GMO warns US equity returns could be pressured for years as stock supply grows about 5% annually
AI Market Summary
GMO warns US equity supply could rise ~5% annually due to mega-IPOs (e.g., OpenAI/Anthropic), SpaceX secondary sales, and broader issuance—an abrupt shift from the historical net shrink in equity supply. With markets dominated by benchmark-constrained passive flows and investors already heavily allocated to equities, incremental supply may force portfolio rebalancing and pressure broad index returns, particularly in crowded mega-cap/AI exposures.
Impact level
● High
Affected assets
NCSISP5002USD/USDT+0.55%
AI Insight · NCSISP5002USD/USDTAI Insight
▼ Bearish
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GMO said the supply of publicly listed US stocks is growing at about 5% a year, with SpaceX stock sales accounting for roughly 1% of the market’s total value. The firm estimated that OpenAI and Anthropic, which are expected to list in the near future, together represent about 5% of the market’s investable capitalization. That pace contrasts with a historical pattern of equity supply shrinking by 1% per year, and could dampen US stock returns by about 20% over the next year and a half, GMO wrote in a report.
