SPDR S&P 400 Mid Cap Growth ETF -- Insider Buying Index Registering 317740.2%

A look at the weighted underlying holdings of the SPDR S&P 400 Mid Cap Growth ETF (MDYG) shows an impressive 317740.2% 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 Bioverativ Inc (BIVV), which makes up 33579.00% of the SPDR S&P 400 Mid Cap Growth ETF (MDYG), has seen 3 directors and officers purchase shares in the past six months, according to the recent Form 4 data.