OpenAI IPO confidential S-1 progresses — public prospectus potentially arriving late July 2026

What happened

OpenAI's confidential S-1 filing with the SEC (submitted May 22, 2026) is moving toward public debut. Reuters on July 12 signaled the earliest public prospectus could arrive by late July, with a potential IPO debut in September 2026.

Context and impact

OpenAI is the most valuable US startup and an IPO would be a historic moment for the AI sector. A $730B–$1T valuation despite massive losses reflects the market premium for dominant AI positioning. Polymarket assigns a 54% probability to an OpenAI IPO before end of 2026.

Details

• Confidential S-1: filed May 22, 2026
• Target valuation: $730B – $1T
• 2026 loss projection: $14B
• Planned profitability: 2030s
• Polymarket probability: 54% for IPO before end of 2026
• Potential debut: September 2026