Live Odds · Updated October 24, 2026

OpenAI IPO Closing Market Cap

As of October 24, 2026, 07:45 PM ET, Polymarket traders price 1.5T+ at 37.6% in OpenAI IPO Closing Market Cap — $567.7K traded so far.

Last updated October 24, 2026, 07:36 PM ET with live prices from Polymarket. 24h volume: $1.3K.
Leading outcome
1.5T+
38%
A 37.6% price implies roughly a 38-in-100 chance, set by traders risking real money.
24H +0.4 pts7D −6.8 pts30D −22.8 pts
1.5T+37.6%
No IPO by December 31, 202729.1%
Bid
37¢
Ask
38¢
Spread
1¢
Trade on Polymarket →
Range since February 06, 2026: 8.8% – 80.8% · Opened at 25.5%

Market facts

Event data
Event
OpenAI IPO Closing Market Cap
Category
IPO, Business, Finance, AI, IPOs, Big Tech, OpenAI IPO, rewards 100, 4.5, 100 Deprec, OpenAI, Recurring
Scheduled end
December 31, 2027, 11:59 PM ET
Total volume
$567.7K
Volume (24h)
$1.3K
Liquidity
$131.4K
Markets
7
Leading outcome
1.5T+ — 37.6%

What is the current price?

Momentum & history

The leading outcome, 1.5T+, is priced at 37.6%.

Price changes for the leading market — 24 hours: +0.4 pts; past week: -6.8 pts; past month: -22.8 pts.

Since February 06, 2026, 1.5T+ has traded between 8.8% and 80.8%. It opened at 25.5% and last traded at 37.2%.

DayClose
Oct 16, 202644.5%
Oct 17, 202644.4%
Oct 18, 202645.1%
Oct 19, 202640.2%
Oct 20, 202641.5%
Oct 22, 202643.0%
Oct 23, 202637.2%

Who is favored to win?

Outcomes

1.5T+ is favored at 37.6%.

OutcomePriceImplied probability24h changeVolumeVolume share
1.5T+38¢37.6%+0.4 pts$146.4K25.8%
No IPO by December 31, 202729¢29.1%-3.2 pts$96.8K17.0%
1.25T–1.5T12¢11.5%-0.5 pts$77.7K13.7%
1T–1.25T6¢6.1%-0.1 pts$100.3K17.7%
750B–1T3¢2.9%—$72.3K12.7%
<500B2¢2.2%-0.1 pts$43.9K7.7%
500–750B2¢2.2%—$30.3K5.3%

See the full live book for this market on Polymarket

The leading market's spread is 1¢ (bid 37¢ / ask 38¢) — a tighter spread means cheaper round-trip trading.

How much has been traded?

Volume

$567.7K has been traded on this event in total, $1.3K of it in the last 24 hours, across 7 markets.

When does this market resolve?

Rules

This market is scheduled to end December 31, 2027, 11:59 PM ET.

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.

What do the biggest traders hold?

Top holders

The largest current holder of the leading market holds 21,491 shares of No.

HolderOutcome heldSharesValue at current price
0xa5ef39c3…No21,491$13.4K
Svelte-PedalYes7,001$2.6K
Original-KneeYes4,153$1.6K
Remarkable-CossetNo3,901$2.4K
Golden-UnemploymentYes2,381$895
Subdued-RevenantYes2,054$772
Guilty-WesternYes2,000$752
Narrow-PapaYes1,598$601
Present-LambkinYes1,426$536
Strict-BaconYes1,031$388

What are the latest trades?

Tape
BUY No — $2.3K at 58.0%BUY No — $936 at 59.1%SELL No — $791 at 92.7%
TimeOutcomeSidePriceSize
Oct 24, 07:25 PM ETYesSELL37.0%$11
Oct 24, 04:44 PM ETYesSELL37.0%$9
Oct 24, 03:12 PM ETYesBUY31.4%$1
Oct 24, 11:08 AM ETNoBUY73.0%$73
Oct 24, 10:14 AM ETNoBUY68.6%$69
Oct 24, 10:14 AM ETNoBUY69.0%$69
Oct 24, 10:14 AM ETNoBUY68.1%$211
Oct 24, 09:52 AM ETNoSELL62.1%$3
Oct 24, 08:59 AM ETNoBUY65.8%$33
Oct 24, 05:20 AM ETYesSELL30.6%$11

Related markets

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Frequently asked questions

FAQ

What are the odds of OpenAI IPO Closing Market Cap?

As of October 24, 2026, 07:36 PM ET, the leading outcome is 1.5T+ at 37.6%. Next is No IPO by December 31, 2027 at 29.1%. See the live book on Polymarket: https://polymarket.com/event/openai-ipo-closing-market-cap-554?via=bro

How much money has been traded on OpenAI IPO Closing Market Cap?

$567.7K in total volume, with $1.3K traded in the last 24 hours across 7 markets.

When does OpenAI IPO Closing Market Cap end?

The market is scheduled to end December 31, 2027, 11:59 PM ET.

What is the most likely outcome of OpenAI IPO Closing Market Cap, according to Polymarket traders?

1.5T+, priced at 37.6% as of October 24, 2026, 07:36 PM ET. Prices are implied probabilities backed by real-money trading.

Browse the live odds index, today's biggest movers, and Whale Watch for the largest positions.

⚠️ Not financial advice: odds swing hard on news. Never bet money you can't afford to lose, and always read a market's resolution rules before trading.

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