PolymarketAI / TechDevelopingUpdated 9m ago

Will OpenAI have the highest IPO Market Cap 2026?

As of Nov 1, 2026, 7:29 PM ET, Polymarket priced this market at 0.4% (little changed over 24 hours). It had $65.6K traded in the past 24 hours, $81.5K of order-book liquidity and a bid-ask spread of 0.1 pts. probcast.co rates the support behind this price as strong.

Market probability
0.4%
Little changed over 24 hours

Deep, easy-to-trade market — though most recent trading came from one account.

Price historyPolymarket

Source: Polymarket price history

How credible was the move?

Methodology →

Move validity

Strong

Consensus stability

Stable

Contract clarity

High

Can you trust this price?

Two different questions: how hard the price is to move, and whose trading set it.

Market capacity

How hard is it to move this price?

DeepTight spread

Order-book liquidity

$81.5K

Bid-ask spread

0.1 pts

24h volume

$65.6K

Total volume

$678.3K

It would take roughly $218.2 of buying to move the price up by ~5 pts.

Lots of money on the book and a tight spread — a single ordinary order can't move this price much.

Who's trading

Whose opinion is this price?

One account dominates
84%of the traded money came from the single largest account

Accounts

58

Trades

200

over 9 days

Largest order

$136.6

$414.9 traded across these 200 trades (last 9 days).

One account did most of the recent trading — the price reflects that account's view more than a crowd's.

Recent trade activity$414.9 traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

This market will resolve to the company that achieves the highest market capitalization in U.S. dollars based on the official closing price on its first trading day in 2026.

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

This market will resolve to the company that achieves the highest market capitalization in U.S. dollars based on the official closing price on its first trading day in 2026. This market will resolve to a company that completes an Initial Public Offering (IPO) between January 1 and December 31, 2026, 11:59 PM ET. Market capitalization is defined as the total number of outstanding shares multiplied by the closing share price on the first trading day. If two or more companies have exactly equal highest closing market capitalizations, this market will resolve to the company whose listed name comes first alphabetically. 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 case the respective company's primary exchange’s official listing page does not report in U.S. dollars, it will be converted to U.S. dollars using the U.S. Federal Reserve Board’s H.10 foreign exchange reference rate for the relevant currency pair on the company’s first trading day (https://www.federalreserve.gov/releases/h10/). If no such rate is available for the relevant trading day, the most recent previously published rate will be used. If the relevant currency is not listed, another credible exchange rate source will be used. A listed company may resolve to "No" as soon as it becomes unable to complete an IPO, including due to acquisition, merger, or absorption by an entity that is already publicly traded. 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 for purposes of this market.

Resolution source: federalreserve.gov

What could move this market next?

  • The market's deadline arrivesDecember 30, 2026 at 7:00 PM ET

    The contract must resolve based on what has happened by this date.

  • Confirmation at the resolution source (federalreserve.gov)

    The rules name this source as the basis for settlement.

Derived from the contract's own mechanics as of Nov 1, 7:38 PM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: high · expected error ±10 pts.

Quote-drivenLegacy movement classifier: watch

What's happening

medium classifier confidence
Quote-driven

A tight, deep, quote-driven book with little executed flow. The price is stable but reflects resting quotes more than active trading.

  • Tight spread on a liquid, calm market

The latest price is a usable but caveated read — weigh it with the market state.

More details — reliability score, dynamics, durability
Reliability score
54Medium
Where the price path tends to go next455 observed
  • Stable consensus97%
  • Trend continuation1%
  • Choppy / mean-reverting1%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~48h
PredictabilityStable

Secondary read: leaning toward Trading normally.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Change (pts)1H-0.16H-0.324H-0.37D-0.3

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