X0306 4 2017-08-15 0 0001367644 Emergent BioSolutions Inc. EBS 0001294935 Hauer Jerome M 400 PROFESSIONAL DR, SUITE 400 GAITHERSBURG MD 20879 1 0 0 0 Common Stock 2017-08-15 4 A 0 5153 25.47 A 29421 D Common Stock 2017-08-15 4 S 0 10776 35.8342 D 18645 D Stock Option (Right to Buy) 25.47 2017-08-15 4 M 0 5153 0.00 D 2022-01-21 Common Stock 5153 5152 D Consists of an option granted on January 22, 2015 under the company's stock incentive plan as amended and restated. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.70 to $36.05, inclusive. The reporting person will provide to the issuer, any security holder of the issuer, or the SEC staff, upon request, information regarding the number of shares sold at each price within the range. The option grant vests in three equal installments on the day prior to the first, second and third anniversary dates of the grant. /s/ Eric Burt, Attorney-in-fact 2017-08-17