Dow falls 150 points in open after Greece 'no' vote By: CNBC.com News July 06, 2015 at 09:33 AM EDT U.S. stocks opened lower, following declines overseas, as uncertainty over the Greece debt crisis weighed on investor sentiment. Read More >> Related Stocks: Dollar Tree GX Defense Tech ETF Humana Schulman A Inc Sentinelone Inc Cl A Seritage Growth Properties UnitedHealth Group