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OpenAI IPO closing market cap above X odds

The highest-priced market in “OpenAI IPO closing market cap above X” is $800B at 75% (+2.1 pts in the last 24 hours), ahead of $1T at 70%. Each market resolves on its own, so these prices do not have to add up to 100%.

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Prices refresh every few minutes. Probabilities are not predictions or advice, and you can lose what you trade.

Probability over the last 30 days

The top 4 outcomes right now.

Sep 26Oct 26
$800B$1T$1.2T$1.4T

All 7 outcomes and their odds

Probability is the share price. Decimal odds show what $1 returns if that outcome wins, before fees. American odds show the same price as a moneyline: +150 pays $150 on a $100 stake, −200 needs $200 to win $100.

Odds as of

Where this market stands

“OpenAI IPO closing market cap above X” is a Polymarket event with 7 open outcomes. $800B has the highest price at 75%, ahead of $1T at 70%. $800B is up 2.1 points over the last 24 hours and down 3.1 points over the past week. Traders have put $1.6M through the event so far, including $523 in the last 24 hours, and it is scheduled to end on January 1, 2028.

Whale trades in this market

The latest trades of $1,000 or more on this event, newest first.

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How this market resolves

This market will resolve to “Yes” if the official closing price for OpenAI's market capitalization on its first trading day is above the listed value. Otherwise, it will resolve to “No”.

If no IPO occurs by December 31, 2027, 11:59 PM ET, this market will resolve to “No”.

Market capitalization is defined as the total number of outstanding shares multiplied by the closing share price on the first trading day.

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.

Rules are written by Polymarket and shown as published. WhaleSays does not settle markets.

Common questions

New to this? Our guide covers how to make your first trade.

OpenAI IPO closing market cap above $800B?
Polymarket currently prices Yes at 75% in this market, which is decimal odds of 1.34 (American −298): $1 staked on Yes returns about $1.34 if it resolves Yes, before fees. In the last 24 hours the price moved up 2.1 points.

Related odds

Anthropic IPO Closing Market Cap

  • $1.75–$2.0T31%
  • $1.5–$1.75T20%
  • $2.0–$2.25T19%

$2.4M traded · $111K in 24h

What will Anthropic's IPO valuation be?

  • $1.50–$1.75T62%
  • $1.75–$2.00T19%
  • $1.25–$1.50T6%

$226K traded · $12K in 24h

In which month will Anthropic IPO?

  • November 202660%
  • December 202624%
  • January 20276%

$449K traded · $6,732 in 24h