Mid-Day Market Movers (NHWK, AAI, BIOF, GFNCL)

NightHawk Radiology Holdings Inc NHWK jumped 96.31% to $6.38 at 10:21 am. Virtual Radiologic has agreed to acquire NHWK for $170 million or $6.50 per share in cash, representing a 100% premium over NHWK's closing price on Friday. AirTran Airways AAI climbed 59.56% to $7.26. Southwest Airlines LUV has agreed to acquire AAI for around $1.4 billion, or $7.69 per share, representing a 69% premium to AAI's closing price on Friday. BioFuel Energy Corp BIOF shares advanced 43.41% to $2.41. BIOF has signed a 6-month bridge loan agreement with Greenlight Capital Inc and Third Point LLC. General Finance Corporation GFNCL shares surged 38.67% to $2.08. GFNCL reported a 15% y/y rise in its Q4 revenue. Read more from Benzinga's Markets.