U.S. stocks ended little changed in a low-volume session on Monday after a downgrade of Greece's debt took the wind out of the sails of the market's rally.

* The Dow Jones industrial average <.DJI> slipped 20.18 points, or 0.20 percent, to end unofficially at10,190.89. The Standard & Poor's 500 Index <.SPX> was off 1.94 points, or 0.18 percent, to finish unofficially at 1,089.66. The Nasdaq Composite Index <.IXIC> inched up 0.36 of a point, or 0.02 percent, to close unofficially at 2,243.96.

(Reporting by Leah Schnurr; Editing by Jan Paschal)