A look at the weighted underlying holdings of the Invesco S&P 500— Equal Weight Utilities ETF (RSPU) shows an impressive 10.1% 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 » Alliant Energy Corp (LNT), which makes up 3.53% of the Invesco S&P 500— Equal Weight Utilities ETF (RSPU), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.