Current Report · Items 8.01, 9.01 · 8-K

Emergent Biosolutions, Inc.

EBSNYSEEQUITYCurrent

Other Events

Filed Sep 1, 2026Accepted Sep 1, 2026, 4:13 PM EDTCIK 1367644Accession 0001367644-26-000088

Company context

Joseph Papa President and Chief Executive Officer Richard Lindahl EVP, Chief Financial Officer and Treasurer Jessica Perl SVP, General Counsel and Corporate Secretary Paul Williams SVP, Products Business Coleen Glessner EVP, Quality, Ethics and Compliance Simon Lowry, M.D. Chief Medical Officer, Head of Research and Development Stephanie Duatschek SVP, Chief Strategy and Transformation Officer Michelle Pepin SVP, Chief Human Resources Officer Bill Hartzel SVP, Manufacturing and Bioservices Emergent’s Executive Management Team

Current securities

EBSNYSE · EQUITY · Current

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Disclosure sections

Items 8.01, 9.01

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Item 8.01Item 8.01 - Other Events

Item 8.01 Other Events On August 18, 2026, Emergent BioSolutions Inc. (“Emergent”) received a contract modification (“Modification No. 21”) of the BARDA AV7909 Contract (as defined below) from the Office of the Assistant Secretary for Preparedness and Response to procure additional doses of CYFENDUS™ (Anthrax Vaccine Adsorbed, Adjuvanted) (previously known as “AV7909”) valued at $24 million. This modification relates to Emergent’s AV7909 development and procurement contract with the Biomedical Advanced Research and Development Authority (“BARDA”), which became effective on September 30, 2016 (the “BARDA AV7909 Contract”) and has been modified from time to time. The preceding description of Modification No. 21 does not purport to be complete and is qualified in its entirety by reference to the full text of Modification No. 21. Modification No. 21, with relevant redactions to protect confidential and sensitive information, is filed herewith as Exhibit 10.1 and is incorporated herein by reference. The BARDA AV7909 Contract is filed as a material agreement of Emergent as Exhibit 10.51 with Emergent’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025. On September 1, 2026, Emergent issued a press release announcing the contract modification. A copy of the press release is furnished as Exhibit 99.1 to this Current Report and incorporated herein by reference.

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