OpenAI IPO Closing Market Cap

Traders currently price "1.5T+" at 35% for "OpenAI IPO Closing Market Cap". Over the past 24 hours that probability moved up 2.3 points. Full distribution: 1.5T+ 35%, 1.25T–1.5T 23%, 1T–1.25T 21%, 750B–1T 11%. The market has traded $88K in total volume and resolves Dec 31, 2027. OpenAI’s confidential S-1 filing and $852 billion March 2026 private valuation anchor trader expectations for an eventual IPO, with the market-implied odds showing a fragmented distribution across closing market caps that reflects timing uncertainty and execution risk. Strong revenue momentum at roughly $2 billion monthly, driven by enterprise API adoption, supports the leading 1.5T-plus outcome at 34.9 percent implied probability, while persistent operating losses and competitive pressure from rivals temper enthusiasm for outsized multiples. The 9.5 percent chance of no IPO by December 31, 2027, incorporates delays signaled in mid-2026 reporting, and the wide spread across $750 billion to $1.5 trillion bands highlights sensitivity to upcoming catalysts such as further funding rounds, regulatory filings, and fourth-quarter 2026 or 2027 listing windows. Aggregated real-money positioning underscores the wisdom of crowds in pricing these financial variables.

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