U.S. stocks fell 1 percent on Wednesday as renewed concerns about the euro zones prompted investors to sell equities after last week's hefty year-end rally, wiping out the S&P 500's gains for the year.

Based on the latest available data, the Dow Jones industrial average <.DJI> was down 139.94 points, or 1.14 percent, to end unofficially at 12,151.41. The Standard & Poor's 500 Index <.SPX> was down 15.79 points, or 1.25 percent, to finish unofficially at 1,249.64. The Nasdaq Composite Index <.IXIC> was down 35.22 points, or 1.34 percent, to close unofficially at 2,589.98.

(Reporting By Caroline Valetkevitch; Editing by Jan Paschal)