SpaceX IPO Public S-1 Filing Window Opens May 15 — $75B Nasdaq Debut Targeting June 2026 at $1.75T+ Valuation

May 15, 2026, marks the opening of the earliest possible window for SpaceX to publicly file its S-1 registration statement with the U.S. Securities and Exchange Commission (SEC) — the public prospectus for its planned Nasdaq IPO. Under SEC rules, the company must publish its S-1 at least 15 calendar days before launching the formal investor roadshow, which is reportedly targeting the week of June 8, 2026. SpaceX filed a confidential draft S-1 with the SEC on approximately April 1, 2026 (internally codenamed 'Project Apex'), backed by 21 underwriting banks led by Morgan Stanley and Goldman Sachs. The company is targeting a raise of approximately $75 billion — which would be the largest IPO in U.S. history by a significant margin, surpassing Saudi Aramco's 2019 record of $29.4 billion. Target valuation has been reported between $1.75 trillion and $2+ trillion, depending on the source. SpaceX's planned 30% retail allocation (approximately 3x the industry norm) is designed to broaden its shareholder base ahead of anticipated inclusion in the S&P 500 index following its debut. Kalshi prediction markets as of early May 2026 placed the probability of an IPO announcement by July 1 at 82% and by August 1 at 85%. The IPO window (May 15–22 for public S-1) aligns with the management roadshow week of June 8 and a June 18–30 pricing and debut target on Nasdaq. Bloomberg has reported that SpaceX's 2026 revenue — spanning Starlink (~$15.9–24B projected), government launch contracts, and commercial payloads — gives it a fundamentals base for the valuation, though market analysts have noted the P/S multiple at $1.75T+ is in high-double-digits territory unprecedented for a launch company.