Markets under pressure on GDP, Greece concerns By: CNBC.com News June 01, 2015 at 06:15 AM EDT U.S. stock markets looked set for a flat to slightly lower open on Friday, as investors digested the second read on first quarter growth. Read More >> Related Stocks: Altera Corp Bank of Nova Scotia Big Lots Equinix Inc GameStop Corp Intel Corp Interxion Holding Ord Shs