Benzinga's Volume Movers

shares climbed 10.61% to $254.94. The volume of Pharmacyclics shares traded was 2448% higher than normal.

announced its plans to acquire Pharmacyclics for $261.25 per share in cash and stock.

surged 8.25% to $21.65. The volume of Heritage Insurance shares traded 1083% higher than normal. Heritage Insurance reported upbeat results for the fourth quarter.

shares moved up 26.76% to $18.90. The volume of Second Sight Medical Products traded was 1030% higher than normal. Second Sight Medical Products reported the successful first implants of the Argus II Retinal Prosthesis System at two new centers in Italy.

shares rose 8.07% to $21.22. The volume of Celladon shares traded was 901% higher than normal. Roth Capital initiated coverage on Celladon with a Buy rating.