Shares of Bristow Group ( BRS) climbed after the Houston-based helicopter and production management services company was upgraded by Jefferies & Co. to buy from hold. Shares rose $2.28, or 7.4%, to $33.18 in recent trading.

Alderwoods Group ( AWGI) surged on news that the Cincinnati-based funeral home operator had signed a definitive agreement with Service Corporation International ( SCI) where SCI will acquire all of Alderwoods Group's outstanding shares for $20 a share in cash in a deal valued at $856 million.

About $374 million of Alderwoods Group's debt will remain outstanding or be refinanced. With Alderwoods, SCI will have about $2.5 billion in revenue, and a network of 1,712 funeral homes and 490 cemeteries in 48 states, eight Canadian provinces and Puerto Rico. Shares of Alderwoods Group gained $1.46, or 8.2%, to $19.36 in recent trading. Service Corporation International rose 69 cents, or 8.9%, to $8.49.

Linktone ( LTON) gained after the Shanghai-based wireless media company was upgraded by Susquehanna Financial to positive from neutral. Also, the company announced the appointment of Michael Guangxin Li as CEO. Prior to his appointment to the board in February, Li was Linktone's chief operating officer from March 2003 to January 2006. Shares gained 75 cents, or 11.5%, to $7.30 in recent trading.

Peru Copper slumped after the Canadian-based company reported a wider loss for 2005. The company posted a loss of $3.4 million as compared to a loss of $300,000 in 2004. Administration expenses increased to $4.2 million for 2005, up from $500,000 for the 2004 year, primarily as a result of new operating costs incurred from the increase in corporate activities and an increase in stock-based compensation. Shares fell 23 cents, or 8.8%, to $2.39 in recent trading.

Wild Oats Markets stumbled after the Boulder, Colo.-based natural foods supermarket chain operator said Stephen Kaczynski, senior vice president of sales and merchandising had resigned from the company to become president of another retail grocery chain. Shares dropped $1.39, or 6.9%, to $18.94 in recent trading.