The investment seeks to track the investment results of the MSCI KLD 400 Social Index composed of U.S. companies that have positive environmental, social and governance characteristics. The fund generally invests at least 90% of its assets in securities of the underlying index and in depositary receipts representing securities of the underlying index. The underlying index is a free float-adjusted market capitalization index designed to target U.S. companies that have positive environmental, social and governance (ESG) characteristics.