Enova Systems Inc. (AMEX: ENA) picked up 22.55 percent in price Monday afternoon to $1.25. Volume of 180,330 shares was nearly four times its three-month average share volume. ENA is a production company in an emerging industry and a leading developer of proprietary electric, hybrid and fuel cell digital power management systems.

Bank of Ireland (NYSE: IRE) did brisk business Monday, trading in 29,498,405 shares, dwarfing its three-month average share volume of 6.2 million. Prices jumped 20.83 percent to $1.71, in the aftermath of the E.U. move to bail out Irish banks.

Noah Holdings Ltd. (NYSE: NOAH) dropped by 8.04 percent Monday afternoon to $16.92. Volume of 352,300 shares was a pittance compared to its usual three-month average share volume of 1,377,410. Shanghai-based NOAH provides investment advisory and wealth management services.