U.S. stocks opened slightly lower Friday but the main indexes were on track to end the holiday-shortened week with modest weekly gains. The S&P 500 opened 6 points, or 0.3% lower at 1,945. The Dow Jones Industrial Average slipped 61 points, or 0.4%, to 16,273. The Nasdaq Composite began the day down 24 points, or 0.5% at 4,773.
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