Among the stock activity stories for Tuesday, Dec. 1, from AP Financial News:
PHILADELPHIA (AP) _ Shares of OmniVision Technologies Inc. fell after the company warned that its fiscal third-quarter revenue will fall short of expectations.
INDIANAPOLIS (AP) _ Shares of managed care company Cigna Corp. outpaced other health insurers as they climbed more in line with financial stocks.
NEW YORK (AP) _ Bond insurer Assured Guaranty Ltd. said it plans to cut between 15 percent and 20 percent of its staff by March.
SAN FRANCISCO (AP) _ Shares of Mentor Graphics Corp. climbed after a JPMorgan analyst upgraded the software maker's stock, predicting that spending on electronic design automation software will improve next year and Mentor may benefit from this earlier than others.
PHILADELPHIA (AP) _ Shares of Mattson Technology Inc. rose after an analyst upgraded the stock based on improving market demand and a big order coming from Samsung Electronics Co. Ltd., a major customer.