A look at the weighted underlying holdings of the iShares ESG Aware MSCI USA Small-Cap ETF (ESML) shows an impressive 222.6% 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 » Chart Industries Inc (GTLS), which makes up 15.20% of the iShares ESG Aware MSCI USA Small-Cap ETF (ESML), has seen 4 directors and officers purchase shares in the past six months, according to the recent Form 4 data.