On February 7, 2024, KBR, Inc. entered into Amendment No. 12 (the Amendment) to its existing Credit Agreement, dated as of April 25, 2018 (as amended by Amendment No. 1, dated as of November 12, 2018, Amendment No.

2, dated as of February 7, 2020, Amendment No. 3, dated as of July 2, 2020, Amendment No. 4, dated as of September 14, 2020, Amendment No.

5, dated as of November 18, 2021, Amendment No. 6, dated as of May 17, 2022, Amendment No. 7, dated as of December 30, 2022, Amendment No.

8, dated as of February 6, 2023, Amendment No. 9, dated as of June 6, 2023, Amendment No. 10, dated as of July 26, 2023, and Amendment No.

11, dated as of January 19, 2024, the Existing Credit Agreement, and as further amended by the Amendment, the Credit Agreement), with Bank of America, N.A., as administrative agent, swing line lender and a letter of credit issuer, the lenders party thereto and each of the subsidiaries of the company party thereto. Pursuant to the Amendment, the Existing Credit Agreement was amended to, among other things: (1) continue the aggregate $1.0 billion of commitments under the revolving credit facility (the revolving facility), of which $117 million was utilized and outstanding immediately following the Amendment, (2) replace the term A-1, term A-2 and term A-4 loan facilities under the Existing Credit Agreement with a single amended term A-1 loan facility (the Term A-1 Facility) in an aggregate principal amount of approximately $352 million, (3) continue the term A-3 loan facility (the Term A-3 Facility and together with the Term A-1 Facility and the Revolving Facility, the Pro Rata Facilities) under the Existing Credit Agreement with an aggregate outstanding principal amount of approximately £116 million, (4) extend the maturity date of the Pro Rata Facilities to February 7, 2029, the fifth anniversary of the Amendment closing date and (5) effect additional modifications to the terms and provisions of the Existing Credit Agreement, including to reset certain baskets sizes, as further set forth in the Amendment. The Amendment did not change the interest rate margin applicable to the Pro Rata Facilities.