U.S. stocks edged up at the open on Monday after euro zone finance ministers approved a massive emergency aid plan for debt-stricken Greece, easing sovereign debt concerns.

But the positive sentiment was muted after a German government spokesman raised a potential hitch to the Greece deal by saying European leaders would have to agree at a special summit to activate the aid mechanism.

The Dow Jones industrial average <.DJI> rose 17.23 points, or 0.16 percent, to 11,014.58. The Standard & Poor's 500 Index <.SPX> gained 2.32 points, or 0.19 percent, to 1,196.69. The Nasdaq Composite Index <.IXIC> added 3.67 points, or 0.15 percent, to 2,457.72.

(Editing by Jeffrey Benkoe)