Wilshire Total Market Index

The Wilshire 5000 Total Market Index is a market-cap weighted index of the market value of all US stocks. Because of this, the Wilshire 5000 is often used as a benchmark for the entire US stock market. Even though it doesn’t contain all of the stocks in the entire market, it is a more accurate representation of “the markets” than any other index. The Wilshire 4500, is a capitalization-weighted index of all stocks actively traded in the United States with the exception of the stocks included in the S&P 500 index.
CRSP is another total market index worth checking out, as it is gaining popularity in the ETF world.