A trader works on the floor of the New York Stock Exchange on the morning of October 30, 2015 in New York City. Secretary of Homeland Security Jeh Johnson rang the opening bell.
Andrew Burton—Getty Images

U.S. stocks registered their strongest monthly performance in four years on Friday, even as they finished lower on the day amid a mixed bag of earnings reports.

Based on the latest available data, the Dow Jones industrial average fell 91.46 points, or 0.52%, to 17,664.34, the S&P 500 lost 9.97 points, or 0.48%, to 2,079.44 and the Nasdaq Composite dropped 20.53 points, or 0.4 %, to 5,053.75.

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