First Trust Mid Cap Growth AlphaDEX Fund (First Trust Mid Cap Growth Alph) ETF

The fund will normally invest at least 90% of its net assets (including investment borrowings) in the securities that comprise the index. The index is designed to select growth stocks from the NASDAQ US 600 Mid Cap Index TM (the "base index") that may generate positive alpha, or risk-adjusted returns, relative to traditional indices through the use of the AlphaDEX® selection methodology.