4% — OpenAI IPO Closing Market Cap: <500B
Polymarket 4% · 1 contracts · $0 volume · low confidence
Updated 2026-06-08 07:01:55 UTC

Why this matters:
This probability represents the odds that OpenAI's initial public offering will close with a valuation below $500 billion. Currently priced at 15%, it reflects market expectations that OpenAI will either go public at a higher valuation or not IPO by end-2026. The main factors influencing this low probability are OpenAI's demonstrated revenue growth and market positioning as a leader in AI, which typically command higher valuations, and the company's ability to raise private capital at substantial valuations. The biggest catalyst is any official IPO filing or announcement from OpenAI leadership, which would provide clarity on timing and valuation expectations. Secondary timing factors include regulatory developments around AI governance and competitive pressures from other AI companies pursuing public markets. The market currently assigns roughly equal weight to scenarios where OpenAI goes public at significantly higher valuations versus scenarios where no IPO occurs before year-end 2026.

Key factors:
- OpenAI raised private funding at $80B valuation in October 2023; subsequent market developments and revenue growth would typically support higher IPO valuations
- 73% market probability assigned to 'No IPO by December 31, 2026' suggests market skepticism about near-term public offering timing
- Comparable valuations: recent SpaceX private rounds and other AI company public offerings provide benchmarks for IPO pricing expectations
- No official IPO filing or concrete timeline has been announced; regulatory clarity on AI companies may accelerate or delay public market entry
- OpenAI's competitive position and revenue trajectory relative to other enterprise software companies historically valued at 2-5x revenue multiples

Contracts:
- OpenAI IPO Closing Market Cap: <500B — 4¢ Polymarket $0 (weight 100%)

---

## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

---

*Last verified: 2026-05-25T05:20:12.405Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "4% per prediction markets (SimpleFunctions, June 2026)"
Canonical: https://simplefunctions.dev/answer/openai-ipo-closing-market-cap-500b
Full data: https://simplefunctions.dev/api/public/query?q=OpenAI%20IPO%20Closing%20Market%20Cap%3A%20%3C500B
Provider: SimpleFunctions — https://simplefunctions.dev