Benzinga's Unusual Volume (WBMD, ISRG, PRGO)

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:

- WebMD Corp (NASDAQ: WBMD) up 5.58%, volume up 1,938%. Reported outstanding quarter.
- Intuitive Surgical (NASDAQ: ISRG) up 1.03%, volume up 137%.
- Perrigo Company (NASDAQ: PRGO) up 1.38 %, volume up 93%.

Stocks falling on unusual volume:

- Telvent GIT (NASDAQ: TLVT) down 17.06%, volume up 2,152%.
- Grand canyon Education (NASDAQ: LOPE) down 4.37%, volume up 1,298%.
- Fuel Systems Solutions (NASDAQ: FSYS) down 4.12%, volume up 1,179%. Not sure why FSYS is down on significant volume when they preannounced to the upside.

Fuel Systems Solutions may be providing an opportunity to get into the stock if the sell off is unwarranted.