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Tech·Big Tech

OpenAI IPO Closing Market Cap

icon for OpenAI IPO Closing Market Cap
Tech·Big Tech

OpenAI IPO Closing Market Cap

Dec 31

Dec 31, 2027

Dec 31

Dec 31, 2027

No IPO by December 31, 2026 56%

750B–1T 13.5%

1.5T+ 12.3%

1T–1.25T 10.4%

Polymarket

$1,812,781 Vol.

No IPO by December 31, 2026 56%

750B–1T 13.5%

1.5T+ 12.3%

1T–1.25T 10.4%

Polymarket

$1,812,781 Vol.

<500B

$287,112 Vol.

1%

500–750B

$158,584 Vol.

1%

750B–1T

$162,869 Vol.

14%

1T–1.25T

$202,436 Vol.

10%

1.25T–1.5T

$512,368 Vol.

4%

1.5T+

$133,692 Vol.

12%

No IPO by December 31, 2026

$355,748 Vol.

56%

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, 2026, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2026". 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.OpenAI’s confidential S-1 filing in early June, advised by Goldman Sachs and Morgan Stanley, has set the stage for a potential late-2026 or early-2027 listing at a valuation near or above $850 billion. Trader consensus nonetheless assigns 56.5% probability to no IPO by December 31, 2026, reflecting CFO Sarah Friar’s repeated emphasis on the need for greater operational maturity, prior revenue shortfalls, and the company’s $14 billion projected 2026 losses. Competitive pressure from Anthropic’s parallel filing and broader market selectivity around unprofitable AI firms add execution risk. Key upcoming catalysts include the public S-1 release timeline and any updates on profitability runway.

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, 2026, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2026".

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.
Volume
$1,812,781
End Date
Dec 31, 2026
Market Opened
Sep 22, 2025, 8:18 PM ET

Resolver

0x2F5e3684c...
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, 2026, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2026". 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 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, 2026, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2026". 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.OpenAI’s confidential S-1 filing in early June, advised by Goldman Sachs and Morgan Stanley, has set the stage for a potential late-2026 or early-2027 listing at a valuation near or above $850 billion. Trader consensus nonetheless assigns 56.5% probability to no IPO by December 31, 2026, reflecting CFO Sarah Friar’s repeated emphasis on the need for greater operational maturity, prior revenue shortfalls, and the company’s $14 billion projected 2026 losses. Competitive pressure from Anthropic’s parallel filing and broader market selectivity around unprofitable AI firms add execution risk. Key upcoming catalysts include the public S-1 release timeline and any updates on profitability runway.

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, 2026, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2026".

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.
Volume
$1,812,781
End Date
Dec 31, 2026
Market Opened
Sep 22, 2025, 8:18 PM ET

Resolver

0x2F5e3684c...
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, 2026, 11:59 PM ET, the market will resolve to "No IPO by December 31, 2026". 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.

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Frequently Asked Questions

"OpenAI IPO Closing Market Cap" is a prediction market on Polymarket with 7 possible outcomes where traders buy and sell shares based on what they believe will happen. The current leading outcome is "No IPO by December 31, 2026" at 56%, followed by "750B–1T" at 14%. Prices reflect real-time crowd-sourced probabilities. For example, a share priced at 56¢ implies that the market collectively assigns a 56% chance to that outcome. These odds shift continuously as traders react to new developments and information. Shares in the correct outcome are redeemable for $1 each upon market resolution.

As of today, "OpenAI IPO Closing Market Cap" has generated $1.8 million in total trading volume since the market launched on Sep 23, 2025. This level of trading activity reflects strong engagement from the Polymarket community and helps ensure that the current odds are informed by a deep pool of market participants. You can track live price movements and trade on any outcome directly on this page.

To trade on "OpenAI IPO Closing Market Cap," browse the 7 available outcomes listed on this page. Each outcome displays a current price representing the market's implied probability. To take a position, select the outcome you believe is most likely, choose "Yes" to trade in favor of it or "No" to trade against it, enter your amount, and click "Trade." If your chosen outcome is correct when the market resolves, your "Yes" shares pay out $1 each. If it's incorrect, they pay out $0. You can also sell your shares at any time before resolution if you want to lock in a profit or cut a loss.

The current frontrunner for "OpenAI IPO Closing Market Cap" is "No IPO by December 31, 2026" at 56%, meaning the market assigns a 56% chance to that outcome. The next closest outcome is "750B–1T" at 14%. These odds update in real-time as traders buy and sell shares, so they reflect the latest collective view of what's most likely to happen. Check back frequently or bookmark this page to follow how the odds shift as new information emerges.

The resolution rules for "OpenAI IPO Closing Market Cap" define exactly what needs to happen for each outcome to be declared a winner — including the official data sources used to determine the result. You can review the complete resolution criteria in the "Rules" section on this page above the comments. We recommend reading the rules carefully before trading, as they specify the precise conditions, edge cases, and sources that govern how this market is settled.