Take-Two Interactive Software (TTWO) An investor group including OppenheimerFunds and D.E. Shaw Valence Portfolios plans to nominate six board members March 23. Oppenheimer holds a 24.5% stake; D.E. Shaw Valence, 9%.

Manatron (MANA) Constellation Software offered to buy all Manatron's outstanding shares at $10 each; its $9 offer had been rejected. Constellation holds 278,550 shares (5.45%).

Great Wolf Resorts (WOLF) Jason Ader reiterated his demand that WOLF maximize value by selling itself. Ader holds 2.4 million shares (7.78%).

Laureate Education (LAUR) Laureate's No. 2 institutional shareholder, T. Rowe Price Associates, said the proposed management-led $60.50- a-share price is well below Laureate's long-term value. T. Rowe holds 4.2 million shares (8.1%).

Topps (TOPP) An investor group including Topps Director Arnaud Ajdler and Crescendo Investments believes a pending merger with Tornante and Madison Dearborn Partners isn't in Topps' best interest. The group holds 2.5 million shares (6.6%).

Trico Marine Services (TRMA) Top shareholder Kistefos suggested TRMA sell itself and return cash to shareholders via a dividend or stock buyback. Kistefos owns 3 million shares (20.2%).

PDL BioPharma (PDLI) Third Point urged CEO Mark McDade to cut costs and cease further acquisitions. Third Point holds 8 million shares, and options to buy 600,000 more (7.5%).

Ceridian (CEN) Pershing Square Capital Management's stake rose to 20.53 million shares (14.5%). On Feb. 27, Pershing exercised call options to buy 3 million shares at an exercise price of $24.26 each and calls to buy 1 million at $24.44. On Feb. 28, it purchased 808,400 more shares for $32.59 each.