KBR, Inc. announced that Lt. General Vincent R. Stewart, USMC (Ret.), a member of Board, passed away on April 28, 2023. The Board expresses its gratitude and appreciation for Lt.

General Stewart’s service to the Company and its stockholders and sends its condolences to his family and friends. As of the date of this Supplement, the Board has determined not to fill the vacancy created by Lt. General Stewart’s passing, nor to appoint a successor nominee for election at the Annual Meeting.

Accordingly, the Board has reduced its size from ten to nine members.