Here are the results for today's unusual stock volume scan. The scan looks at the previous day's volume and compares it to the recent average volume. It then sorts the stocks based on those that showed the biggest increase (the "unusual" part) in volume.

Companies included in today's scan are: Allot Communications Ltd. (ALLT), Orexigen Therapeutics Inc. (OREX), Intuitive Surgical Inc (ISRG), PROGRESS ENERGY INC (PGN), TD Ameritrade Holding (AMTD), Ambac Financial Group (ABK), Immucor Inc (BLUD), Parametric Technology (PMTC), Sears Holdings Corp (SHLD), Wal-Mart Stores (WMT), Hansen Medical, Inc. (HNSN), Input/Output (IO), Shaw Group (SGR), RF Micro Devices Inc (RFMD), Helen of Troy (HELE), Lan Chile S.A. (LFL), Level 3 Communications Inc (LVLT), Elan, plc (ELN), Varian Medical Systems (VAR), Nordic American Tanker Shipping (NAT), J. Crew Group, Inc. (JCG), Gamestop Corp (GME), Palm Inc (PALM), Novellus Systems (NVLS), Whole Foods Market (WFMI).

These are the top stocks from today's scan, which has some basic filters to eliminate penny stocks and those that don't trade frequently. A description of the column headings is below.

• Move Previous Day - yesterday's percent return.
• Volume Increase - looks at the previous day's volume and compares it to the recent average volume. It then sorts the stocks based on those that showed the biggest increase (the "unusual" part) in volume.
• Close - yesterday's closing price.
• Total Ratings - number of analysts who track the stock, according to Zacks.
• Buy Percent - percent of the analysts who rate the stock as a "buy". I use this to help gauge sentiment and potential buying demand. If everyone already loves a stock, that means a steady stream of new money will need to enter the stock to fuel a rally.

Note - sentiment data is current as of the previous trading day...