Driven by 401(k) contributions and the increasing popularity of exchange-traded funds, stock sales of major mutual fund companies have significantly outpaced those of more traditional stocks and bonds, according to a report from USA Today.

Lipper's Management Company index, which gauges the success of the nation's largest publicly traded mutual fund company stocks, has surged 15.3%, versus a 3.5% gain for S&P 500, in the last three months.

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