Here are stocks that gapped up today with opening prices significantly higher than the close on the previous trading day:

  • Iron Mountain Incorporated (IRM) gapped up today, opening at $31.87 after closing the previous trading session at $28.40. While trading at a volume of 2.4 million, the stock price has risen 9.5%. Share price has been climbing, and is up $2.36 (8.2%) from a price of $28.73 on May 30, 2012. The stock has moved up across its 200-day moving average of $30.06 today.

  • Ancestry.com (ACOM) closed the previous trading session at $22.63, gapping up to open at $25.30 today. Shares are up 11.2% and trading at a volume of 990,009. Shares price has risen $3.40 (15.6%) from $21.76 on May 30, 2012. The stock has moved up across its 200-day moving average of $24.46 today.

  • VelocityShares 3x Long Silver ETN Linked to the S\x26P GSCI Silver Index ER (USLV) opened at $28.29 after closing the previous trading session at $25.42, gapping up. Trading at a volume of 492,355, the stock price is up 12.2%.

  • Savient Pharmaceuticals (SVNT) closed the previous trading session at 74 cents, gapping up to open at 85 cents today. While trading at a volume of 688,862, the stock price has risen 6.9%. The stock is trading at 57.5% of its 50-day moving average and 37.8% of its 200-day moving average.

  • NovaBay Pharmaceuticals (NBY) opened at $1.20 after closing the previous trading session at $1.09, gapping up. Shares are up 2.8% and trading at a volume of 143,236. Shares are up, having risen 17 cents (17.9%) from a price of 95 cents on May 30, 2012. The stock has climbed a step closer to its 50-day moving average, sitting at just 98.3% of the mark.

  • Westinghouse Solar (WEST) closed the previous trading session at 20 cents, gapping up to open at 23 cents today. The stock price is up 8.9% with a volume of 101,139. The stock is trading at 63.5% of its 50-day moving average and 41.8% of its 200-day moving average.