Benzinga's Volume Movers (GPRE, CAGC, SLB)

Unusual volume is a great opportunity to watch the true economics of investing as supply and demand change stock prices. The following stocks give a great list of what is moving in the market and why.

Stocks rising on unusual volume:

- Green Plains Renewable Energy (NASDAQ: GPRE) up 17.11%, volume up 2,890%. Rising on earnings results.
- China Agritech (NASDAQ: CAGC) up 7.22%, volume up 305%.
- Drew Industries (NYSE: DW) up 5.43%, volume up 224%.
- Telestone Technologies Corp. (NASDAQ: TSTC) up 7.32%, volume up 156%.
- Blue Coat Systems (NASDAQ: BCSI) up 2.21%, volume up 135%.

Stocks falling on unusual volume:

- Schlumberger (NYSE: SLB) down 5.9%, volume up 1,915%. Falling on bid for Smith International (NYSE: SII)
- Salix Pharmaceuticals (NASDAQ: SLXP) down 4.1%, volume up 655%. Fell on earnings results.
- Duoyuan Global Water (NYSE: DGW) down 8.88%, volume up 558%.
- Valassis Communications (NYSE: VCI) down 4.94%, volume up 528%. Fell on earnings results and outlook.
- Unit Corp. (NYSE: UNT) down 1.08%, volume up 367%.