As of 00:16 UTC on 23 Oct 2026, the highest-priced of the 7 markets in “OpenAI IPO closing market cap above ___ ?” on Polymarket are “$800B” at 74% (-3pp in 24h), “$1T” at 67% and “$1.2T” at 59% (+3pp in 24h). The event has $2.7k in Polymarket-reported 24-hour volume. pdata.world tracks it alongside markets from 8 prediction-market platforms.
vol cum
$1.6M
vol 24h
$2.7k
outcomes
7
ends
Jan 1, 2028
outcomesclick to inspect →
showing 5 of 7
FinanceIPOsAIBig TechOpenAIBusinessIPOsam altman
marketselected outcome
$800B
rank #1
74¢
▼ 3.0pp
24h change
vol cum
$128.2k
vol 24h
$1.9k
spread
0.04
ends
Jan 1, 2028
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.
