SpaceX or OpenAI higher IPO Market Cap?: live odds and probabilities
The market favorite is SpaceX at 83.6%, ahead of OpenAI at 16.4%. $13K traded across 2 outcomes.
Favorite
24h move
Volume
Closes
Elon MuskOpenAIIPOsBig TechSpace
All outcomes
| Outcome | Probability | 24h |
|---|---|---|
| SpaceX | 83.6% | +1.3 |
| OpenAI | 16.4% | -1.3 |
Prices are the Polymarket mid or last trade at 2026-11-06 03:02 UTC. A price of 64¢ implies roughly a 64% chance. Prices include spread and are not forecasts by BetG8.
Price history
Market rules and resolution
This market will resolve to “SpaceX” if the official closing price for SpaceX’s market capitalization on its first trading day is above the official closing price for OpenAI’s market capitalization on its first trading day. This market will resolve to “OpenAI” if the official closing price for OpenAI’s market capitalization on its first trading day is above the official closing price for SpaceX’s market capitalization on its first trading day. This market will resolve to the company that completes an Initial Public Offering (IPO) by December 31, 2027, 11:59 PM ET, if the other company does not complete an IPO within the market timeframe. This market will resolve to the IPOed company as soon as it becomes impossible for the other company to complete an IPO within the market timeframe, including due to acquisition, merger, or absorption by an entity that is already publicly traded. This market will resolve 50-50 if: - Neither IPO occurs by December 31, 2027, 11:59 PM ET. - Both SpaceX and OpenAI complete an IPO within this market's timeframe, and their IPO closing market capitalizations are exactly equal. - Both companies become unable to complete an IPO, including due to acquisition, merger, or absorption by an entity that is already publicly traded. 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 the respective companies’ 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.
How to read this market
Frequently asked questions
- Who is favored in "SpaceX or OpenAI higher IPO Market Cap?"?
- As of November 6, 2026, SpaceX is the favorite at 83.6%, followed by OpenAI at 16.4%.
- When does this market resolve?
- The market is scheduled to close on January 1, 2028. It resolves under Polymarket's rules once the outcome is known, which can be earlier or later than the listed date.
- How much has been traded?
- $13K in total and $0 in the last 24 hours, with about $546 of resting liquidity.
- Can I trade this market?
- Polymarket restricts access by location; the US version (Polymarket US) and the offshore site have different rules and fee schedules. Check availability in your jurisdiction. BetG8 earns a referral fee from the Polymtrade links on this page.
Related on BetG8
Data: Polymarket Gamma and CLOB APIs, fetched by BetG8 at the time shown above. Venues may restrict access by location. 18+ only.