Many funds track U.S. stock market indexes; for example, Vanguard Total Stock Market ETF () tracks the CRSP U.S. Total Market Index, and ETFs that track the S&P 500 Index are issued by The Vanguard Group (), iShares (), and State Street Corporation (). Other funds track international stock indexes; for example, Vanguard Total International Stock Index () tracks the MSCI All Country World ex USA Investable Market Index, while the iShares MSCI EAFE Index () tracks the MSCI EAFE Index, both invest solely in companies that are not based in the United States. Many smaller ETFs use unknown, untested indices.