X0306 4/A 2016-07-29 2016-08-02 0 0001671584 Aptevo Therapeutics Inc. APVO 0001367644 Emergent BioSolutions Inc. 400 PROFESSIONAL DR, SUITE 400 GAITHERSBURG MD 20879 0 0 1 0 Common Stock, par value $0.001 per share 2016-07-29 4 J 0 20228849 0.00 A 20229849 D Common Stock, par value $0.001 per share 2016-08-01 4 J 0 20229849 0.00 D 0 D On July 29, 2016, Aptevo Therapeutics Inc. ("Aptevo") issued 20,228,849 shares of its common stock to its parent, Emergent Biosolutions Inc ("Emergent"), as partial consideration for Emergent's transfer of its biosciences business to Aptevo. On August 1, 2016, Emergent made a pro rata distribution of 100% of the outstanding shares of Aptevo common stock to Emergent stockholders of record as of July 22, 2016, the record date for the distribution. This Form 4/A is being filed to correct a typographical error on the shares acquired, disposed of, and beneficially owned following the acquisition. /s/ Eric Burt, Assistant Secretary 2016-08-04