iShares Core S&P Total U.S. Stock Market ETF, formerly iShares S&P 1500, is an exchange-traded fund of US stocks. The fund tracks the S&P 1500 index.
In October 2012, it was renamed and its ticker was changed to ITOT from ISI.
Other "all-cap" funds are Vanguard Total Stock Market ETF (NYSE Arca: VTI) and iShares Russell 3000 (NYSE Arca: IWV).
Top ten holdings:
(as of June 2012)