Movers roundup: Lehman, National Semiconductor

Among the stock activity stories for Monday, Sept. 8, from AP Financial News:

NEW YORK (AP) _ Lehman Brothers Holdings Inc. shares tumbled Monday amid investor uncertainty about how the nation's fourth-largest brokerage will find much-needed capital to help shore up its balance sheet.

SAN FRANCISCO (AP) _ Shares of National Semiconductor Corp., which makes analog chips for cell phones and other gadgets, slipped Monday as investors punished the company for the second trading day in a row over its soft sales guidance.

SAN FRANCISCO (AP) _ Shares of Intersil Corp., which makes power-management chips for PCs and other analog chips for devices like cell phones and flat-panel TVs, fell to a new 52-week low Monday after UBS cut its rating on the stock.

NEW YORK (AP) _ Shares of Morgan Stanley advanced Monday, in step with a rally in the market's financial sector, despite an analyst's reduction in earnings estimates for the No. 2 U.S. investment bank.

NEW YORK (AP) _ Shares of Alvarion Ltd. jumped Monday after an Oppenheimer & Co. analyst upgraded the Israeli provider of wireless broadband technology and services, saying it has shown "good execution in a challenging market."