Benzinga's Volume Movers

shares climbed 22.27 percent to $24.98. The volume of Youku Tudou shares traded was 2362 percent higher than normal.

announced a $3.5 billion takeover bid for Youku Tudou.

shares rose 6.56 percent to $43.21. The volume of Natus Medical shares traded was 731 percent higher than normal. Natus Medical announced a supply agreement totaling $232.5 million with the Ministry of Health of Venezuela. Natus Medical is expected to report Q3 results on October 21st.

surged 13.11 percent to $15.53. The volume of Weibo shares traded was 689 percent higher than normal. Weibo shares have dropped 23.85 percent over the past 52 weeks, while the S&P 500 index has gained 7.27 percent in the same period.

shares moved up 4.40 percent to $33.00. The volume of Concordia Healthcare traded was 371 percent higher than normal. Concordia Healthcare's trailing-twelve-month operating margin is 42.87 percent.