X0306 4 2015-05-21 0 0001367644 Emergent BioSolutions Inc. EBS 0001193522 SULLIVAN LOUIS W 400 PROFESSIONAL DR, SUITE 400 GAITHERSBURG MD 20879 1 0 0 0 Common Stock 2015-05-21 4 A 0 9400 0 A 28500 D Consists of restricted stock units granted under the Third Amended and Restated Emergent BioSolutions Inc. 2006 Stock Incentive Plan. These restricted stock units vest in three equal annual installments beginning on 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. /s/Eric Burt, attorney-in-fact 2015-05-21