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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 69%

1.25T–1.5T 8.6%

1.5T+ 6.4%

1T–1.25T 4.8%

Polymarket

$1,603,473 Vol.

No IPO by December 31, 2026 69%

1.25T–1.5T 8.6%

1.5T+ 6.4%

1T–1.25T 4.8%

Polymarket

$1,603,473 Vol.

<500B

$261,102 Vol.

2%

500–750B

$142,616 Vol.

4%

750B–1T

$137,774 Vol.

4%

1T–1.25T

$179,460 Vol.

5%

1.25T–1.5T

$492,070 Vol.

9%

1.5T+

$96,927 Vol.

6%

No IPO by December 31, 2026

$293,523 Vol.

69%

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.Trader consensus on Polymarket heavily favors no OpenAI IPO by December 31, 2026 (68.5% implied probability), driven by a Wall Street Journal report last week revealing the AI lab missed 2026 revenue and user growth targets amid unsustainable compute spending projected at $121 billion by 2028. CFO Sarah Friar has internally challenged CEO Sam Altman's aggressive Q4 timeline, echoing concerns over operational readiness. The ongoing Elon Musk lawsuit—now in trial with Musk testifying this week—threatens to unwind OpenAI's for-profit conversion, potentially blocking public listing and eroding its $852 billion private valuation. While preparations continue, no S-1 filing has emerged, and historical AI product delays underscore execution risks ahead of year-end resolution.

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
$1,603,473
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.Trader consensus on Polymarket heavily favors no OpenAI IPO by December 31, 2026 (68.5% implied probability), driven by a Wall Street Journal report last week revealing the AI lab missed 2026 revenue and user growth targets amid unsustainable compute spending projected at $121 billion by 2028. CFO Sarah Friar has internally challenged CEO Sam Altman's aggressive Q4 timeline, echoing concerns over operational readiness. The ongoing Elon Musk lawsuit—now in trial with Musk testifying this week—threatens to unwind OpenAI's for-profit conversion, potentially blocking public listing and eroding its $852 billion private valuation. While preparations continue, no S-1 filing has emerged, and historical AI product delays underscore execution risks ahead of year-end resolution.

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
$1,603,473
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 69%, followed by "1.25T–1.5T" at 9%. Prices reflect real-time crowd-sourced probabilities. For example, a share priced at 69¢ implies that the market collectively assigns a 69% 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 $1.6 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 69%, meaning the market assigns a 69% chance to that outcome. The next closest outcome is "1.25T–1.5T" at 9%. 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.