A look at the weighted underlying holdings of the Vanguard Real Estate ETF (VNQ) shows an impressive 10.4% 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 » Healthcare Trust Of America Inc (HTA), which makes up 0.52% of the Vanguard Real Estate ETF (VNQ), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.