Juniper, the No. 2 maker of networking gear, jumped $7, or 30.5percentto to $29.93.
A.M.D. is the world's No. 2 maker of microprocessors, behind Intel.
Ancor, based in Eden Prairie, Minn., is the No. 2 maker of fiber channel switches, behind Brocade Communications Systems Inc.
Lexmark, the No. 2 maker of inkjet printers after Hewlett-Packard, also raised its fourth-quarter outlook slightly.
Boston Scientific., the world's No. 2 maker of stents that help prop open arteries, dropped $2.70, to $43.25.
Dell, the No. 2 maker of personal computers, is seeking to retake market share from Hewlett-Packard.
SanDisk, the No. 2 maker of hand-held players, now offers support for another format, Rhapsody DNA, creating an additional player-and-service pairing.
Aprilia of Italy, Europe's No. 2 maker, says it is pursuing a shift that it started last year toward higher-powered scooters and motorcycles.
The Sony Corporation the world's No. 2 maker of home electronic appliances, said last week that it would eliminate 400 manufacturing jobs in the region.
Advanced Micro Devices, the world's No. 2 maker of computer chips, behind Intel, announced two new fast processors yesterday at the CeBIT trade show in Hanover, Germany.
Shares of Summit, the No. 2 maker of eye lasers, rose $5.8125 each, or 45percentto to $18.50, in Nasdaq trading.
