U.S. HOT STOCK FUTURES: HOT STOCKS TO WATCH

Among the companies with shares expected to actively in Tuesday's session is Rosetta Resources Inc. (ROSE).

Independent oil-and-gas company Rosetta Resources will replace Catalyst Health Solutions Inc. (CHSI) in the S&P MidCap 400 index after the close of trading Thursday. Shares were up 4.2% to $38.01 after hours.

Watchlist:

Brookdale Senior Living Inc. (BKD) named Jeffrey R. Leeds as its nonexecutive chairman, replacing Wesley R. Edens, who had been chairman since the company was formed and will stay on the board.

Standard & Poor's Ratings Services boosted CF Industries Holdings Inc. (CF) into investment-grade territory, citing the fertilizer producer's recent operating performance and leverage-related metrics.

Corporate Executive Board Co. (EXBD) has agreed to acquire privately held U.K.-based talent-testing company SHL for $660 million in cash as it seeks to expand its market.

Microsoft Corp. (MSFT) said it will record a $6.2 billion goodwill writedown in its online services division, to be recorded in its fiscal fourth quarter.

Penson Worldwide Inc. (PNSN) named Vice Chairman Daniel P. Son as interim chief executive, succeeding Philip A. Pendergraft, who is retiring as CEO and as a board member.

SourceFire Inc. (FIRE) said its chief executive officer, John Burris, has taken a medical leave of absence to undergo treatment for colon cancer and said it expects second-quarter results to be at the high end of or exceeding its expectations.

TranSwitch Corp. (TXCC) has named a new board chairman, and unveiled a restructuring plan aimed at saving $8 million in employee-related costs and other areas.

-Write to Nathalie Tadena at [e-mail]