      Tomasz Tunguz (Theory Ventures) · 2026-02-23
      · 101d
    

SpaceX, OpenAI & Anthropic IPOs: Market Liquidity Crisis and S&P 500 Disruption

Three mega-cap IPOs (SpaceX $1.5T, OpenAI $1T, Anthropic $380B) totaling $2.9T will require $432-576B in public float, exceeding a decade of US IPO volume. With initial floats of only 3-8%, these companies cannot qualify for S&P 500 inclusion, but when they do, passive funds managing $20T must rebalance, triggering forced selling of existing mega-cap holdings and potential market instability.

12 metrics· Cited 0× in the knowledge base ·Open source ↗

Metrics in this report

Anthropic Valuation

0.38$T

current

latest funding round

Apple Market Cap

3.4$T

current rank 1

largest US company by market cap

Combined Three-Company Market Cap

2.9$T

sum

projected total at IPO

Expected Initial Float

3-8%

projected

mega-cap IPO debuts

Meta Market Cap

1.6$T

current rank 6

potential displacement target

OpenAI Target Market Cap

1.0$T

targeting

IPO valuation

Passive Fund Assets Under Management

20$T

affected

must rebalance upon S&P 500 inclusion

Required Float at 15%

432-576$B

range

capital needed from public markets

S&P 500 Public Float Requirement

50%

minimum threshold

index inclusion eligibility

SpaceX Target Market Cap

1.5$T

targeting

IPO valuation

Typical IPO Float Range

15-25%

historical median

standard public offerings

US IPO Market Volume 2016-2025

469$B

total

decade of IPO proceeds