Last month was a good one for the broad market. The S 500's sizable 6.5% gain in June was the best month for stocks since October, capping off an incredible first six months of the year. It wasn't a winner for every ticker, though. A handful of familiar stocks ended June surprisingly in the red.

Veteran investors look at these setbacks and see the potential for some buying opportunities. But before you take the plunge simply because these names were discounted, take a closer look at what really went wrong, why, and what lies ahead.

Last month's biggest losers among the S 500's constituents are Humana (NYSE: HUM), EPAM Systems (NYSE: EPAM), and Dollar General (NYSE: DG), down 10.9%, 12.5%, and 15.6%, respectively.

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Source Fool.com