The markets traded lower during the midday with the Dow falling 48 points to 17,063 over cybersecurity concerns. Nasdaq lost 4 points to 4,587.

On the upside

Shares of WPCS International (Nasdaq: WPCS) continued rising.

Endocyte (Nasdaq: ECYT) stock extended its gains.

Chimerix (Nasdaq: CMRX) reported potentially favorable results in a Phase 2 study of brincidofovir to treat adenovirus.

On the downside

Profit taking weighed down shares of 21Vianet Group (Nasdaq: VNET).

Investors locked in profits (Nasdaq: CMGE) on China Mobile Games and Entertainment Group.

Profit takers sent shares of Giga-tronics (Nasdaq: GIGA) lower.

In the broad market, declining issues outpaced advancers by a margin of more than 3 to 1 on the NYSE and by nearly 5 to 2 on Nasdaq. The broader S&P 500 lost 5 points to 1995. Bitcoin slipped $2 to $467.