OpenAI IPO closing market cap above ___ ?

Resolution Criteria

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.

Prediction markets are pricing OpenAI's IPO closing market capitalisation across a range of thresholds, with the heaviest volume concentrated on outcomes above $800 billion and $1 trillion on the first day of trading. Support thins progressively at higher thresholds, with $1.6 trillion the least heavily backed. The market resolves to 'Yes' or 'No' for each threshold based on the official first-day closing market cap, with a hard deadline of 31 December 2027.

Market structure

Five separate Yes/No markets cover thresholds of $800 billion, $1 trillion, $1.2 trillion, $1.4 trillion, and $1.6 trillion. Volume is heavily concentrated on the lower thresholds, tapering as values increase — forming a staircase structure consistent with correlated outcomes. Each resolves against the official closing market cap on OpenAI's first trading day. If no IPO occurs by 31 December 2027, all markets resolve 'No'. The primary exchange's official listing page is the designated resolution source.

Background

OpenAI, the San Francisco-based artificial intelligence company behind ChatGPT and the GPT series of large language models, has grown into one of the most closely watched private technology companies in the world. Having raised capital at valuations reaching into the hundreds of billions of dollars in recent private funding rounds, OpenAI has been the subject of sustained speculation about a potential public listing. The company's governance structure — historically a capped-profit model nested within a non-profit — has added complexity to any IPO pathway, though restructuring discussions have been reported. An OpenAI listing would rank among the largest technology IPOs in history, drawing comparisons to landmark listings by Meta, Alibaba, and Alphabet.

Key factors

The timing and scale of an OpenAI IPO depend on several structural variables. First, the company must complete any outstanding corporate restructuring — converting or modifying its non-profit governance arrangement — before a public listing becomes straightforward. Regulatory scrutiny, including any antitrust or AI-specific oversight in the United States or European Union, could affect both timeline and investor appetite. Broader equity market conditions on the date of listing will influence first-day closing price independently of OpenAI's private valuation. The gap between private funding-round valuations and public market pricing at IPO is a known variable; technology IPOs have historically priced both above and below prior private marks. Lock-up structures, float size, and underwriter pricing decisions all affect the closing market cap figure on day one. A circuit breaker or trading interruption on the first day triggers a specific fallback mechanic under the resolution criteria.

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