8 Biggest Mid-Day Gainers For Tuesday

Rosetta Genomics Ltd. (USA) ROSG shares climbed 17.54 percent to $1.34 as the company reported that it has received an approval from the New York State for HEME FISH-based assays.
Stone Energy Corporation SGY shares gained 17.4 percent to $7.95.
American Science & Engineering, Inc. ASEI shares surged 13.64 percent to $36.75 as the company agreed to be acquired by OSI Systems, Inc. OSIS for $37 per share in cash.
Imperva Inc IMPV shares surged 10.83 percent to $44.82. Elliott Associates reported a 9.8 percent stake in Imperva, according to 13D filing.
Archrock Partners LP APLP shares rose 10.03 percent to $13.71. Goldman Sachs upgraded Archrock Partners from Neutral to Buy and raised the price target from $9.00 to $14.00.
Opko Health Inc. OPK gained 6.64 percent to $9.80 on confirmation that the FDA has approved NDA for Rayaldee to treat certain symptoms of chronic kidney disease.
Cirrus Logic, Inc. CRUS shares rose 4.4 percent to $40.02. Canaccord Genuity initiated coverage on Cirrus Logic with a Buy rating and a $52.00 price target.
Neustar Inc NSR rose 2.4 percent to $24.60 in pre-market trading after the company announced plans to separate into two, publicly-traded companies.