OpenAI IPO Closing Market Cap

Polymarket Finance › IPOs & deals Closes Dec 31 · $185 today · $2.5M traded · $123K at stake · prices read 13 min ago

The odds

96%No IPO by December 31, 2026

No IPO by December 31, 202696%▼ 1
1.5T+1%
<500B1%
750B–1T1%
1T–1.25T<1%
500–750B<1%
1.25T–1.5T<1%

How the odds have moved

No IPO by December 31, 2026: 97% on Oct 20, 96% now.

Each outcome's chance over time on Polymarket. The dots along the bottom are headlines about its subject: point at one to read it.

Every outcome

Outcome	Chance	Day	Bid	Ask	Pays	Traded
No IPO by December 31, 2026	96%	▼ 1	96¢	96¢	$1.04	$834K
1.5T+	1%		1¢	1¢	$100.00	$164K
<500B	1%		1¢	1¢		$324K
750B–1T	1%		1¢	1¢		$187K
1T–1.25T	<1%		0¢	1¢		$228K
500–750B	<1%		0¢	1¢		$177K
1.25T–1.5T	<1%		0¢	1¢		$536K

"Pays" is what a $1 stake returns if that outcome happens, at the price shown (before any fees). Bid and ask are the best prices to sell and buy "Yes".

The news: OpenAI, ChatGPT, OpenAI IPO Closing Market Cap

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Paxton Sues OpenAI and Sam Altman, Seeks to Block Minors From ChatGPT@cdnnow · 20 h agoTexas Attorney General Ken Paxton has sued OpenAI and CEO Sam Altman, accusing the ChatGPT maker of marketing its chatbot as safe while failing to protect Texans, including children. The lawsuit, filed Friday in Collin County district…
Sweden's Government Offices Block ChatGPT and Claude, Keep Microsoft CopilotDecrypt · 37 h agoSweden's Government Offices—the administrative body supporting the prime minister and cabinet—will block ChatGPT and Claude on staff computers from Monday, directing civil servants to Microsoft's Copilot as the only approved AI tool…
Texas Sues OpenAI, Altman Over ChatGPT Safety Claims@law360 · 2 days agoThe Texas attorney general's office sued OpenAI and its chief executive Sam Altman in state court Friday, alleging the company breached consumer protection laws by unleashing a chatbot that often gives harmful advice and is addictive to…
Chatbot AI Service Comparison: OpenAI ChatGPT vs Claude vs Gemini (for CRM Actions)DEV Community · 36 h agoShort answer: Choose OpenAI ChatGPT for dynamic casual dialogue, Claude for explainable complex reasoning, and Gemini when minimal-response latency dominates; keep all three behind one CRM action contract. The boundary is simple: the model…
Intapp Launches Celeste Plug-in for OpenAI's ChatGPT EnterpriseMarketScreener · 3 days agoIntapp said Thursday it is launching its Celeste plug-in for law firms on Microsoft-backed OpenAI's ChatGPT Enterprise. The company said Celeste is an AI coworker that was designed to handle... Intapp Launches Celeste Plug-in for OpenAI's…
Texas Attorney General Ken Paxton sues ChatGPT-maker OpenAI@kbtxnews · 3 days agoTEXAS (The Texas Tribune) - Attorney General Ken Paxton is suing OpenAI, the maker of ChatGPT, for allegedly deceiving and harming Texans. This is the latest in a flurry of lawsuits filed against Big Tech companies and private corporations…
Texas AG Ken Paxton sues OpenAI over ChatGPT safety claimsHouston Chronicle · 2 days agoTexas Attorney General Ken Paxton is suing technology company OpenAI for allegedly failing to protect Texans from the harms of using ChatGPT. Paxton speaks during a news conference with U.S. Energy Secretary Chris Wright in Houston on…
Paxton Sues OpenAI And Sam Altman Over Suicide Claims, Seeks ChatGPT Ban For Texas Kidswbap.com · 2 days agoTexas Attorney General Ken Paxton (R) sued OpenAI and CEO Sam Altman on Friday, accusing them of misleading Texans about ChatGPT’s safety and asking a court to bar the chatbot for minors in the state. The 67-page petition names six OpenAI…
What is OpenAI 'dots'? A Thorough Explanation of 5 Differences from ChatGPT and How to Get Started [2026 Edition]note（ノート） · 33 h agoFrom the 'era of asking AI questions' to the 'era of delegating work to AI'. A service that makes you feel such a change has been released by OpenAI. Its name is 'dots'. It is a new AI agent announced on September 29, 2026. ChatGPT until…
Human vs. ChatGPT NFL Week 7 betting picks: Human clings to profit as AI claims third straight winOutKick · 21 h agoColin Cowherd predicts the best bets entering Week 7 of the NFL season, including the Cincinnati Bengals, Atlanta Falcons, and Kansas City Chiefs. Apparently, the robot doesn't even have to make money to beat me anymore. ChatGPT finished…
OpenAI will stop training its models on the internet after cyber incidentsFox News · 39 h agoOpenAI, the company behind ChatGPT, will stop training its most advanced models on the internet. This comes after a string of cyber incidents ... OpenAI will stop training its models on the internet after cyber incidents OpenAI, the…
Fired OpenAI researchers say independent safety audits aren't going wellNPR · 2 days agoIn their first interview since being fired, OpenAI safety researchers Mikita Balesni and Tomek Korbak say they were terminated for prioritizing safety over the short-term interests of the company. Fired OpenAI researchers say independent…

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Finance › IPOs & deals

OpenAI IPO Closing Market Cap

38%1.5T+

1.5T+38%
No IPO by December 31, 202731%▲ 2
1.25T–1.5T12%▼ 1

4 more

1T–1.25T7%
750B–1T3%
<500B2%
500–750B2%

Finance › IPOs & deals

Anthropic IPO Closing Market Cap

28%$1.75–$2.0T

$1.75–$2.0T28%▼ 1
$2.0–$2.25T21%▲ 3
$1.5–$1.75T17%▼ 2

7 more

$2.25–$2.5T12%▲ 2
<$1.25T6%
$1.25–$1.5T6%▼ 3
No IPO by December 31, 20274%▲ 1
$2.5–$2.75T3%
$3.0T+2%▼ 1
$2.75–$3.0T1%

Finance › IPOs & deals

Anthropic IPO by __?

Nov 28, 2026even chance by

October 31, 2026<1%
November 15, 20266%▲ 4
November 30, 202661%▼ 3

2 more

December 15, 202682%▲ 9
December 31, 202683%▲ 7

Finance › IPOs & deals

What will OpenAI's IPO valuation be?

$1.48Tmedian

$750B$2.75T

Median $1.48TMiddle half $966.64B – $1.87T

Finance › IPOs & deals

What will Anthropic's IPO valuation be?

59%$1.50–$1.75T

$1.50–$1.75T59%▲ 1
$1.75–$2.00T16%▼ 5
$2.00–$2.25T4%

5 more

$1.25–$1.50T4%▲ 2
$2.25–$2.50T4%
$2.50T+2%
No IPO by December 31, 20272%
<$1.25T1%

Finance › IPOs & deals

When will Anthropic officially announce an IPO?

Nov 22, 2026even chance by

Before Nov 1, 20261%▼ 1
Before Dec 1, 202673%▲ 6
Before Jan 1, 202781%▲ 2

3 more

Before Feb 1, 202789%
Before Mar 1, 202792%▲ 1
Before Apr 1, 202794%▲ 2

Odds are traders' prices on Kalshi, Polymarket, ForecastEx and Crypto.com, not forecasts by 4Search. Prices read from the venues 4 min ago. Prices may be delayed. Money traded on Kalshi and ForecastEx is estimated from contracts. Not betting or investment advice.

About this market

VenuePolymarket

Trading closesDec 31, 2026 11:59 PM ET

Traded$2.5M

Today$185

This week$12.5K

At stake$123K

In the news128 headlines today, 1,787 this week

Followed here sinceOct 19, 2026

The rules

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

The full rules are on the market's page at Polymarket.

Reading the odds

A prediction market trades contracts that pay $1 if something happens. Its price is the market's chance: a contract at 62¢ means traders give it 62%. Each number here is the midpoint between the best bid and offer, or the last trade when they are more than ten cents apart.

For a question with many answers (who wins, which range a number lands in), the chances are scaled to add up to 100%. A price ladder ("above 4.25%, above 4.50% ...") gives a whole distribution: its median is where traders see an even chance either way.

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Prediction-market prices are what traders pay for each outcome on Kalshi, Polymarket, ForecastEx and Crypto.com, read as the market's implied chance. They are not forecasts by 4Search, can move fast and can be wrong; they are read every few minutes and may be delayed. Money traded on Kalshi and ForecastEx is estimated from contracts at their price. News comes from the 4Search index; prices of stocks, rates and coins from 4Search Finance. Nothing here is betting, financial or investment advice. Terms of use. How to use Predictions