Benzinga's Volume Movers (DWSN, CTCT, SFLY, NXTM)

Dawson Geophysical Company DWSN shares moved up 2.95% to $43.96 at 10:15 am. The volume of DWSN shares traded was 340% higher than normal. DWSN announced its plans to buy TGC Industries Inc TGE in an all-stock deal for about $157 million. Constant Contact Inc CTCT shares rose 3.45% to $34.18. The volume of CTCT shares traded was 74% higher than normal. CTCT's PEG ratio is 0.86. Shutterfly Inc SFLY shares climbed 3.25% to $44.43. The volume of SFLY shares traded was 71% higher than normal. SFLY reported its plans to acquire Tiny Prints Inc for $141 million in cash and 3.9 million shares. NxStage Medical Inc NXTM shares gained 4.22% to $22.00. The volume of NXTM shares traded was 24% higher than normal. NXTM shares have jumped 101.24% over the past 52 weeks, while the S&P 500 index has gained 16.02% in the same period. Read more from Benzinga's Markets.