Analytics
Yes is at 42%, up 22 points from 20.5% when the market opened on 25 Oct 2026.
Across the 3 daily closes on record from 25 Oct 2026 to 28 Oct 2026 (2 days in that span have no close), the highest close was 42% on 28 Oct 2026 and the lowest 20.5% on 25 Oct 2026. Its largest one-day move was 10 points up, to 42% on 28 Oct 2026.
It is one of 7 markets under “OpenAI IPO closing market cap above ___ ?”.
The order book holds $90.77, with a 72.0% gap between the best bid and the best ask.
Trading closes on 1 Jan 2028.
Polymarket prices as of Oct 28, 9:50 PM UTC
Daily closes of the Yes price, Polymarket CLOB, 3 points, 25 Oct 2026 – 28 Oct 2026, chart shows 10%–50%
| Observed | Yes price |
|---|---|
| 25 Oct 2026 | 20.5% |
| 28 Oct 2026 | 42.0% |
Polymarket lists no holders for this market.
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This market will resolve to “Yes” if the official closing price for OpenAI's market capitalization on its first trading day is above the listed value. Otherwise, it will resolve to “No”. If no IPO occurs by December 31, 2027, 11:59 PM ET, this market will resolve to “No”. Market capitalization is defined as the total number of outstanding shares multiplied by the closing share price on the first trading day. 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.
Official listing: polymarket.com/event/openai-ipo-closing-market-cap-above
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