OpenAI Files Confidential S-1, Targets September IPO

Summary

OpenAI filed a confidential S-1 with the SEC on or around May 22, 2026, targeting a September 2026 public listing. Goldman Sachs and Morgan Stanley are leading. Expected valuation range: $852B-$1T. CEO Altman pushing for faster timeline; CFO Friar favoring deliberate approach. The confidential filing means financials won’t be public until ~15 days before roadshow. This would be the largest technology IPO in history.

Implications

• IPO race: OpenAI now targets September, ahead of Anthropic’s October target. Prediction markets give OpenAI 83% chance of confirming IPO before Anthropic. First-mover in public markets sets the valuation benchmark.
• Margin disclosure incoming: The -122% non-GAAP operating margin from Q1 will eventually appear in public filings. The confidential filing delays but doesn’t prevent this disclosure.
• Competitive context: Filed same week as Anthropic’s Karpathy hire and Stainless acquisition. Both companies staging for public markets simultaneously.
• Feeds threads: token economics competition (margin disclosure will be the definitive data point), Anthropic distribution machine (competitive IPO timing).