These are stocks that gapped up today and had open prices higher than the close on the previous trading day:

  • Altera (ALTR) gapped up today, opening at $34.49 after closing the previous trading session at $30.67. The stock price is up 13.5% with a volume of 3.8 million. Shares are up, having risen $3.02 (9.5%) from a price of $31.78 on July 18, 2012. The stock has moved up across its 50-day moving average of $32.46 today.

  • Symantec (SYMC) closed the previous trading session at $13.18, gapping up to open at $14.61 today. Shares are up 15.3% and trading at a volume of 8.3 million. Share price has been climbing, and is up $1.61 (11.9%) from a price of $13.58 on July 18, 2012. The stock has moved up across its 50-day moving average of $14.12 today.

  • Ancestry.com (ACOM) opened at $31.30 after closing the previous trading session at $27.23, gapping up. Trading at a volume of 915,640, the stock price is up 15.4%. The stock is trading 17.7% above its 50-day moving average and 19.7% above its 200-day moving average.

  • VirnetX Holding Corporation (VHC) closed the previous trading session at $27.08, gapping up to open at $30.75 today. Shares have risen 13.5%, trading at a volume of 869,785. Share price is up, having risen $3.63 (10.6%) from $34.38 on June 25, 2012. The stock has moved up across its 200-day moving average of $28.57 today.

  • Silicon Laboratories (SLAB) opened at $38.98 after closing the previous trading session at $34.94, gapping up. The stock price is up 12.8% with a volume of 291,708. Over the last two months, shares have shown some positive movement as the price has climbed $5.23 (15.3%) from a price of $34.17 on May 25, 2012. The stock has moved up across its 200-day moving average of $39.13 today.

  • The Medicines Company (MDCO) gapped up today, opening at $25.24 after closing the previous trading session at $22.88. Trading at a volume of 330,940, the stock price is up 13.4%. The stock has been on an upward trajectory over the last two months, rising $4.45 (20.7%) from a price of $21.49 on May 25, 2012. The stock has moved up across its 50-day moving average of $23.09 today.

  • Pinnacle Entertainment (PNK) closed the previous trading session at $9.02, gapping up to open at $10.06 today. Shares are up 9.1% and trading at a volume of 210,704. The stock has fallen over the last three months, dropping $1.45 (-12.8%) from $11.29 on April 27, 2012. The stock has moved up across its 50-day moving average of $9.43 today.

  • Pluristem Therapeutics (PSTI) opened at $3.50 after closing the previous trading session at $3.18, gapping up. While trading at a volume of 531,384, the stock price has risen 4.1%. The stock is trading 27.7% above its 50-day moving average and 24.9% above its 200-day moving average.

  • Dex One Corporation (DEXO) closed the previous trading session at $1.21, gapping up to open at $1.35 today. The stock price is up 5.8% with a volume of 440,391. The stock has moved up across its 200-day moving average of $1.24 today.