X0306 4 2018-03-09 0 0001367644 Emergent BioSolutions Inc. EBS 0001380187 Abdun-Nabi Daniel 400 PROFESSIONAL DR, SUITE 400 GAITHERSBURG MD 20879 1 1 0 0 President & CEO Common Stock 2018-03-09 4 F 0 7825 51.84 D 213128 D Common Stock 1936 I By Son Consists of restricted stock units granted under the Amended and Restated Emergent BioSolutions Inc. 2006 Stock Incentive Plan, as amended. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose. /s/ Eric Burt, Attorney-in-fact 2018-03-13