Last month was a good one for the broad market, but a great one for select stocks. Whereas the S 500 advanced another 3.1% in July, a handful of the S 500's constituents dished out double-digit gains.

Past performance is no guarantee of future results, of course. In fact, the bigger the gain, the greater the potential profit-taking. The question is, should this worry apply to the S 500's hottest stocks in July?

Last month's biggest winners among the S 500's names are Zions Bancorp (NASDAQ: ZION), (NYSE: KEY), and Newell Brands (NASDAQ: NWL), with gains of 42.4%, 33.2%, and 28.3%, respectively. An honorable mention goes to Comerica stock, which was close to cracking the top three with its July gain if 27.4%.

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Source Fool.com