X0303 4 2011-02-25 1 0000892025 MARTEK BIOSCIENCES CORP MATK 0001252573 KELLER JEROME C 6480 DOBBIN RD COLUMBIA MD 21045 1 0 0 0 Common Stock 2011-02-25 4 A 0 2533 0.00 A 2533 D Common Stock 2011-02-25 4 D 0 2533 31.50 D 0 D Restricted Stock Units 2011-02-25 4 M 0 2533 0.00 D Common Stock 2533 0 D Stock Option (right to buy) 27.97 2011-02-25 4 D 0 35000 3.53 D 2013-03-20 Common Stock 35000 0 D Represents shares of Martek's common stock acquired on the vesting of restricted stock units originally granted in March 2010. Pursuant to Martek's Amended and Restated 2004 Stock Incentive Plan and the Agreement and Plan of Merger, dated December 20, 2010, between Martek, Koninklijke DSM N.V. and Greenback Acquisition Corporation ("Purchaser"), immediately prior to the consummation of the merger of Purchaser (the "Merger") with and into Martek, the restricted stock units vested in full and were settled for shares of common stock with the right to receive the per share Merger consideration of $31.50. The Merger was consummated on February 25, 2011. Disposed of pursuant to the Merger. Each restricted stock unit represents a contingent right to receive one share of Martek common stock. These restricted stock units, which were to vest on the earlier of the one-year anniversary of their grant date of March 19, 2009 or the date of the first annual meeting after the grant date, had their vesting accelerated pursuant to the Merger Agreement and were settled for shares of common stock of Martek. This option was cancelled in the merger in exchange for a cash payment equal to the difference between the exercise price of the option and the $31.50 consideration payable in the merger for each share of Martek common stock. /s/ Jerome C. Keller By: David M. Feitel Attorney-in-fact Jerome C. Keller 2011-03-01