X0306 4 2018-02-27 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 2018-02-27 4 A 0 13371 0.00 A 217505 D Common Stock 2018-02-27 4 A 0 13371 0.00 A 230876 D Common Stock 2018-02-27 4 F 0 3324 49.64 D 227552 D Common Stock 2018-02-28 4 F 0 6599 49.97 D 220953 D Common Stock 1936 I By Son Employee Stock Option (right to buy) 49.64 2018-02-27 4 A 0 53485 49.64 A 2025-02-26 Common Stock 53485 53485 D Consists of restricted stock units granted under the Amended and Restated Emergent BioSolutions Inc. 2006 Stock Incentive Plan, as amended. These restricted stock units vest in three equal annual installments beginning on the day prior to the first anniversary of the date of grant, assuming continued service with the company. Each restricted stock unit represents the right of the Reporting Person to receive one share of common stock of Emergent BioSolutions Inc., subject to adjustment as provided in the grant agreement. Consists of performance stock units granted under the Amended and Restated 2006 Emergent BioSolutions Inc. Stock Incentive Plan, as amended. Each PSU represents a right to receive one share of common stock. The PSUs vest upon achievement with respect to net income as a percentage of total revenue for the 2020 fiscal year, each as determined in accordance with GAAP, as certified by the Compensation Committee following the performance period. Vests in three equal installments on February 26, 2019, February 26, 2020 and February 26, 2021. 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 2018-03-01