U.S. stocks are opening higher, following sharp gains in Europe as world leaders clinched a cease-fire deal for Ukraine.

Whole Foods jumped 4 percent after the high-end grocery chain reported better earnings than analysts were expecting.

Orbitz soared 21 percent after rival online travel site Expedia said it would buy the company for $1.3 billion. Expedia jumped 12 percent.

The Dow Jones industrial average rose 36 points, 0.2 percent, to 17,887 as of 9:35 a.m. Eastern time Thursday.

The Standard & Poor's 500 gained nine points, or 0.4 percent, to 2,077. The Nasdaq rose 28 points, or 0.6 percent, to 4,829.

European indexes rose after the Ukraine cease-fire agreement was announced. Investors were also hopeful that Greece would be able to reach a deal on its debts with its creditors.