AI Company Public Market Access: S&P 500 Rejects SpaceX Fast-Track, Closing Path for OpenAI and Anthropic

Three of the highest-valued private companies in the world — SpaceX (~$1.75T), Anthropic ($965B), and OpenAI ($852B) — are converging on public markets in mid-2026, but S&P Dow Jones Indices ruled on June 4 that it will not waive its profitability requirement or shorten its seasoning window for newly listed companies. [1][2] Anthropic filed a confidential S-1 with the SEC on June 1, reporting annualized revenues tracking toward $45B and a post-money valuation of $965B from its Series H. [6] OpenAI is reportedly preparing its own confidential filing with Goldman Sachs and Morgan Stanley, targeting September 2026. [7][12] SpaceX, whose IPO is planned around June 12, will not receive accelerated S&P 500 entry — and the same standard applies to Anthropic and OpenAI once they list. [1]

S&P 500 membership automatically directs purchases from roughly $30 trillion in passive index funds, making accelerated entry worth billions in guaranteed post-IPO buying. [13] By rejecting rule changes, S&P Dow Jones protected that passive-fund capital from being allocated to companies without demonstrated GAAP profitability — a decision that directly limits how quickly SpaceX, Anthropic, and OpenAI can access the largest source of automatic equity demand after listing, and sets the terms under which public investors will be exposed to these companies.

S&P Dow Jones Indices announced on June 4, 2026 that it would not change its S&P 500 eligibility rules, rejecting proposals that would have waived the profitability requirement and shortened the seasoning window for newly listed companies. [1][2] The proposals had drawn public criticism because SpaceX — preparing an IPO at roughly $1.75 trillion — does not meet the existing S&P 500 requirement of positive GAAP earnings in the most recent quarter and cumulatively over the prior four quarters. [3][4] The rejection eliminates the possibility that SpaceX could join the index immediately upon listing, and it closes an analogous fast-track for OpenAI and Anthropic once they complete their own offerings. [1] The S&P decision stands in contrast to reported changes at other index providers: Nasdaq reportedly shortened its seasoning window to 15 days, and Russell/FTSE to five days. [5]

Anthropic made the first formal move toward public markets among the leading AI companies. On June 1, the company announced it had confidentially submitted a draft S-1 to the SEC under Rule 135 of the Securities Act. [6] Anthropic disclosed that its most recent funding round — a $65 billion Series H led by Altimeter Capital, Dragoneer, Greenoaks, and Sequoia Capital — valued the company at $965 billion post-money, making it the most valuable private AI company ahead of OpenAI's reported $852 billion. [6] Annualized revenues are tracking toward $45 billion. No pricing or share count has been set; a public offering can proceed only after SEC review is complete and market conditions permit. [6]

OpenAI is reportedly preparing its own confidential filing with Goldman Sachs and Morgan Stanley, targeting September 2026. [7] Sam Altman has said publicly that OpenAI is not accelerating its timeline in response to Anthropic's S-1 submission. [8] A contrarian view circulating among some market observers holds that IPO filing order is irrelevant in a major technology wave — that OpenAI's roughly $122 billion raised privately already makes any public offering a secondary financing event, not a competitive milestone. [9]

SpaceX's IPO is expected around June 12. SpaceX's S-1 reportedly disclosed a $1.25 billion per month compute arrangement with Anthropic, a detail that, if accurate, bears on how Anthropic accounts for a significant portion of its infrastructure costs. [10] None of the three companies currently meets the S&P 500's GAAP profitability standard, meaning all will need to demonstrate sustained earnings before qualifying for the index — a process that under current rules takes at least 12 months post-listing. [1][11]