The markets opened lower with the Dow falling 42 points to 17,580 as terrorist explosions rocked Brussels. Nasdaq lost 6 points to 4,802.

On the upside

Akorn (Nasdaq: AKRX) reported preliminary unaudited financial results for 2015 and expects to file its restated 2014 financials by May 9, 2016.

NQ Mobile (NYSE: NQ) reversed year ago losses to post a profit for the fourth quarter as revenue surged.

Bargain hunters snapped up shares of Celldex Therapeutics (Nasdaq: CLDX).

On the downside

G-III Apparel Group (Nasdaq: GIII) disappointed with sharply lower fourth quarter earnings that fell far short of expectations and forecast current quarter earnings below estimates.

Adecoagro (NYSE: AGRO) priced its public offering of 12 million common shares at the discounted price of $11.70 per share.

Retreating crude oil prices weighed down shares of Denbury Resources (NYSE: DNR).

In the broad market, declining issues outpaced advancers by a margin of nearly 7 to 2 on the NYSE and by nearly 7 to 3 on Nasdaq. The broader S&P 500 lost 4 points to 2,046. Bitcoin gained $4 to $414.