Stocks
AMTM Amentum Holdings, Inc.

AMTM

Amentum Holdings, Inc.

Company with tickers: AMTM

CIK

2011286

CUSIP

023939101

Shares Outstanding

243,935,176

Price Holdings Short Volume Short Interest Fails to Deliver SEC Filings Earnings Calls Insider Trading Congress Trades

Date	Insider	Role	Type	Shares	Price	Value	After
2026-03-04	Bruning Jill L	Chief Technology Officer	Gift	30,000	—	—	190,999
2026-03-02	Arnette Stephen A	Chief Operating Officer	Convert	2,808	—	—	97,107
2026-03-02	Arnette Stephen A	Chief Operating Officer	Tax	750	$30.70	$23,025	96,357
2026-03-02	Arnette Stephen A	Chief Operating Officer	Convert	2,808	—	—	0
2026-02-17	St. Mary Michele T	Chief Legal Officer & GC	Convert	7,080	—	—	29,351
2026-02-17	St. Mary Michele T	Chief Legal Officer & GC	Tax	2,308	$30.05	$69,355	27,043
2026-02-17	St. Mary Michele T	Chief Legal Officer & GC	Convert	7,080	—	—	14,162
2026-02-06	IRELAND SUSAN LESLIE	Director	Award	5,062	—	—	8,509
2026-02-06	Rowland Sandra E.	Director	Award	5,062	—	—	20,073
2026-02-06	Rowland Sandra E.	Director	Convert	11,564	—	—	15,011
2026-02-06	Rowland Sandra E.	Director	Convert	11,564	—	—	0
2026-02-06	Brooks Vincent K	Director	Award	5,062	—	—	27,462
2026-02-06	Brooks Vincent K	Director	Convert	11,564	—	—	0
2026-02-06	Brooks Vincent K	Director	Convert	11,564	—	—	22,400
2026-02-06	EBERHART RALPH E	Director	Award	5,062	—	—	48,120
2026-02-06	EBERHART RALPH E	Director	Convert	11,564	—	—	0
2026-02-06	EBERHART RALPH E	Director	Convert	11,564	—	—	43,058
2026-02-06	Loughran Barbara	Director	Award	5,062	—	—	9,662
2026-02-06	Thompson Christopher M.T.	Director	Award	5,062	—	—	5,062
2026-02-06	Thompson Christopher M.T.	Director	Other	14,000	—	—	14,000
2026-02-06	Vollmer John C.	Director	Award	5,062	—	—	429,842
2026-02-06	Vollmer John C.	Director	Convert	11,564	—	—	424,780
2026-02-06	Vollmer John C.	Director	Convert	11,564	—	—	0
2026-01-28	Heller John E.	Director, Chief Executive Officer	Convert	51,979	—	—	385,826
2026-01-28	Heller John E.	Director, Chief Executive Officer	Convert	51,979	—	—	103,959
2026-01-28	Heller John E.	Director, Chief Executive Officer	Tax	19,768	$35.71	$705,915	366,058
2025-12-17	Mullen Sean Thomas	Chief Growth Officer	Convert	9,298	—	—	0
2025-12-17	Mullen Sean Thomas	Chief Growth Officer	Convert	9,298	—	—	30,332
2025-12-17	Mullen Sean Thomas	Chief Growth Officer	Tax	4,194	$28.67	$120,242	26,138
2025-12-05	Burton Darren	Chief People Officer	Convert	2,721	—	—	24,992
2025-12-05	Burton Darren	Chief People Officer	Tax	1,392	$28.88	$40,201	23,600
2025-12-05	Burton Darren	Chief People Officer	Convert	2,721	—	—	5,444
2025-11-17	Heller John E.	Director, Chief Executive Officer	Award	155,897	—	—	269,440
2025-11-17	Burton Darren	Chief People Officer	Award	22,271	—	—	22,271
2025-11-17	Johnson Travis Barton	Chief Financial Officer	Award	100,220	—	—	108,675
2025-11-17	St. Mary Michele T	Chief Legal Officer & GC	Award	22,271	—	—	22,271
2025-11-17	DEMETRIOU STEVEN J.	Director	Other	23,550	—	—	23,550
2025-11-17	DEMETRIOU STEVEN J.	Director	Tax	17,077	$21.49	$366,985	709,121
2025-11-17	DEMETRIOU STEVEN J.	Director	Convert	43,396	—	—	0
2025-11-17	DEMETRIOU STEVEN J.	Director	Award	111,355	—	—	820,476
2025-11-17	DEMETRIOU STEVEN J.	Director	Convert	43,396	—	—	726,198
2025-11-17	Mullen Sean Thomas	Chief Growth Officer	Award	17,817	—	—	21,034
2025-11-17	Bruning Jill L	Chief Technology Officer	Award	17,817	—	—	21,198
2025-11-17	Arnette Stephen A	Chief Operating Officer	Tax	287	$21.49	$6,168	46,956
2025-11-17	Arnette Stephen A	Chief Operating Officer	Award	46,769	—	—	93,725
2025-11-17	Arnette Stephen A	Chief Operating Officer	Convert	1,178	—	—	47,243
2025-11-17	Arnette Stephen A	Chief Operating Officer	Convert	1,178	—	—	0
2025-11-16	Arnette Stephen A	Chief Operating Officer	Convert	5,053	—	—	5,053
2025-11-16	Arnette Stephen A	Chief Operating Officer	Tax	1,231	$22.07	$27,168	39,805
2025-11-16	Arnette Stephen A	Chief Operating Officer	Convert	5,053	—	—	41,036
2025-11-15	Arnette Stephen A	Chief Operating Officer	Tax	1,403	$22.07	$30,964	35,983
2025-11-15	Arnette Stephen A	Chief Operating Officer	Convert	5,758	—	—	11,515
2025-11-15	Arnette Stephen A	Chief Operating Officer	Convert	5,758	—	—	37,386
2025-11-06	Bruning Jill L	Chief Technology Officer	Convert	4,838	—	—	9,678
2025-11-06	Bruning Jill L	Chief Technology Officer	Convert	4,838	—	—	4,838
2025-11-06	Bruning Jill L	Chief Technology Officer	Tax	1,457	$21.79	$31,748	3,381
2025-11-06	Heller John E.	Director, Chief Executive Officer	Tax	17,868	$21.79	$389,344	113,543
2025-11-06	Heller John E.	Director, Chief Executive Officer	Convert	39,617	—	—	131,411
2025-11-06	Heller John E.	Director, Chief Executive Officer	Convert	39,617	—	—	79,236
2025-11-06	Mullen Sean Thomas	Chief Growth Officer	Convert	4,838	—	—	9,678
2025-11-06	Mullen Sean Thomas	Chief Growth Officer	Tax	1,621	$21.79	$35,322	3,217
2025-11-06	Mullen Sean Thomas	Chief Growth Officer	Convert	4,838	—	—	4,838
2025-11-06	Johnson Travis Barton	Chief Financial Officer	Convert	12,097	—	—	12,097
2025-11-06	Johnson Travis Barton	Chief Financial Officer	Convert	12,097	—	—	24,194
2025-11-06	Johnson Travis Barton	Chief Financial Officer	Tax	3,642	$21.79	$79,359	8,455
2025-11-06	DEMETRIOU STEVEN J.	Director	Tax	28,818	$21.79	$627,944	682,802
2025-11-06	DEMETRIOU STEVEN J.	Director	Convert	90,727	—	—	0
2025-11-06	DEMETRIOU STEVEN J.	Director	Convert	90,727	—	—	711,620
2025-11-06	DEMETRIOU STEVEN J.	Director	Other	23,550	—	—	23,550
2025-11-06	Arnette Stephen A	Chief Operating Officer	Convert	12,701	—	—	25,404
2025-11-06	Arnette Stephen A	Chief Operating Officer	Convert	12,701	—	—	34,721
2025-11-06	Arnette Stephen A	Chief Operating Officer	Tax	3,093	$21.79	$67,396	31,628
2025-05-08	GOLDBERG ALAN E	Director, 10% Owner	Other	1,132,839	—	—	45,026,743
2025-05-08	Goldberg 2014 LLC	10% Owner	Other	1,132,839	—	—	45,026,743
2025-05-08	Lindsay Goldberg Employee Co-Inv. IV L.P.	10% Owner	Other	1,132,839	—	—	45,026,743
2025-05-08	Amentum Joint Venture GP LLC	Director	Other	2,433,022	—	—	0
2025-04-08	Vollmer John C.	Director	Award	11,564	—	—	11,564
2025-04-08	Brooks Vincent K	Director	Award	11,564	—	—	11,564
2025-04-08	Thompson Christopher M.T.	Director	Award	11,564	—	—	11,564
2025-04-08	EBERHART RALPH E	Director	Award	11,564	—	—	11,564
2025-04-08	Loughran Barbara	Director	Award	11,564	—	—	11,564
2025-04-08	IRELAND SUSAN LESLIE	Director	Award	11,564	—	—	11,564
2025-04-08	Rowland Sandra E.	Director	Award	11,564	—	—	11,564
2025-04-07	Amentum Joint Venture GP LLC	Director	Award	2,433,022	—	—	2,433,022
2025-03-17	St. Mary Michele T	Chief Legal Officer & GC	Award	21,242	—	—	21,242
2025-03-13	JACOBS SOLUTIONS INC.	10% Owner	Other	19,464,174	—	—	0
2025-03-05	Vollmer John C.	Director	Convert	3,447	—	—	0
2025-03-05	Vollmer John C.	Director	Convert	3,447	—	—	394,788
2025-03-05	IRELAND SUSAN LESLIE	Director	Convert	3,447	—	—	3,447
2025-03-05	IRELAND SUSAN LESLIE	Director	Convert	3,447	—	—	0
2025-03-05	Brooks Vincent K	Director	Convert	3,447	—	—	10,413
2025-03-05	Brooks Vincent K	Director	Convert	3,447	—	—	0
2025-03-05	Rowland Sandra E.	Director	Convert	3,447	—	—	3,447
2025-03-05	Rowland Sandra E.	Director	Convert	3,447	—	—	0
2025-03-05	EBERHART RALPH E	Director	Convert	3,447	—	—	0
2025-03-05	EBERHART RALPH E	Director	Convert	3,447	—	—	29,886
2025-03-04	Arnette Stephen A	Chief Operating Officer	Convert	521	—	—	0
2025-03-04	Arnette Stephen A	Chief Operating Officer	Convert	521	—	—	22,172
2025-03-04	Arnette Stephen A	Chief Operating Officer	Tax	152	$18.71	$2,844	22,020
2025-03-03	Arnette Stephen A	Chief Operating Officer	Tax	365	$19.64	$7,169	21,651