A look at the weighted underlying holdings of the Invesco KBW Regional Banking ETF (KBWR) shows an impressive 16.1% 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 » Columbia Banking System Inc (COLB), which makes up 1.58% of the Invesco KBW Regional Banking ETF (KBWR), has seen 12 directors and officers purchase shares in the past six months, according to the recent Form 4 data.