His firm may sponsor only three small exchange-traded funds right now, but if Sean O'Hara, president of RevenueShares Investor Services of Paoli, Pa., has his druthers, there'll be revenue-weighted ETFs in every investor's portfolio someday. With that in mind, the firm will be offering 10 additional sector ETFs within weeks, with more to come later this year.

RevenueShares is the first ETF sponsor to launch so-called fundamental ETFs that exclusively look to companies' top-line revenue figures.

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