144 0001193522 XXXXXXXX LIVE 0001367644 EMERGENT BIOSOLUTIONS INC 001-33137 300 Professional Drive Gaithersburg, MD 20879 (240) 631-3200 LOUIS W SULLIVAN Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

104695 1336462.98 52519964 12/22/2025 NYSE Common 05/18/2016 Restricted Stock Issuer N 94390 05/18/2016 Not Applicable Common 05/10/2021 Exercised Shares Issuer N 10305 05/10/2021 Cash Y The securities to be sold were acquired upon the vesting of restricted stock during the period of 5/18/2016 through 5/25/2025 12/22/2025 /s/ Louis W. Sullivan