A look at the weighted underlying holdings of the iShares Russell 2000 Index Fund (IWM) shows an impressive 12.6% 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 Life-Time Fitness Inc (LTM), which makes up 0.18% of the iShares Russell 2000 Index Fund (IWM), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.