OpenAI $1t+ IPO before 2027?

Prediction markets put the probability at 64%: OpenAI $1t+ IPO before 2027. Currently, markets are divided (64% YES, 36% NO). Polymarket launches private company trading so investors can speculate on Anthropic, OpenAI.

What’s Happening

OpenAI is preparing to confidentially file for an initial public offering as soon as this week, targeting a September 2026 public debut at a valuation that could exceed $1 trillion, according to multiple reports. The ChatGPT maker, last valued at $852 billion in private secondary markets, is working with Goldman Sachs and Morgan Stanley on the filing. The move follows OpenAI’s legal victory over Elon Musk’s existential court challenge on May 18, 2026, removing a key regulatory overhang. The company’s confidential submission to the U.S. Securities and Exchange Commission would trigger a 21-day review period, setting the stage for a potential roadshow by late August. [OpenTools, May 21]

The OpenAI $1t+ IPO timeline pits the company directly against Elon Musk’s SpaceX and rival Anthropic in the race to public markets, with both competitors also reportedly preparing offerings. Polymarket launched private company trading contracts on May 19, 2026, allowing investors to speculate on OpenAI’s valuation milestones and IPO timing. The prediction market currently shows a 64% probability that OpenAI will achieve a $1 trillion+ valuation before January 1, 2027, reflecting heightened investor confidence after the legal resolution. Historically, AI companies filing IPOs within weeks of major litigation outcomes have seen first-day pops averaging 18-25%, based on data from the 2021-2023 tech IPO cycle. [CNBC, May 19]

Key indicators for the OpenAI $1t+ IPO include the company’s revenue trajectory, which reached $3.7 billion in annualized run-rate as of Q1 2026, and its gross margins of 62%, according to filings cited by Axios. The IPO’s success hinges on broader market conditions: the 10-year Treasury yield currently sits at 4.32%, while the NASDAQ-100 has gained 14% year-to-date. If OpenAI files confidentially by May 25, 2026, the SEC’s review process would conclude by mid-June, allowing the company to price shares in late August. The offering would be the largest tech IPO since Arm Holdings’ $5.2 billion debut in September 2023, and the first AI-native company to target a trillion-dollar valuation at listing. [Axios, May 20]

Traded on Polymarket — $274K Volume

Polymarket prices this at 62c YES with $274K in volume. Moderate liquidity — use limit orders for positions above $1K to avoid moving the price.