A look at the weighted underlying holdings of the Vanguard Russell 2000 ETF (VTWO) 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 » Terreno Realty Corp (TRNO), which makes up 0.19% of the Vanguard Russell 2000 ETF (VTWO), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.