OpenAI Confidentially Files for IPO. Shares Likely Set for Autumn Trading Debut.

A bit late to the party? SpaceX drops shares this Friday while Anthropic is expected to follow in a few weeks.

🚀 IPO Season Just Got Bigger

• OpenAI officially joined Wall Street’s IPO parade, announcing Monday that it has confidentially submitted a draft S-1 filing to regulators. That’s the paperwork companies file before going public, though investors won’t get to see the details just yet.
• The ChatGPT creator acknowledged the filing in a characteristically casual fashion, in a blog post, saying it expects news of the submission to leak anyway. Translation: the secret was becoming an open secret, so they decided to get ahead of it.
• Timing remains flexible. OpenAI said a public debut may still be “a while away,” though rumors suggest shares could begin trading as early as September if preparations stay on track.

🤖 AI Giants Race to Market

• OpenAI’s move comes just one week after rival Anthropic disclosed its own confidential IPO filing. The two AI heavyweights are now racing toward public markets while battling for customers, talent, and model supremacy.
• Investors have been expecting this moment. Reports surfaced in May that OpenAI was already working with investment banks on a draft prospectus, making Monday’s announcement more confirmation than surprise.
• The AI listing wave is arriving fast. SpaceX is expected to debut this Friday at a valuation of $1.75 trillion, while Anthropic could follow within weeks. Suddenly, the IPO calendar is looking like a blockbuster movie list.

🍿 Liquidity and Valuation Watch

• OpenAI also plans a tender offer, a transaction allowing employees to sell some of their private shares before the IPO. It’s a common way for fast-growing startups to provide liquidity without immediately heading to public markets.
• The company’s latest funding round valued it at roughly $852 billion post-money. That figure could serve as a starting point for investors trying to estimate where a future public valuation might land.
• One thing is becoming clear: 2026 is shaping up as the year of mega-IPOs. Between OpenAI, Anthropic and SpaceX, Wall Street is preparing for the largest and most closely watched listings in market history.