The markets extended its losses during the midday with the Dow dropping 60 points to 15,597. Nasdaq lost 6 points to 3683.

On the upside

North South Holdings, which will be acquired by Spherix (Nasdaq: SPEX), filed a patent infringement suit against T-Mobile.

A Seeking Alpha article said to keep an eye on Dendreon (Nasdaq: DNDN) as European regulators prepare for a final decision on the company's prostate cancer treatment Provenge. The biotechnology firm will also report second quarter earnings later this week.

Hansen Medical (Nasdaq: HNSN) enrolled its first patients in a new study of its Hansen Medical's Artisan family of Control Catheters with its Sensei X Robotic Catheter System to treat atrial fibrillation.

On the downside

Nam Tai Electronics (NYSE: NTE) fell to a loss for the second quarter.

Meadowbrook Insurance Group (NYSE: MIG) entered an agreement with State National Insurance for use of an "A" rated policy issuance after A.M. Best downgraded Meadowbrook to a B++ rating on Friday.

E.W. Scripps (NYSE: SSP) reported sharply lower second quarter earnings.

In the broad market, declining issues outpaced advancers by a margin of nearly 5 to 3 on the NYSE while advancers edged out decliners by more than 10 to 9 on Nasdaq. The broader S&P 500 lost 5 points to 1704.