X0306 4 2016-03-01 0 0001367644 Emergent BioSolutions Inc. EBS 0001380185 El-Hibri Fuad 400 PROFESSIONAL DRIVE, SUITE 400 GAITHERSBURG MD 20879 1 1 1 0 Chairman Common Stock 2016-03-01 4 A 0 26303 0.00 A 1797908 D Common Stock 2350331 I By Intervac, L.L.C. Common Stock 1524155 I By Biovac, L.L.C. Employee Stock Option (right to buy) 33.83 2016-03-01 4 A 0 53192 0.00 A 2023-02-28 Common Stock 53192 53192 D Consists of restricted stock units granted under the Amended and Restated Emergent BioSolutions Inc. 2006 Stock Incentive Plan, as amended. The restricted stock units and options vest in three equal installments on February 28, 2017, February 28, 2018 and February 28, 2019. This number corrects a historical scrivener's error that occurred more than two years ago. Prior to the transaction reported herein, for purposes of Section 16 of the Exchange Act, Mr. El-Hibri directly held a pecuniary interest in 1,771,605 shares of Common Stock. Mr. El-Hibri's holdings through Intervac, L.L.C. include 1,638,403 shares of Common Stock held by Mr. El-Hibri and his wife, as tenants by the entirety, through their 37.7% equity interest in Intervac, L.L.C.; 127,721 shares held by Mr. El-Hibri's wife; and 584,207 shares held by trusts indirectly controlled by Mr. El-Hibri or his wife. Mr. El-Hibri disclaims beneficial ownership, for purposes of Section 16 of the Exchange Act or otherwise, of those shares held solely by his wife and those shares held by the trusts. Mr. El-Hibri holds individually and with his wife, as tenants by the entirety, an aggregate 89.2% equity interest in Biovac, L.L.C. Biovac, L.L.C. is the direct owner of 1,524,155 shares of Common Stock. Mr. El-Hibri disclaims beneficial ownership of the shares of Common Stock directly owned by Biovac, L.L.C. for purposes of Section 16, except to the extent of his pecuniary interest in 1,359,546 shares. /s/ Carl A. Valenstein, attorney-in-fact 2016-03-03