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Small caps are outperforming the S&P 500 this year, and 'Shark Tank's' Kevin O'Leary is betting on more gains to come

Keris Lahiff

The iShares Russell 2000 ETF (IWM) IWM , which tracks the small cap-focused Russell, has rallied more than 11 percent in 2019, capping off Friday with its third up week in a row. Kevin O'Leary , co-founder of O'Leary Funds and co-host of "Shark Tank," told CNBC recently that several