X0303 4 2010-05-17 0000072444 NABI BIOPHARMACEUTICALS NABI 0001428524 Kessler Paul D. C/O NABI BIOPHARMACEUTICALS 12276 WILKINS AVE ROCKVILLE MD 20852 0 1 0 0 SVP Clinical, Med. & Reg.; CMO Common Stock 2010-05-17 4 S 0 300 5.68 D 112952 D Common Stock 2010-05-17 4 S 0 50 5.685 D 112902 D Common Stock 2010-05-17 4 S 0 850 5.69 D 112052 D Common Stock 2010-05-17 4 S 0 1000 5.695 D 111052 D Common Stock 2010-05-17 4 S 0 3205 5.70 D 107847 D Common Stock 2010-05-17 4 S 0 700 5.705 D 107147 D Common Stock 2010-05-17 4 S 0 3592 5.71 D 103555 D Common Stock 2010-05-17 4 S 0 100 5.715 D 103455 D Common Stock 2010-05-17 4 S 0 1900 5.72 D 101555 D Common Stock 2010-05-17 4 S 0 100 5.725 D 101455 D Common Stock 2010-05-17 4 S 0 1400 5.73 D 100055 D Common Stock 2010-05-17 4 S 0 1003 5.74 D 99052 D Common Stock 2010-05-17 4 S 0 600 5.75 D 98452 D Common Stock 2010-05-17 4 S 0 200 5.76 D 98252 D The sales reported in this Form 4 were effected pursuant to a 10b5-1 trading plan. James E. Dawson, as attorney-in-fact 2010-05-19