latest trades.