A look at the weighted underlying holdings of the WilderHill Progressive Energy Portfolio (PUW) shows an impressive 10.2% 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 Owens Corning (OC), which makes up 2.06% of the WilderHill Progressive Energy Portfolio (PUW), has seen 3 directors and officers purchase shares in the past six months, according to the recent Form 4 data.