OpenAI, Anthropic, and SpaceX IPOs Could Add $4 Trillion to US Market
The simultaneous IPOs of three AI giants would be the largest stock market debut in history, testing whether even the $79 trillion US market can absorb them without years of disruption.
Key Facts
- SpaceX filed for an IPO in May 2026, aiming to raise $75 billion at a $1.75 trillion valuation.
- Anthropic submitted a confidential draft registration for an IPO on June 1, 2026, with its most recent funding round valuing the company at $965 billion.
- The three IPOs could collectively raise over $200 billion and add up to $4 trillion in market capitalization.
- The largest IPO in history, Saudi Aramco in 2019, raised $29 billion, compared to the projected $75 billion from SpaceX alone.
- Interactive Brokers chief strategist Steve Sosnick warned that index provider decisions could force tracker funds to buy shares days after issuance.
Reporting from 1 source: GIGAZINE.
SpaceX, Anthropic, and OpenAI are all pursuing initial public offerings that could collectively raise over $200 billion and add up to $4 trillion in market capitalization. SpaceX filed in May 2026 for what is projected to be the largest IPO in history. Anthropic filed a draft registration on June 1. OpenAI is expected to file soon. The Economist and Interactive Brokers' chief strategist warn of potential disruption from the unprecedented scale.
SpaceX filed a registration statement for an IPO with the SEC in mid-May 2026, aiming to raise approximately $75 billion at a company valuation of around $1.75 trillion. Anthropic submitted a confidential draft registration on June 1, with the number of shares and price still undecided; its most recent funding round valued the company at $965 billion. OpenAI is expected to file its own IPO registration soon.
Combined, the three companies could raise just over $200 billion and add up to $4 trillion to US market capitalization. For comparison, the largest IPO in history, Saudi Aramco in 2019, raised $29 billion. The total market capitalization of the Russell 3000 index is $79 trillion, and the S&P 500 is $69 trillion.
Steve Sosnick, chief strategist at Interactive Brokers, warned that if index providers prioritize including these companies in benchmarks, tracker funds managing trillions of dollars would scramble to buy new shares days after issuance. The Economist noted that while the US stock market is large enough to absorb them, some disruption in the following years should be expected.
Synthesized by Yomimono from the 1 cited source below, including Japanese-language reporting where cited, then editorially reviewed before publishing.