Amentum Holdings Inc 2023年度报告

FORM 10-K (Mark One)ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended September 27, 2024 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THESECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-42176 Amentum Holdings, Inc. (Exact name of registrant as specified in its charter) Delaware (State or other jurisdiction of(I.R.S. Employerincorporation or organization)Identification No.)4800 Westfields Blvd., Suite #400Chantilly, Virginia 20151(Address principal executive offices) (703) 579-0410(Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the Registrant is a well-known seasoned issuer, as defined in Rule 405of the Securities Act. Yes o. No þ. Indicate by check mark whether the Registrant is not required to file reports pursuant to Section 13 orSection 15(d) of the Act. Yes o. No þ.1 Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorterperiod that the Registrant was required to file such reports), and (2) has been subject to such filingrequirements for the past 90 days.Yes o. No þ. Indicate by check mark whether the registrant has submitted electronically every Interactive Data Filerequired to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during thepreceding12 months(or for such shorter period that the registrant was required to submit suchfiles). Yes þ. No o. Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company, or an emerging growth company. See the definitions of“large accelerated filer,” “accelerated filer” and “smaller reporting company,” and “emerging growthcompany” in Rule 12b-2 of the Exchange Act. Large accelerated fileroNon-accelerated filerþ Accelerated fileroSmaller reporting companyoEmerging growth companyo If an emerging growth company, indicate by check mark if the Registrant has elected not to use theextended transition period for complying with any new or revised financial accounting standards providedpursuant to Section 13(a) of the Exchange Act. o. Indicate by check mark whether the registrant has filed a report on and attestation to its management’sassessment of the effectiveness of its internal control over financial reporting under Section 404(b) of theSarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issuedits audit report. o. If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether thefinancial statements of the registrant included in the filing reflect the correction of an error to previouslyissued financial statements. o. Indicate by check mark whether any of those error corrections are restatements that required a recoveryanalysis of incentive-based compensation received by any of the registrant’s executive officers during therelevant recovery period pursuant to §240.10D-1(b). o. Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of theExchange Act). Yes o. No þ. The aggregate market value of common shares held by non-affiliates of the Registrant on December 6,2024 was $5,637,313,295, based upon the closing price of the Registrant’s common shares as quoted onthe New York Stock Exchange composite tape on such date. As of December 6, 2024, there were 243,302,257 shares outstanding of Amentum Holdings, Inc. commonstock, par value of $0.01 per share. 2 DOCUMENTS INCORPORATED BY REFERENCE Part III of this Form 10-K incorporates by reference certain information from the Registrant’s ProxyStatement to be filed with the Securities Exchange Commission (SEC) pursuant to Regulation 14A for the2025 Annual Meeting of Stockholders. INFORMATION RELATING TO FORWARD-LOOKING STATEMENTS Certain information included or incorporated by reference in this Annual Report on Form 10-K may notaddress historical facts and, therefore, could be interpreted to be “forward-looking statements” as thatterm is defined in the Private Securities Litigation Reform Act of 1995 and other federal securities laws.All statements other than statements of historical fact are statements that could be deemed forward-looking statements, including projections of financial performance; statements of plans, strategies andobjectives of management for future operations; any statement concerning developments, performance orindustry rankings relating to products or services; any statements regarding future economic conditions orperformance; any statements of assumptions underlying any of the foregoing; and any other statementsthat address activities, events or developments that the Company intends, expe