
+3%
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24h Vol
$58.8K
Liquidity
$59K
Spread
1%
7/1/2026
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Polymarket market
Track live probability, outcome prices, volume, liquidity, and resolution details for Will OpenAI’s market cap be less than $500B at market close on IPO day by December 31, 2027?. The market currently shows a live probability of 3%, $107.5 in 24h volume, and $9K in liquidity.
Probability
3%
24h Volume
$107.5
Liquidity
$9K
This market is about whether OpenAI’s valuation, as measured by its market capitalization at the close of its first trading day, will come in below $500 billion. The question matters because an IPO would be a major public-markets test for one of the most closely watched AI companies, and the closing-day valuation would set the reference point for this market.
The event being tracked is OpenAI’s first day of public trading, if and when an IPO happens before December 31, 2027. The market resolves "Yes" if OpenAI’s market cap at the official closing price on IPO day is less than $500 billion, and "No" if it is $500 billion or higher; if no IPO occurs by the deadline, it resolves to "No IPO by December 31, 2027." The title’s date matters because the market is not just asking whether OpenAI goes public someday, but whether that happens on time for this cutoff.
OpenAI is widely known as a major AI company, so any eventual listing would likely draw intense attention from investors and the broader market. The uncertainty is not just whether an IPO will happen, but what price the market will assign on day one, which can depend on the offering structure, demand, and overall market conditions at the time. This market is pricing disagreement over whether the company’s first closing valuation would clear a very high threshold.
The biggest price-moving developments would be official signs that an IPO is actually moving forward, such as filing documents, selecting an exchange, or announcing an expected listing timeline. Updates that change expectations about how many shares would trade, the implied offer price, or the company’s scale at listing could also matter because they affect the first-day market cap calculation. On the other side, any indication that OpenAI will remain private past the deadline, or that the listing is delayed, would push the market toward the no-IPO outcome.
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+3%
24h Vol
$58.8K
Liquidity
$59K
Spread
1%
7/1/2026
View marketThe current market price implies roughly a 3% 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.
The key things to verify are the listing date, the primary exchange’s official closing price, and the share count used to compute market capitalization. The market rules say the primary exchange’s official listing page is the main source of truth, with another reliable source used only if the figure is not displayed; if trading is interrupted, the official closing price of the abbreviated session applies, or else the next official closing price becomes the reference. Readers should also watch the December 31, 2027 deadline carefully, because if no IPO happens by 11:59 PM ET, the market resolves to the no-IPO outcome rather than a valuation bracket.
Track live probability, outcome prices, volume, liquidity, and resolution details for Will OpenAI’s market cap be less than $500B at market close on IPO day by December 31, 2027?. The market currently shows a live probability of 3%, $107.5 in 24h volume, and $9K in liquidity.
Track live finance prediction markets focused on interest rates, inflation, stock market events, central bank decisions, and global financial forecasting trends.
Yes
3.4%
No
96.7%
This market is currently listed with an end date of Dec 31, 2027. 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, 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.
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 tight, which usually points to a more actively priced market.
Recent movement
The 24h move is modest, suggesting the market has not repriced dramatically in the latest feed.
The current displayed probability is 3%, 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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