Among the stock activity stories for Friday, March 5, from AP Financial News:

NEW YORK (AP) ¿ Shares of Apple Inc. jumped to a record high amid a broader market rally after the technology company said its highly anticipated iPad tablets will go on sale April 3.

NEW YORK (AP) ¿ Shares of Dish Network Corp. got a boost after a Collins Stewart analyst upgraded the satellite TV operator, saying the bulk of a legal defeat from TiVo Inc. is now priced into the stock.

NEW YORK (AP) ¿ Shares of Dynamic Materials Corp. dropped sharply after the maker of explosion-welded clad metal plates turned in a fourth-quarter profit well below what analysts had been expecting.

NEW YORK (AP) ¿ Shares of ArcSight Inc., a provider of network security software and services, fell after its fiscal third-quarter profit missed analyst expectations.
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