OpenAI IPO Closing Market Cap

OpenAI IPO Closing Market Cap is a finance prediction market asking traders to forecast OpenAI’s market capitalization at the closing price on its first day of trading. The event centers on whether OpenAI completes an IPO before the deadline, and if no IPO occurs by December 31, 2026, 11:59 PM ET, the market resolves to “No IPO by December 31, 2026.” If an IPO does happen, resolution is based on the company’s official closing price on the first trading day and the corresponding market cap, with bracketed ranges resolved to the higher bracket when the value falls exactly between two ranges. This event matters because OpenAI is one of the most closely watched Big Tech and AI companies, so the outcome is a key signal for market sentiment around the company’s valuation and public listing prospects. Current market probability is about 1.65%, suggesting traders assign relatively low odds to a near-term outcome. The forecast is active from September 23, 2025 through December 31, 2026, making it a long-dated event prediction tied to OpenAI, IPOs, and broader tech-finance expectations.