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Big data: Buy these stocks in December

Traders work on the floor of the New York Stock Exchange.
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Traders work on the floor of the New York Stock Exchange.

A sector of the market could post a year-end rally, if history is any guide.

Based on 30 years worth of data, small-cap stocks show a positive bias toward outperforming in December, according to Kensho, a tool designed to quantify historical market events.

In fact, the trend shows the Russell 2000 index returns, on average, 3.6 percent in the last month of the year, compared with an average gain of 1.9 percent for the S&P 500.

Although December is historically a bullish month for investors , a number of small-cap names seem to have been great bets as the year came to a close.

Here are some of the best stocks to have owned in December.