Material Event (Form 8-K)

Armata Pharmaceuticals, Inc. ("Armata" or the "Company") has set June 12, 2025 as the date for its 2025 annual meeting of stockholders (the "Annual Meeting"). The Annual Meeting will be held at 8:30 a.m. (Pacific Time), at the Company's principal executive offices at 5005 McConnell Avenue, Los Angeles, California 90066, or at such other time and location to be determined by the Company's Board of Directors and set forth in the Company's proxy statement for the Annual Meeting. Armata's stockholders of record at the close of business on April 17, 2025, will be entitled to notice of the Annual Meeting and to vote upon matters considered at the Annual Meeting.

The deadline for receipt of stockholder proposals and director nominations submitted pursuant to Section 2.6 of Armata's Amended and Restated Bylaws for consideration at the Annual Meeting is 5:00 p.m. (Eastern Time) on April 13, 2025 (the "Advance Notice Bylaws Provision Deadline"). Stockholder proposals and director nominations should be submitted in writing and must be received by the Corporate Secretary at Armata's principal executive offices at Armata Pharmaceuticals, Inc., 5005 McConnell Avenue, Los Angeles, California 90066, by the Advance Notice Bylaws Provision Deadline, in order to be considered timely. Stockholder proposals and nominations submitted pursuant to Armata's advance notice bylaw provisions must also comply with the advance notice provisions contained in Armata's Amended and Restated Bylaws and may be omitted if not in compliance with applicable requirements. Stockholders are urged to read the complete text of such advance notice provisions.