Benzinga's Volume Movers

Covidien plc COV shares moved up 21.99% to $87.86. The volume of Covidien shares traded was 3599% higher than normal. Medtronic MDT announced its plans to buy Covidien for $42.9 billion in cash and stock. bluebird bio BLUE shares rose 40.55% to $36.67. The volume of bluebird bio shares traded was 3499% higher than normal. bluebird bio presented positive data on LentiGlobin BB305 at the European Hematology Association (EHA). TW Telecom TWTC shares climbed 6.60% to $38.74. The volume of TW Telecom shares traded was 2246% higher than normal. TW Telecom agreed to be acquired by Level 3 Communications LVLT in a stock-and-cash transaction valued at $40.86 per share. Fusion-io FIO surged 23.17% to $11.43. The volume of Fusion-io shares traded 1919% higher than normal. SanDisk SNDK announced its plans to buy Fusion-io for $11.25 per share in cash.