A look at the weighted underlying holdings of the Invesco Wilshire Micro-Cap ETF (WMCR) shows an impressive 16.5% 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 Boston Omaha Corp (BOMN), which makes up 0.41% of the Invesco Wilshire Micro-Cap ETF (WMCR), has seen 5 directors and officers purchase shares in the past six months, according to the recent Form 4 data.