Stocks ended lower in thin trading Monday, with the S&P and the Nasdaq posting a loss for the month of April, following a handful of mixed economic reports in addition to news that Spain slipped into a recession.

Still, the Dow managed to squeeze out a small gain for the month, logging its seventh-consecutive monthly win. The S&P 500 and Nasdaq declined 0.75 percent and 1.46 percent for the month, respectively.

The Dow Jones Industrial Average slid 14.68 points, or 0.11 percent, to close at 13,213.63, brought down by BofA and Caterpillar .

The S&P 500 declined 5.45 points, or 0.39 percent, to end at 1,397.91. The Nasdaq slumped 22.84 points, or 0.74 percent, to finish at at 3,046.36.

The CBOE Volatility Index, widely considered the best gauge of fear in the market, ended above 17.

Most key S&P sectors finished in negative territory, led by industrials and techs.

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