Four largest ETFs hold about $3.5 trillion across U.S. equity markets
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The Vanguard S&P 500 ETF (VOO), iShares Core S&P 500 ETF (IVV), State Street SPDR S&P 500 ETF (SPY) and Vanguard Total Stock Market ETF (VTI) are the four largest exchange‑traded funds in the world and together manage roughly $3.5 trillion of investor money.
Three of the funds track the same S&P 500 index but differ in fees, portfolio composition and liquidity, while VTI covers the entire investable U.S. stock market of about 3,500 stocks and overlaps the S&P 500 by roughly 88%, leaving about 12% in mid‑ and small‑cap stocks.