Trade: OpenAI IPO Closing Market Cap
Resolution criteria on PolyGram: 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.
PolyGram is an on-chain prediction market where you trade YES or NO outcome shares with real USDC on Polygon. For this market, buy YES if you believe the event will happen, or NO if you think it won't. Your maximum loss is your stake — winning shares pay $1.00 each at resolution. Unlike sportsbooks, there is no house edge: prices are set by supply and demand from other traders and reflect the crowd's real-time probability.
- Liquidity
- $22K
- Total Volume
- $1.6M
- 24h Volume
- $223
- Open Interest
- $55K
Market outcomes
| <500B | 1% YES | 99% NO |
| 500–750B | 4% YES | 96% NO |
| 750B–1T | 2% YES | 98% NO |
| 1T–1.25T | 3% YES | 98% NO |
| 1.25T–1.5T | 3% YES | 97% NO |
| 1.5T+ | 11% YES | 89% NO |
| No IPO by December 31, 2026 | 69% YES | 32% NO |
Market context
OpenAI's potential initial public offering and its opening-day market capitalisation remain uncertain, with the settlement window extending through the end of 2026. The company, currently valued at approximately $157 billion in secondary markets following its October 2024 funding round, has not announced formal IPO plans or a timeline. The 1% implied probability on Polymarket's order book reflects substantial scepticism that a public listing will occur within the next two years, pricing in both the possibility of delayed capital markets conditions and OpenAI's stated preference for remaining private under its current governance structure.
Comparable technology IPOs offer limited precedent for valuation prediction at listing. When Nvidia went public in 1999, it opened with a market cap near $2.3 billion; by contrast, Arm Holdings' 2023 IPO valued the company at roughly $54.2 billion on day one, reflecting vastly different market conditions and company maturity. OpenAI's scale—generating estimated revenues exceeding $3.4 billion annually as of 2024—positions it differently from most pre-IPO tech firms, though comparable multiples remain speculative given the nascent nature of large language model commercialisation.
Traders monitoring this market should track regulatory developments affecting AI governance, changes in OpenAI's ownership structure (particularly regarding its for-profit subsidiary conversion), and broader technology sector sentiment. Recent statements from OpenAI leadership have emphasised near-term capital sufficiency through existing funding mechanisms. Any formal IPO announcement, SEC filing, or material shift in the company's strategic direction would substantially alter the probability distribution currently reflected in the order book.
Wikipedia Context
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OpenAI o1OpenAI o1 is a generative pre-trained transformer (GPT), the first in OpenAI's "o" series of reasoning models. A preview of o1 was released by OpenAI on September 12, 2024. o1 spends time "thinking" before it answers, making it better at complex reasoning tasks, science and programming than GPT-4o. The full version was released to ChatGPT users on December 5
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OpenAI o3OpenAI o3 is a reflective generative pre-trained transformer (GPT) model developed by OpenAI as a successor to OpenAI o1 for ChatGPT. It is designed to devote additional deliberation time when addressing questions that require step-by-step logical reasoning. On January 31, 2025, OpenAI released a smaller model, o3-mini, followed on April 16 by o3 and o4-mini
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OpenAI Codex (language model)
OpenAI Codex is a large language model developed by OpenAI for translating natural-language prompts into source code. Announced in 2021, it was a modified production version of GPT-3 that was fine-tuned on source code in multiple programming languages, and it served as the original model for GitHub Copilot.
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OpenAI o4-miniOpenAI o4-mini was a generative pre-trained transformer model created by OpenAI. On April 24, 2025, the o4-mini model was released to all ChatGPT users as well as via the Chat Completions API and Responses API. Its retirement from ChatGPT was announced on January 29, 2026, and it was retired on February 13, 2026.
How this market resolves
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a two-hour dispute window opens, and if no one stakes a counter-claim the payout is final. Contested outcomes escalate to UMA token-holder voting. Payouts clear in USDC to the winning side.
How to trade this market step by step
The mechanics for trading "OpenAI IPO Closing Market Cap" are the same as any other PolyGram event contract. Each YES share resolves to $1 if the event happens, or $0 if it doesn't. The current price between 0¢ and 100¢ is the market's probability estimate, set live by the order book.
- Sign in on polygram.ink with your email — no full KYC under $1,500 lifetime trading volume.
- Deposit USDC on Polygon (lowest fees, ~$0.01 per transaction) or Ethereum. Funds credit after 12 confirmations.
- Pick a side. Buy YES if you believe the event will happen; buy NO if you think it won't. The current YES price reflects the market's collective probability.
- Size your position. If you stake 100 USDC at 50% YES, you'll receive shares that pay $200 if YES resolves true — a 100% gross return. If NO resolves, your shares are worth $0.
- Set risk controls (optional). Stop-loss, take-profit, and limit-order types all supported. Use the trade ticket's slippage box to cap your maximum entry price.
- Wait for resolution. When the event resolves on-chain via the UMA optimistic oracle, the winning side settles to 100¢ automatically and USDC hits your balance within seconds. Withdrawable to any wallet you control.
How active is this market?
$1.6M in lifetime turnover and $22K of resting liquidity puts this market in the top 2% by volume for big tech contracts on PolyGram. Order-book depth is modest — expect a couple of cents of slippage on $1k+ trades.
Last 24 hours alone saw $223 in turnover, consistent with the market's lifetime daily-average pace.
The market has been open for 8 months — long enough that the order book is mature and price is well-anchored to fundamentals.
Higher-volume markets tend to have tighter spreads and faster price discovery — meaning the displayed YES/NO percentages are more likely to reflect the true crowd-implied probability rather than a single trader's directional view.
Key terms
- YES / NO share
- A binary outcome token that pays $1.00 if the underlying claim resolves true (YES) or false (NO), and $0 otherwise. The market price between 0¢ and 100¢ is the implied probability.
- CLOB
- Central limit order book. The matching engine that pairs YES buyers with NO buyers (effectively the same trade). Polymarket's CLOB on Polygon executes trades on-chain via the conditional-tokens framework.
- Liquidity
- USDC capital sitting in resting limit orders inside the order book. Deeper liquidity means smaller slippage on large trades and a tighter bid-ask spread.
- UMA optimistic oracle
- The on-chain dispute system that settles each Polymarket market. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution.
- Slippage
- The difference between the displayed mid-price and your fill price. Affects market orders most; limit orders avoid slippage but may take time to fill.
- Conditional token
- ERC-1155 outcome share issued by Gnosis Conditional Tokens on Polygon. The token type that resolves to $1.00 or $0.00 at settlement.
Frequently asked questions
How does this market resolve?
Resolution is handled by the UMA optimistic oracle on Polygon. A proposer submits the outcome, a 2-hour dispute window opens, and if uncontested the payout is final. Contested outcomes escalate to UMA token holders.
When does this market close?
This prediction market is scheduled to close on 31 December 2026. After the resolving event occurs, settlement typically clears within 24 hours once the UMA optimistic oracle confirms the outcome. All payouts are in USDC on the Polygon network.
How can I trade on "OpenAI IPO Closing Market Cap"?
To trade on this prediction market, create a free PolyGram account at polygram.ink, deposit USDC via Polygon, and place a YES or NO order on the outcome you believe in. You can learn more on our how-it-works page. Your maximum loss is limited to your stake — there is no leverage or margin.
What happens when the market resolves?
When the outcome is determined, winning YES shares pay out $1.00 each in USDC, while losing shares pay $0. Settlement is handled by the UMA optimistic oracle on Polygon — a proposer submits the result, a two-hour dispute window opens, and if uncontested, payouts are distributed automatically. You can withdraw your winnings to any Polygon wallet.
Risk and regulatory note
Prediction-market positions can lose 100% of staked capital. Outcomes are uncertain by definition — historical accuracy of crowd-implied probabilities is high in aggregate but not for any single market. PolyGram does not provide investment advice. Trade only with capital you can afford to lose.
Regulatory status varies by jurisdiction. Germany, the United States, and most EU countries treat Polymarket-style event contracts under one of three frameworks: financial derivative, gambling product, or unregulated novel asset. Consult local counsel before trading.
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