Wall Street shaky as Greek debt talks collapse By: CNBC.com News February 17, 2015 at 05:15 AM EST U.S. stock index futures signaled a lower open on Tuesday, following Europe, after talks between Greece and its euro zone partners broke down. Read More >> Related Stocks: Agilent Technologies American Campus Communities Inc Analog Devices CF Industries Holdings Devon Energy FirstEnergy Corp Fossil Group Genuine Parts Goodyear Tire & Rub MGM Resorts International Medtronic Sentinelone Inc Cl A