Dex One Corporation (NYSE: DEXO) climbed 13.5 percent in price Wednesday to $8.75. Volume of 950,282 shares surpassed its all-day average of 621,472. The marketing consulting firm helps local businesses reach, win and keep ready-to-buy customers.

Cisco Systems Inc. (Nasdaq: CSCO) was a volume whiz Wednesday, trading in 50,051,376 shares, still below its daily average of 70,740,300. Prices for the stock gained 1.2 percent to $20.76. CSCO has a news conference planned for today in Las Vegas, during which it will make an announcement regarding its role in helping service providers and content providers meet the challenges and opportunities presented by the convergence of pay TV, online and on-demand video.

Mattson Technology Inc. (Nasdaq: MTSN) dropped 10.2 percent Wednesday to $2.30, on volume of 3,698,718 shares, nearly seven times its full-day average. MTSN, based in Fremont, Calif., is a leading supplier of advanced process equipment used to manufacture semiconductors.