The companies whose shares are actively trading in Wednesday's morning session include Orchid Cellmark, MSC Industrial, Nu Skin Enterprises, Clean Harbors and American Superconductor.
Shares of Orchid Cellmark Inc. (NASDAQ:ORCH) surged 38 percent, or 76 cents, to $2.77 after LabCorp (NYSE:LH) agreed to take over Orchid for about $85.4 million, or $2.80 a share.
Nu Skin Enterprises (NYSE:NUS) shares gained 7 percent after it projected its first quarter revenue to come better than its original forecast.
Shares of Clean Harbors (NYSE:CLH) advanced 6 percent after it agreed to buy Peak Energy Services (TSX: PES) for about C$196 million, including debt.
MSC Industrial Direct's (NYSE:MSM) shares were up 7 percent, or $4.71, to $75.21, after its second quarter results topped Street view and gave a strong outlook for the third quarter.
Shares of American Superconductor Corp. (NASDAQ:AMSC) plunged 48 percent, or $11.96, to $12.92, day after the company expected to report a loss for its fourth quarter.