The Dow, Nasdaq, and S&P are all weak today, as they are down .3% to .45%, but a few companies are bucking that trend and are up big on good volume.  Some of the biggest gaining Nasdaq stocks have been Conversant (CNVR), 21Vianet Group (VNET), Ocean Power Tech (OPTT), El Pollo Loco (LOCO), and Fifth Third Bancorp (FITB).