Benzinga's Volume Movers

Willis Group Holdings PLC WSH shares climbed 5.57 percent to $47.93. The volume of Willis Group shares traded was 1447 percent higher than normal. Willis Group and Towers Watson & Co TW announced an all-stock merger deal valued at $18 billion. Juno Therapeutics Inc JUNO surged 19.74 percent to $55.44. The volume of Juno Therapeutics shares traded 1157 percent higher than normal. Juno Therapeutics signed a 10-year drug development pact with Celgene Corporation CELG after the bell Monday. Pentair plc. Ordinary Share PNR shares moved up 4.73 percent to $67.48. The volume of Pentair traded was 653 percent higher than normal. The Wall Street Journal reported that Trian Fund Management LP, Nelson Peltz's $11 billion hedge fund, built a 7.24 percent stake in Pentair. TreeHouse Foods Inc. THS shares rose 8.96 percent to $80.78. The volume of TreeHouse Foods shares traded was 509 percent higher than normal. ConAgra Foods Inc CAG announced it plans to exit its private label business.