Amentum Holdings, Inc.

AMTM·NYSE·$22.91Share Price as of 11/2·$6BMarket Cap as of 11/2

Financials

10-QQ3 ended 07/03/2608/11/26 10-QQ2 ended 04/03/2605/12/26 10-QQ1 ended 01/02/2602/10/26 10-KFY 202511/25/25 10-QQ3 ended 06/27/2508/06/25

Disclosures

8-KCurrent report10/02/26 8-KCurrent report08/10/26 8-KCurrent report05/11/26 8-KCurrent report04/28/26 8-KCurrent report02/10/26

Prospectuses and Registrations

S-3ASRAutomatic shelf registration10/01/25 424B4Prospectus03/12/25 S-1Registration statement (IPO)03/10/25 S-8Registration of securities for employees11/08/24 S-8Registration of securities for employees10/04/24

Proxies

DEF 14ADefinitive proxy12/19/25 DEFA14AAdditional proxy materials12/19/25 DEF 14ADefinitive proxy01/21/25 DEFA14AAdditional proxy materials01/21/25

Ownership

Form 4Insider transaction09/17/26 SC 13GBeneficial ownership08/06/26 Form 4Insider transaction05/07/26 Form 4Insider transaction05/07/26 Form 4Insider transaction05/07/26

Other

ARSAnnual report to shareholders12/19/25 EFFECTRequest for effectiveness03/11/25 CORRESPCorrespondence with the SEC03/10/25 CORRESPCorrespondence with the SEC03/10/25 UPLOADLetter from the SEC01/24/25