The Russell 2000 index of smaller companies was down 2.08, or 0.27 percent, to 780.82.
Advancing issues barely outnumbered decliners on the New York Stock Exchange, where consolidated volume came to 1.65 billion shares, compared to 2.32 billion shares at the same point on Thursday.
The Dow Jones industrials ended the week down 102.30, or 0.82 percent, to finish at 12,343.22. The S&P 500 index was down 16.33, or 1.14 percent, to end the week at 1,410.76. The NASDAQ fell 56.02, or 2.28 percent, to finish the week at 2,401.18.
The Russell 2000 index closed the week down 11.89, or 1.50 percent, to end at 780.82.
The Dow Jones Wilshire 5000 Composite Index -- a free-float weighted index that measures 5,000 US based companies -- ended the week at 14,177.66, down 179.22 points from last week. A year ago the index was at 12,700.27.
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