As of 15:46 UTC on 27 Oct 2026, “1.5T+” leads “OpenAI IPO Closing Market Cap” on Polymarket at 38%, followed by “No IPO by December 31, 2027” at 30% and “1.25T–1.5T” at 14% (+1pp in 24h), out of 7 outcomes. The event has $302 in Polymarket-reported 24-hour volume. pdata.world compares it with 18 related events on Polymarket, Manifold, Limitless and Kalshi.
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 in its pricing currency. It is calculated as the number of shares outstanding multiplied by the closing share price on the first trading day.
If the relevant value falls exactly between two brackets, then this market will resolve to the higher range bracket.
Resolution will be based on the primary exchange’s official listing page. In the event that the relevant figure is not displayed, another reliable source will be used.
In the event of an interruption in the course of the normal trading session on OpenAI’s first day of trading (e.g., a circuit breaker or half-day), the market will resolve according to the official closing price of the abbreviated session. If no such official closing price is published, the market will resolve according to the next trading day on which an official closing price is published, treating that as the first day of trading for purposes of this market.
