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OpenAI IPO Closing Market Cap

Event Group
EventPOLYMARKET

OpenAI IPO Closing Market Cap

OpenAI IPO Closing Market Cap
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Vol

$487.3K

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Markets

7

Market snapshot: Oct 16, 2026, 12:00 AM UTC. Prices may have changed.

Market Price Graph

7 markets tracked

Will OpenAI’s market cap be $1.5T or greater at market close on IPO day by December 31, 2027?

polymarket

No data available

All Markets(7)
MarketOutcome price
Will OpenAI’s market cap be $1.5T or greater at market close on IPO day by December 31, 2027?
Yes 46.0%
Will OpenAI not IPO by December 31, 2027?
Yes 24.8%
Will OpenAI’s market cap be between $1.25T and $1.5T at market close on IPO day by December 31, 2027?
Yes 11.5%
Will OpenAI’s market cap be between $1T and $1.25T at market close on IPO day by December 31, 2027?
Yes 4.6%
Will OpenAI’s market cap be between $750B and $1T at market close on IPO day by December 31, 2027?
Yes 2.6%

Event Overview

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.

Market Resolution RulesSame rules for all markets

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.

Saved descriptions match across 7 contracts. Check each contract on the provider for its full terms.

Important Notes

  • Markets resolve based on official data sources specified in the rules
  • Resolution may be delayed if official data is not immediately available
  • Polymarket uses UMA protocol for dispute resolution when necessary
  • Always verify the exact resolution criteria before trading

Markets (7)

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POLYMARKETFinance
Will OpenAI’s market cap be $1.5T or greater at market close on IPO day by December 31, 2027?

Will OpenAI’s market cap be $1.5T or greater at market close on IPO day by December 31, 2027?

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.

LiquidityLOW
Yes outcome46.0%
Yes
Volume$130.6K
Liquidity$5.8K
End DateJan 01, 2028
View Details
POLYMARKETFinance
Will OpenAI not IPO by December 31, 2027?

Will OpenAI not IPO by December 31, 2027?

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.

LiquidityLOW
Yes outcome24.8%
Yes
Volume$93.4K
Liquidity$9.9K
End DateJan 01, 2028
View Details
POLYMARKETFinance
Will OpenAI’s market cap be between $1.25T and $1.5T at market close on IPO day by December 31, 2027?

Will OpenAI’s market cap be between $1.25T and $1.5T at market close on IPO day by December 31, 2027?

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.

LiquidityMEDIUM
Yes outcome11.5%
Yes
Volume$56.6K
Liquidity$11.2K
End DateJan 01, 2028
View Details
POLYMARKETFinance
Will OpenAI’s market cap be between $1T and $1.25T at market close on IPO day by December 31, 2027?

Will OpenAI’s market cap be between $1T and $1.25T at market close on IPO day by December 31, 2027?

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.

LiquidityMEDIUM
Yes outcome4.6%
Yes
Volume$64.8K
Liquidity$30.8K
End DateJan 01, 2028
View Details
POLYMARKETFinance
Will OpenAI’s market cap be between $750B and $1T at market close on IPO day by December 31, 2027?

Will OpenAI’s market cap be between $750B and $1T at market close on IPO day by December 31, 2027?

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.

LiquidityMEDIUM
Yes outcome2.6%
Yes
Volume$68.8K
Liquidity$40.5K
End DateJan 01, 2028
View Details
POLYMARKETFinance
Will OpenAI’s market cap be less than $500B at market close on IPO day by December 31, 2027?

Will OpenAI’s market cap be less than $500B at market close on IPO day by December 31, 2027?

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.

LiquidityMEDIUM
Yes outcome2.5%
Yes
Volume$42.9K
Liquidity$15.8K
End DateJan 01, 2028
View Details
POLYMARKETFinance
Will OpenAI’s market cap be between $500B and $750B at market close on IPO day by December 31, 2027?

Will OpenAI’s market cap be between $500B and $750B at market close on IPO day by December 31, 2027?

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.

LiquidityMEDIUM
Yes outcome1.8%
Yes
Volume$30.2K
Liquidity$10.8K
End DateJan 01, 2028
View Details

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