
+0.1%
Will Microsoft be the largest company in the world by market cap on June 30?
24h Vol
$473.8K
Liquidity
$212.8K
Spread
0%
6/30/2026
View marketFinance
Polymarket market
Track live probability, outcome prices, volume, liquidity, and resolution details for Will OpenAI’s market cap be $1.5T or greater at market close on IPO day?. The market currently shows a live probability of 22%, $3K in 24h volume, and $7.1K in liquidity.
Probability
22%
24h Volume
$3K
Liquidity
$7.1K
This market asks whether OpenAI’s equity value on its first public trading day will end up at $1.5 trillion or more, using the official closing price on IPO day. It is worth watching because the threshold is unusually high and depends not just on investor demand, but also on how the company is priced, how many shares are outstanding, and what the market assigns to OpenAI once it starts trading.
The event is OpenAI’s first day of trading after an IPO, if one happens by December 31, 2026 at 11:59 PM ET. The question is whether OpenAI’s market capitalization at the closing price on that first trading day will be at least $1.5 trillion; if no IPO occurs by the deadline, the market resolves to "No IPO by December 31, 2026." Resolution is based first on the primary exchange’s official listing page, with another reliable source allowed if the figure is not displayed.
A first-day market cap can be hard to pin down because it depends on the final trading price, the number of shares counted as outstanding, and whether the company’s listing materials or exchange page present the value clearly. OpenAI is a widely followed company, so the market is really pricing a mix of expectations about its public debut, investor enthusiasm, and whether the listed valuation clears a very large benchmark right away. The uncertainty is not just about whether OpenAI goes public, but whether its opening-day valuation lands above a very specific threshold.
The biggest drivers are concrete IPO milestones: whether OpenAI files, sets an offering price, determines the float, and actually begins trading before the deadline. Any change in the implied valuation range before the offering, or a first-day trading price that pushes the closing market cap near $1.5 trillion, would matter directly. The market can also shift if the IPO timeline slips, if the listing structure changes, or if exchange materials make the expected share count and valuation more or less clear.
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+0.1%
24h Vol
$473.8K
Liquidity
$212.8K
Spread
0%
6/30/2026
View marketThe current market price implies roughly a 22% chance for the leading outcome, based on live Polymarket pricing. That number is not a prediction from PredictionNinja and it is not a guarantee; it is the current crowd-priced view of the market and can change quickly when new information appears.
Readers should watch for the IPO itself, the official first-day close, and the exchange listing page or another reliable source that states the company’s market capitalization or the inputs needed to calculate it. The deadline matters because if no IPO occurs by December 31, 2026, the market resolves to the no-IPO outcome regardless of earlier speculation. One ambiguity to check is how the listing source reports the figure if trading is interrupted or the official close is delayed, since the rules say an abbreviated-session close or the next official close may be used in those cases.
Track live probability, outcome prices, volume, liquidity, and resolution details for Will OpenAI’s market cap be $1.5T or greater at market close on IPO day?. The market currently shows a live probability of 22%, $3K in 24h volume, and $7.1K in liquidity.
Track live finance prediction markets focused on interest rates, inflation, stock market events, central bank decisions, and global financial forecasting trends.
Yes
21.7%
No
78.4%
This market is currently listed with an end date of Jun 30, 2026. Market timelines can change if the underlying event is postponed, rescheduled, or resolved early.
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.
Probability signal
The current price implies a lower-probability outcome, which can make the market more sensitive to surprise news.
Liquidity context
Liquidity is present but not especially deep, so spreads and order-book movement still matter.
Spread
The bid-ask spread is wider, so the headline probability may be less precise than it looks.
Recent movement
The 24h move is modest, suggesting the market has not repriced dramatically in the latest feed.
The current displayed probability is 22%, based on the latest normalized Polymarket data available to PredictionNinja.
The rules and resolution criteria are pulled from the market description provided by Polymarket when available.
Prediction markets can move whenever traders react to new information, liquidity changes, injuries, announcements, news, or other event-specific developments.
No. PredictionNinja displays market data and context for research only. It is not financial, legal, betting, or investment advice.

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