The S&P posted its biggest percentage decline so far in 2012 on Friday after an about-face on Greece's long-awaited debt deal ended a five-week streak of gains for equities.

Based on the latest available data, the Dow Jones industrial average <.DJI> was down 89.31 points, or 0.69 percent, at 12,801.15. The Standard & Poor's 500 Index <.SPX> was down 9.33 points, or 0.69 percent, at 1,342.62. The Nasdaq Composite Index <.IXIC> was down 23.35 points, or 0.80 percent, at 2,903.88.

For the week, the Dow was down 0.5 percent, S&P was down 0.2 percent and the Nasdaq was down 0.06 percent.

(Reporting By Caroline Valetkevitch; Editing by Kenneth Barry)

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