Stocks moved slightly lower in midday Friday trading as investors returned from the Christmas holiday. Trading is expected to be light.

The S&P 500 index was down 0.1% as of 12:15 p.m. ET, the Dow Jones Industrial Average was down 0.2%, and the Nasdaq composite was down less than 0.1%.

Institutional investors are largely closed out of their positions for the year. The S&P 500 has climbed........

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