Dow falls 100 points in open as Greece drama intensifies By: CNBC.com News June 29, 2015 at 09:30 AM EDT U.S. stocks opened sharply lower on Monday, following a decline in global markets, as the Greece debt crisis escalated over the weekend. Read More >> Related Stocks: Integrys Energy Group J B Hunt Transport Sentinelone Inc Cl A Tegna Inc Wisconsin Energy Corp