A look at the weighted underlying holdings of the SPDR S&P International Small Cap ETF (GWX) shows an impressive 29.7% 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 » Republic Services Inc (RSG), which makes up 29.20% of the SPDR S&P International Small Cap ETF (GWX), has seen 2 directors and officers purchase shares in the past six months, according to the recent Form 4 data.