A look at the weighted underlying holdings of the First Trust Materials AlphaDEX Fund (FXZ) shows an impressive 11.2% of holdings on a weighted basis have experienced insider buying within the past six months. Start slideshow:10 ETFs With Stocks That Insiders Are Buying » Cleveland-Cliffs Inc (CLF), which makes up 2.80% of the First Trust Materials AlphaDEX Fund (FXZ), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.