Greece rejected a bailout offer to send the markets down to a lower open with the Dow falling 65 points to 17,664. Nasdaq lost 13 points to 4,995.

On the upside

The New York Post reported that Weight Watchers (NYSE: WTW) may be acquired by a hedge fund.

Enzon Pharmaceuticals (Nasdaq: ENZN) declared a special cash dividend of 50 cents per common share payable on August 12, 2015 to shareholders of record July 21, 2015.
 
Aetna (NYSE: AET) will acquire Humana (NYSE: HUM) in a cash and stock deal valued at approximately $37 billion including the assumption of debt.

On the downside

Horsehead Holdings (Nasdaq: ZINC) reported that June production slowed at its Mooresboro, North Carolina zinc production facility.

AirMedia Group (Nasdaq: AMCN) hired Duff & Phelps Securities and Kirkland & Ellis to advise the company on an offer to take the company private.

Shares of National Bank of Greece (NYSE: NBG) fell after Greece overwhelming voted against a proposed bailout package and Finance Minister Yanis Varoufakis resigned.
 
In the broad market, declining issues outpaced advancers by a margin of 3 to 1 on the NYSE and by 5 to 2 on Nasdaq. The broader S&P 500 lost 6 points to 2070. Bitcoin added $4 to $273.