Among the companies whose shares are expected to actively trade in Monday's session is Allied World Assurance Company (AWH).

Allied World Assurance said it expects to record roughly $55 million to $65 million in catastrophe losses in the fourth quarter of 2011. Shares slipped 0.6% to $63.33 in after-hours trading.

 
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Alliant Energy Corp. (LNT) said Chairman and Chief Executive William D. Harvey would retire at the end of March and named its operating chief as his successor.

U.S. regulators said doctors can now test for the risk of a potentially fatal brain infection caused by Tysabri, a multiple sclerosis treatment sold by Biogen Idec (BIIB) and Elan Corp. (ELN, ELN.DB).

Country Style Cooking Restaurant Chain Co. (CCSC) named Adam J. Zhao as its new chief financial officer after its previous finance chief resigned.

Moody's Investors Service said it is reviewing Lions Gate Entertainment Corp.'s (LGF) credit rating for possible upgrade after the media company unveiled its latest acquisition.

Netflix Inc. (NFLX) said its longtime marketing chief will leave that position and assume a spot on the board, and it appointed a temporary replacement while the online video and DVD-rental company searches for a successor.

Old Republic International Corp.'s (ORI) mortgage-guaranty business was placed under supervision of insurance regulators Friday, the latest setback for the foundering sector.

Thor Industries Inc. (THO) said it repurchased 2 million shares of its stock in two private deals with different holders, which represents 3.6% of the recreational-vehicle maker's shares outstanding.

TransDigm Group Inc. (TDG) agreed to buy seatbelt-maker AmSafe Global Holdings Inc. for about $750 million in cash, continuing the aerospace supplier's recent streak of acquisitions.

-Edited by Maya Pope-Chappell and Ian Thomson; write to maya.pope-chappell@dowjones.com and ian.thomson@dowjones.com

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