iShares MSCI KLD 400 Social Index Fund (the Fund), formerly iShares FTSE KLD 400 Social Index Fund, seeks to provide investment results that correspond generally to the price and yield performance of the MSCI KLD 400 Social Index (the Index). The Index is a free float-adjusted market capitalization index designed to measure the equity performance of the United States companies. The Index consists of approximately 400 companies identified by MSCI from the universe of companies included in the MSCI USA IMI Index, which consists of the New York Stock Exchange (NYSE) and NASDAQ Stock Market LLC listed United States equities. The Fund's investment advisor is BlackRock Fund Advisors (BFA).