Debt

12 Months Ended

Oct. 03, 2025

Debt Disclosure [Abstract]

Debt

Debt

Debt consisted of the following:

	As of
(Amounts in millions)	October 3, 2025		September 27, 2024
Term Loan	$	3,000	$	3,750
Senior notes	1,000		1,000
Other	8		17
Total debt	4,008		4,767
Unamortized original issue discount and unamortized deferred financing costs	(65)		(88)
Total debt, net of original issue discount and deferred financing costs	3,943		4,679
Less current portion of long-term debt	(42)		(36)
Total long-term debt, net of current portion	$	3,901	$	4,643

Credit Facility

On September 27, 2024, in connection with the consummation of the Transaction, we repaid all outstanding borrowings and other amounts under the prior first lien credit agreement and the prior second lien credit agreement dated as of January 31, 2020, as amended, (together, the “Prior Credit Agreements”) and the Prior Credit Agreements were terminated on September 27, 2024.

On September 27, 2024, we entered into a Credit Agreement (the “Credit Agreement”), by and among Amentum, the borrowing subsidiaries from time to time party thereto, the lenders from time to time party thereto and JPMorgan Chase Bank, N.A., as administrative agent, for a new senior secured credit facility (the “Credit Facility”). The Credit Facility provides for a seven year, $3,750 million term facility (“Term Loan”) and a five year, $850 million revolving facility (“Revolver”) including a $200 million letter of credit subfacility and a $100 million swingline subfacility. The Credit Agreement was originally entered into by Amentum Parent Holdings LLC, and Amentum became a party to, and a borrower under the Credit Agreement as a result of the merger between Amentum and Amentum Parent Holdings LLC entered into in connection with the Transaction. A portion of the Term Loan, in the amount of $1,130 million, was originally borrowed on September 27, 2024 by Amentum under a separate term credit agreement, also entered on September 27, 2024, but immediately after the effective time of the merger, that separate term credit agreement was superseded and replaced in its entirety by the Credit Agreement, and such portion of the term facility is now outstanding under, and governed by, the Credit Agreement. The remaining $2,620 million of the term facility was borrowed on September 27, 2024. The Revolver and the Term Loan mature on September 27, 2029 and September 27, 2031, respectively. The Credit Facility is secured by substantially all of our assets and guaranteed by substantially all of our domestic subsidiaries.

A portion of the Credit Facility was used, together with other cash sources, to repay in full all outstanding borrowings and other amounts under the Prior Credit Agreements and to pay related fees and expenses related to the financing and the related transactions. Proceeds of the Revolver under the Credit Agreement may be used for general corporate purposes.

In fiscal year 2025, we made voluntary principal payments on the Term Loan of approximately $191 million, $250 million and $281 million on June 27, 2025, July 31, 2025 and September 30, 2025, respectively, and as a result, we recognized $12 million of cost within loss on extinguishment of debt in the consolidated statements of operations during the fiscal year ended October 3, 2025. Due to the debt modification in fiscal year 2024, we recognized $31 million of debt issuance costs presented within loss on extinguishment of debt in the consolidated statements of operations for the year ended September 27, 2024. Further, we recognized $14 million of costs due to a loss on the debt modification presented within loss on extinguishment of

debt in the consolidated statements of operations during the fiscal year ended September 27, 2024. There was no such charge during the year ended September 29, 2023.

As of October 3, 2025 and September 27, 2024, the available borrowing capacity under the Credit Facility was $766 million and $808 million, respectively, and included $84 million and $42 million, respectively, in issued letters of credit. As of October 3, 2025 and September 27, 2024, there were no amounts borrowed under the Revolver.

Interest Rates on Term Loan

Under the Credit Facility, the interest rate per annum applicable to the Term Loan is, at the Company’s option, equal to either the Alternate Base Rate (“ABR”) plus 1.25% or the Term Secured Overnight Financing Rate (“SOFR”) plus 2.25%. The interest rate per annum shall be reduced by 0.25% in the event certain corporate ratings are achieved. The ABR is the rate equal to the highest of (a) the Prime Rate in effect on such day, (b) the New York Federal Reserve Bank (“NYFRB”) Rate in effect on such day plus 0.50% or (c) SOFR for a one-month interest period as published two U.S. Government Securities Business Days prior to such day plus 1.00%.

Term Loan Amortization Payments and Prepayments

Under the Credit Facility, we are required to make quarterly principal amortization payments equal to 0.25% of the original principal amount of the Term Loan, which commenced on March 31, 2025, with the remainder of the principal being due at maturity. Any repayments and prepayments of borrowings under the term facility may not be reborrowed. Beginning with fiscal year 2026, the Credit Facility contains an annual requirement to submit a portion of our excess cash flow (as defined in the Credit Facility), within ten business days of delivering annual financial statements, as a Term Loan prepayment. No such prepayments have been required or made.

Interest Rates on Revolver & Swingline Loans

Under the Credit Facility, borrowings under the Revolver are available in U.S. dollars, Canadian dollars, euro and Sterling. The interest rate per annum applicable to the Revolver, at the Company's option, is equal to either the ABR or Canadian Prime Rate plus 0.50% to 1.25% or the Term SOFR, EURIBOR or Term Canadian Overnight Report Rate Average (“CORRA”) plus 1.50% to 2.25% based on our first lien leverage ratio.

Interest Rates on Letter of Credit Subfacility and Unused Commitment Fees

Under the Credit Facility, a portion of the revolving facility is available for the issuance of letters of credit in U.S. dollars, Canadian dollars, euro, Sterling and certain other foreign currencies. The interest rate per annum applicable to the letter of credit subfacility is equal to a range between 1.50% to 2.25% based on our first lien leverage ratio. All of our letters of credit under the Credit Facility are also subject to a 0.125% fronting fee. The unused commitment fee on our Revolver is 0.25% to 0.40% based on our first lien leverage ratio.

Covenants

The Credit Agreement contains customary prepayment rights and customary mandatory prepayments, as well as customary affirmative and negative covenants that apply to Amentum and its restricted subsidiaries, including limitations on indebtedness, liens, restricted payments, restricted debt payments, investments, burdensome agreements, disposition of assets, transactions with affiliates, conduct of business and fundamental changes. The Term Loan does not include any financial maintenance covenants. The Revolver includes a financial maintenance covenant that requires, in certain circumstances tied to the usage of the Revolver and commenced with the second full fiscal quarter ended after September 27, 2024, compliance with a maximum first lien net leverage ratio of 5.25 to 1.00, stepping down to 5.00 to 1.00 commencing with the fifth full fiscal quarter ending after September 27, 2024. A breach of the financial maintenance covenant will only result in a default or event of default with respect to the Term Loan if the lenders under the Revolver have, as a result of such breach, demanded repayment of the obligations under the Revolver or otherwise accelerated such obligations (and terminated the commitments under the Revolver) and such demand or acceleration has not been rescinded.

The Credit Agreement contains customary events of default (with customary qualifications, exceptions, grace periods and notice provisions), including nonpayment of principal, interest, fees or other amounts, defaults under other agreements, breach of loan documents, breach of representations and warranties, voluntary and involuntary bankruptcy or appointment of receiver, unsatisfied judgments and attachments, certain ERISA events, change of control, invalidity of guaranties, collateral documents and other loan documents, and obligations ceasing to constitute senior indebtedness for purposes of certain subordinated indebtedness.

The obligations of Amentum and any borrowing subsidiaries under the Credit Agreement and certain designated cash management obligations, hedging obligations and ancillary services obligations, are unconditionally guaranteed on a senior basis (subject to customary exceptions) by, and secured by perfected first-priority security interests (subject to permitted liens

and other customary exceptions) in substantially all tangible and intangible assets of Amentum and its wholly owned material domestic restricted subsidiaries.

Senior Notes

In connection with the consummation of the Transaction, on August 13, 2024, the Company completed an offering of $1.0 billion in aggregate principal amount of 7.250% senior notes due August 1, 2032 (the “Senior Notes”). The proceeds of the notes offering were initially funded into escrow and released concurrently with the consummation of the merger. Interest on the Senior Notes accrues at the rate of 7.250% per annum and is payable on February 1 and August 1 of each year, which commenced on February 1, 2025.

The Senior Notes are governed by the terms of the indenture dated as of August 13, 2024 (the “Indenture”), among Amentum Holdings, Inc., the Guarantors (as defined below) and U.S. Bank Trust Company National Association, as trustee (the “Trustee”) and collateral agent (the “Collateral Agent”). The Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by (1) the Company, and (2) our wholly-owned domestic restricted subsidiaries that currently guarantee the Credit Facility (the “Guarantors”).

The Senior Notes have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), or the securities laws of any other jurisdiction. The Senior Notes may not be offered or sold in the United States or to U.S. persons (as defined in Regulation S) except in transactions exempt from, or not subject to, the registration requirements of the Securities Act. Accordingly, the Senior Notes were offered only to (1) “qualified institutional buyers” as defined in Rule 144A under the Securities Act and (2) outside the United States to non-U.S. persons in compliance with Regulation S under the Securities Act.

Covenants

The Indenture contains covenants that limit, among other things, our ability to:

•incur additional indebtedness;

•create liens or use assets as security in other transactions;

•make certain payments, including loans, advances or capital contributions;

•acquire capital stock, acquire all or substantially all of the assets of a division, line of business or other business unit;

•dispose of certain assets;

•make prepayments, redemptions and repurchases, more than one year prior to stated maturity, of certain debt; and

•engage in transactions with affiliates.

These covenants are subject to a number of important exceptions and qualifications as set forth in the Indenture.

Upon the occurrence of specific kinds of change of control events (unless we elect to redeem the Senior Notes at our option prior thereto), holders of Senior Notes will have the right to require us to repurchase some or all of the Senior Notes at 101% of their face amount, plus accrued and unpaid interest to the repurchase date.

Optional Redemption

The Senior Notes are redeemable at the option of the Company, in whole or in part, at any time and from time to time, upon not less than 30 nor more than 60 days’ prior notice.

At any time prior to August 1, 2027, we may, at our option and on one or more occasions, redeem all or a part of the Senior Notes, at a redemption price equal to 100.000% of the principal amount of the Senior Notes redeemed plus (i) a premium of either the highest of (a) 1.00% of the principal amount of the Senior Notes or (b) the United States Treasury Rate as of the redemption date plus 50 basis points, and (ii) accrued and unpaid interest.

At any time prior to August 1, 2027, we may, at our option and on one or more occasions, redeem up to 40.0% of the aggregate principal amount of the Senior Notes at a redemption price equal to (i) 107.250% of the aggregate principal amount, in an amount equal to or less than the amount of net cash proceeds from one or more equity offerings, as defined in the Indenture, to the extent such net cash proceeds are received by or contributed to the Company or a Guarantor, plus (ii) accrued and unpaid interest.

The Senior Notes may be redeemed at the following prices (expressed as a percentage of the principal amount), plus accrued and unpaid cash interest, if any, if redeemed during the 12-month period commencing on August 1 of the years set forth below:

Redemption date	Price
On or after August 1, 2027	103.625	%
On or after August 1, 2028	101.813	%
On August 1, 2029 and thereafter	100.000	%

Debt Maturity Schedule

Future principal maturities of the Company’s long-term debt as of October 3, 2025 are as follows:

Year Ending September 30,	(Amounts in millions)
2026	$	43
2027	39
2028	38
2029	38
2030	38
Thereafter	3,812
Total	$	4,008

Cash Flow Hedges

The Company utilizes derivative financial instruments to manage interest rate risk related to its variable rate debt. The Company’s objective is to manage its exposure to interest rate movements and reduce volatility of interest expense. The Company entered into several interest rate swaps with an aggregate notional value of $1.6 billion that were designated as cash flow hedges, in which the Company will pay at the fixed rate and receive payment at a floating rate indexed to the three-month term SOFR through maturity. The swaps mature at various dates through January 31, 2027. The change in fair value of the interest rate swaps is presented within accumulated other comprehensive income on our consolidated balance sheet and subsequently reclassified into interest expense and other, net on our consolidated statements of income and comprehensive loss in the period when the hedged transaction affects earnings. See Note 13 — Fair Value of Financial Assets and Liabilities and Note 17 — Accumulated Other Comprehensive Income (Loss) for additional information.