OpenAI IPO Closing Market Cap
Live
- $6.4K
- $211.4K
- 18
- $37.9K
- $135.3K
The leading questions, over time
Chance of Yes for the 4 questions with the highest chance now.
- 1.5T+50.8%
- No IPO by December 31, 202723.4%
- 1.25T–1.5T8.5%
- 1T–1.25T3.8%
Order-book mid of each question’s Yes side; each line ends at the live price shown above. Times are UTC.
Questions in this event
7 openChance of Yes. Each row is its own question with its own page. The Yes prices of the 7 open questions add up to 93.5¢.
- 50.8 %
1.5T+
$6.0K traded, 24 h
Yes 50.8¢No 49.2¢ - 23.4 %
No IPO by December 31, 2027
$359.74 traded, 24 h
Yes 23.4¢No 76.6¢ - 8.5 %
1.25T–1.5T
$2.41 traded, 24 h
Yes 8.5¢No 91.5¢ - 3.8 %
1T–1.25T
$1.13 traded, 24 h
Yes 3.8¢No 96.2¢ - 2.6 %
750B–1T
$1.01 traded, 24 h
Yes 2.6¢No 97.4¢ - 2.5 %
<500B
Yes 2.5¢No 97.5¢ - 1.8 %
500–750B
Yes 1.8¢No 98.2¢
Event facts
- Category
- Finance · IPOs
- Series
- OpenAI IPO
- Structure
- Exactly one question can win
- Fee
- 4% × p × (1−p) · taker only · 25% maker rebate
- UMA bond
- $500
- Resolver
- UMA CTF Adapter v3
- Questions
- 7 open
- Fills, last 24 h
- 32
- Polymarket-reported 24h volume
- 13,754 shares
- Created
- First trade
Who is trading this event
How does this event settle?
Rules, as written by Polymarket
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.
This event has 7 questions and exactly one of them can win: when one settles Yes, every other settles No.
Each question is its own Yes/No market: a share of the side that wins pays 100¢, the other side pays 0¢.
It can settle from Jan 1, 2028 04:59 UTC; trading can go on after that until the result is final.
Prices as of Oct 15, 2026 01:32 UTC; volume from on-chain fills over the last 24h. Trading data is ours; event metadata comes from Polymarket. Not affiliated with Polymarket · Not investment advice.