Benzinga's Volume Movers

shares climbed 15.40 percent to $37.18. The volume of BroadSoft shares traded was 507 percent higher than normal. BroadSoft reported better-than-expected results for the first quarter and raised its FY15 earnings guidance.

surged 7.31 percent to $16.30. The volume of Digital Ally shares traded 295 percent higher than normal. Digital Ally is expected to report Q1 results on Thursday, May 14, 2015.

shares moved up 15.18 percent to $15.78. The volume of Olympic Steel traded was 280 percent higher than normal. Credit Suisse upgraded Olympic Steel from Underperform to Outperform and raised the price target from $12.00 to $17.00.

shares rose 3.90 percent to $24.16. The volume of NutriSystem shares traded was 252 percent higher than normal. NutriSystem shares have jumped 38.06 percent over the past 52 weeks, while the S&P 500 index has gained 11.87 percent in the same period.