First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund (the Fund) seeks investment results, which correspond to the price and yield (before the Fund's fees and expenses) of an equity index called the NASDAQ OMX Clean Edge Smart Grid Infrastructure Index (the Index). The Fund focuses to invest at least 90% of its net assets in common stocks, which comprises the Index or in depositary receipts, which may include American depositary receipts (ADRs), global depositary receipts (GDRs), European depositary receipts (EDRs) or other depositary receipts (collectively Depositary Receipts) representing securities in the Index. The Index is designed to act as a transparent and liquid benchmark for the grid and electric energy infrastructure sector. First Trust Advisors L.P. acts as an investment advisor of the Fund.