Movers roundup: Sequenom, Allegheny Technologies

Among the stock activity stories for Monday, Jan. 12, from AP Financial News:

NEW YORK (AP) _ Shares of Sequenom Inc. slipped Monday, one trading day after the genetic analysis product maker offered to buy cancer test maker Exact Sciences Corp. for $41 million.

NEW YORK (AP) _ Shares of titanium producer Allegheny Technologies Inc. tumbled Monday after an analyst reduced his 2008 earnings-per-share estimate because of falling demand for the commodity and suggested investors "trim positions."

OVERLAND PARK, Kan. (AP) _ Shares of trucking company YRC Worldwide Inc. plunged more than 14 percent Monday after Fitch Ratings cut the company's debt rating.

NEW YORK (AP) _ Shares of Texas Roadhouse Inc. slipped Monday after an analyst downgraded the restaurant chain as more consumers choose to dine at home in a tough economy.

NEW YORK (AP) _ Shares of Ruth's Hospitality Group Inc. dropped Monday after the operator of the Ruth's Chris Steak House chain said its same-store sales dropped sharply at company-owned locations in the fourth quarter.

NEW YORK (AP) _ Shares of medical device maker EnteroMedics Inc. jumped Monday after the company said its implantable obesity treatment prompted weight loss in a study.