Amentum Holdings, Inc. (AMTM) — Institutional Holders, Q2 2026

466 institutional investment managers reported a AMTM position on SEC Form 13F-HR for the quarter ended June 30, 2026, with a combined reported value of $4.3B. Every filer is listed below, ranked by position value, 100 per page; this page shows ranks 1 to 100. Put and call option positions are excluded, and a firm filing several lots or share classes is shown once with its total.

← AMTM stock profile

AMTM in Q2 2026: what funds did

Funds that filed a 13F for both Q1 2026 and Q2 2026, by what they did with the common stock. Share counts are adjusted for any split between the two quarters; dollar figures are the change in shares at this quarter’s price.

New positions

Added to

148

Trimmed

160

Sold out

Biggest buyers

Invesco Ltd.Added · +3,480,473 sh+$71.9M
Troluce Capital AdvisorsAdded · +2,565,399 sh+$53.0M
DIMENSIONAL FUND ADVISORSAdded · +1,750,276 sh+$36.2M
GOLDMAN SACHS GROUPAdded · +1,580,428 sh+$32.7M
MILLENNIUM MANAGEMENTAdded · +1,496,724 sh+$30.9M

Biggest sellers

Focus Partners WealthTrimmed · -2,466,567 sh-$51.0M
Arvin Capital ManagementTrimmed · -1,654,495 sh-$34.2M
TORONTO DOMINION BANKSold out · -1,565,223 sh-$32.4M
BRIGHTLINE CAPITAL MANAGEMENTSold out · -1,396,000 sh-$28.9M
Ruane, Cunniff & Goldfarb L.P.Trimmed · -1,085,769 sh-$22.4M

AMTM 13F holders ranked 1–100 of 466

Institutional investors reporting a position in Amentum Holdings, Inc. on SEC Form 13F-HR for Q2 2026, ranked by reported value.
#	Institution	Shares	Value	% of portfolio	QoQShares vs Q1 2026
1	AMERICAN SECURITIES#1 · 45,026,743 sh	45,026,743	$930.7M	24.79%	0.0%
2	Invesco Ltd.#2 · 24,954,251 sh	24,954,251	$515.8M	0.04%	+16.2%
3	BlackRock#3 · 17,906,984 sh	17,906,984	$370.1M	<0.01%	+0.4%
4	PRIMECAP MANAGEMENT#4 · 12,285,504 sh	12,285,504	$253.9M	0.15%	+1.7%
5	VANGUARD PORTFOLIO MANAGEMENT#5 · 7,948,385 sh	7,948,385	$164.3M	<0.01%	+1.2%
6	VANGUARD CAPITAL MANAGEMENT#6 · 6,711,987 sh	6,711,987	$138.7M	<0.01%	+0.9%
7	FMR#7 · 5,679,175 sh	5,679,175	$117.4M	<0.01%	+1.8%
8	DIMENSIONAL FUND ADVISORS#8 · 5,537,696 sh	5,537,696	$114.5M	0.02%	+46.2%
9	STATE STREET#9 · 5,151,772 sh	5,151,772	$106.5M	<0.01%	+1.4%
10	FRONTIER CAPITAL MANAGEMENT#10 · 4,143,971 sh	4,143,971	$85.7M	0.80%	-15.9%
11	Troluce Capital Advisors#11 · 3,565,399 sh	3,565,399	$73.7M	7.59%	+256.5%
12	GEODE CAPITAL MANAGEMENT#12 · 2,716,560 sh	2,716,560	$56.2M	<0.01%	-3.5%
13	GOLDMAN SACHS GROUP#13 · 2,711,866 sh	2,711,866	$56.1M	<0.01%	+139.7%
14	MORGAN STANLEY#14 · 2,662,329 sh	2,662,329	$55.0M	<0.01%	+19.1%
15	MIRAE ASSET GLOBAL ETFS Ltd.#15 · 2,318,581 sh	2,318,581	$47.9M	0.06%	-16.8%
16	THOMPSON SIEGEL & WALMSLEY#16 · 2,281,945 sh	2,281,945	$47.2M	0.85%	+49.5%
17	MILLENNIUM MANAGEMENT#17 · 2,127,779 sh	2,127,779	$44.0M	0.02%	+237.2%
18	CHARLES SCHWAB INVESTMENT MANAGEMENT#18 · 2,120,102 sh	2,120,102	$43.8M	<0.01%	+2.5%
19	THRIVENT FINANCIAL FOR LUTHERANS#19 · 2,105,802 sh	2,105,802	$43.5M	0.07%	+0.3%
20	BANK OF AMERICA#20 · 2,042,897 sh	2,042,897	$42.2M	<0.01%	-15.1%
21	SEGRA CAPITAL MANAGEMENT#21 · 2,037,890 sh	2,037,890	$42.1M	—	+26.4%
22	Verition Fund Management#22 · 2,019,334 sh	2,019,334	$41.7M	0.06%	+55.6%
23	VAN ECK ASSOCIATES#23 · 1,988,898 sh	1,988,898	$41.1M	0.03%	+263.2%
24	VOYA INVESTMENT MANAGEMENT#24 · 1,974,191 sh	1,974,191	$40.8M	0.04%	+64.6%
25	UBS Group AG#25 · 1,545,183 sh	1,545,183	$31.9M	<0.01%	-9.7%
26	NORGES BANK#26 · 1,516,193 sh	1,516,193	$31.3M	<0.01%	—
27	Permian Investment Partners#27 · 1,433,028 sh	1,433,028	$29.6M	3.25%	-8.5%
28	683 Capital Management#28 · 1,100,000 sh	1,100,000	$22.7M	1.12%	+41.9%
29	LOOMIS SAYLES & L P#29 · 1,042,522 sh	1,042,522	$21.5M	0.03%	-3.6%
30	Qube Research & Technologies Ltd#30 · 1,034,395 sh	1,034,395	$21.4M	0.02%	+1237.0%
31	NORTHERN#31 · 1,029,892 sh	1,029,892	$21.3M	<0.01%	+4.7%
32	VANGUARD FIDUCIARY#32 · 968,451 sh	968,451	$20.0M	<0.01%	+2.2%
33	CACTI ASSET MANAGEMENT#33 · 881,692 sh	881,692	$18.2M	—	0.0%
34	Bank of New York Mellon#34 · 878,084 sh	878,084	$18.2M	<0.01%	-3.4%
35	Russell Investments Group, Ltd.#35 · 840,642 sh	840,642	$17.4M	0.02%	+17.8%
36	AVENIR#36 · 811,726 sh	811,726	$16.8M	2.04%	-3.5%
37	WELLS FARGO & COMPANY#37 · 750,214 sh	750,214	$15.5M	<0.01%	+17.8%
38	PRINCIPAL FINANCIAL GROUP#38 · 742,381 sh	742,381	$15.3M	<0.01%	-0.3%
39	Ancora Advisors#39 · 715,652 sh	715,652	$14.8M	0.28%	+1.8%
40	ROYCE & ASSOCIATES#40 · 697,368 sh	697,368	$14.4M	0.12%	+26.8%
41	HRT FINANCIAL#41 · 671,847 sh	671,847	$13.9M	0.03%	New
42	CITADEL ADVISORS#42 · 670,684 sh	670,684	$13.9M	<0.01%	+731.7%
43	Point72 Asset Management, L.P.#43 · 649,984 sh	649,984	$13.4M	0.01%	-60.1%
44	AQR CAPITAL MANAGEMENT#44 · 601,900 sh	601,900	$12.4M	<0.01%	+18.5%
45	FIRST ADVISORS#45 · 547,907 sh	547,907	$11.3M	<0.01%	+140.2%
46	Ruane, Cunniff & Goldfarb L.P.#46 · 537,213 sh	537,213	$11.1M	0.17%	-66.9%
47	PUBLIC SECTOR PENSION INVESTMENT BOARD#47 · 528,821 sh	528,821	$10.9M	0.03%	-3.8%
48	LOEWS#48 · 500,000 sh	500,000	$10.3M	0.08%	New
49	SHAPIRO CAPITAL MANAGEMENT#49 · 475,970 sh	475,970	$9.8M	0.60%	New
50	FIRST NATIONAL BANK OF OMAHA#50 · 475,992 sh	475,992	$9.7M	0.27%	+91.9%
51	Legacy Advisors#51 · 9,065,677 sh	9,065,677	$9.1M	—	0.0%
52	Nuveen#52 · 421,495 sh	421,495	$8.7M	<0.01%	-51.7%
53	Arvin Capital Management#53 · 416,705 sh	416,705	$8.6M	1.12%	-79.9%
54	HOTCHKIS & WILEY CAPITAL MANAGEMENT#54 · 402,130 sh	402,130	$8.3M	0.02%	+20.5%
55	SUSQUEHANNA FUNDAMENTAL INVESTMENTS#55 · 394,370 sh	394,370	$8.2M	0.15%	+81.1%
56	BOOTHBAY FUND MANAGEMENT#56 · 387,973 sh	387,973	$8.0M	0.11%	+350.1%
57	De Lisle Partners LLP#57 · 374,818 sh	374,818	$7.7M	0.84%	-1.3%
58	Vident Advisory#58 · 372,918 sh	372,918	$7.7M	0.06%	-4.1%
59	Mawer Investment Management Ltd.#59 · 369,557 sh	369,557	$7.6M	0.05%	+10.7%
60	MOORE CAPITAL MANAGEMENT#60 · 365,096 sh	365,096	$7.5M	0.11%	-58.2%
61	Legal & General Group Plc#61 · 349,048 sh	349,048	$7.2M	<0.01%	+4.2%
62	JANE STREET GROUP#62 · 343,687 sh	343,687	$7.1M	<0.01%	+79.0%
63	SUSQUEHANNA INTERNATIONAL GROUP, LLP#63 · 332,452 sh	332,452	$6.9M	<0.01%	+0.7%
64	CenterBook Partners#64 · 328,766 sh	328,766	$6.8M	0.33%	+128.8%
65	AMERIPRISE FINANCIAL#65 · 319,479 sh	319,479	$6.6M	<0.01%	-3.1%
66	GRIZZLYROCK CAPITAL#66 · 318,363 sh	318,363	$6.6M	4.60%	+10.1%
67	Swiss National Bank#67 · 318,091 sh	318,091	$6.6M	<0.01%	+1.5%
68	Rovida Investment Management Ltd#68 · 315,000 sh	315,000	$6.5M	0.44%	0.0%
69	Aristotle Capital Boston#69 · 307,836 sh	307,836	$6.4M	0.43%	-10.8%
70	EXCHANGE TRADED CONCEPTS#70 · 305,286 sh	305,286	$6.3M	0.03%	+3.5%
71	TWO SIGMA INVESTMENTS#71 · 284,268 sh	284,268	$5.9M	<0.01%	-68.4%
72	RHUMBLINE ADVISERS#72 · 284,060 sh	284,060	$5.9M	<0.01%	-5.4%
73	FIFTH THIRD BANCORP#73 · 281,815 sh	281,815	$5.8M	<0.01%	+3.1%
74	CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM#74 · 266,383 sh	266,383	$5.5M	<0.01%	-3.9%
75	SG Americas Securities#75 · 262,993 sh	262,993	$5.4M	<0.01%	-4.2%
76	Hudson Value Partners#76 · 250,185 sh	250,185	$5.2M	1.30%	+22.7%
77	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AME#77 · 249,725 sh	249,725	$5.2M	<0.01%	+0.7%
78	CSM Advisors#78 · 243,814 sh	243,814	$5.0M	0.11%	+200.1%
79	AWH Capital, L.P.#79 · 235,250 sh	235,250	$4.9M	3.41%	0.0%
80	ExodusPoint Capital Management#80 · 226,289 sh	226,289	$4.7M	0.03%	New
81	RAYMOND JAMES FINANCIAL#81 · 224,399 sh	224,399	$4.6M	<0.01%	-8.7%
82	Hel Ved Capital Management Ltd#82 · 214,000 sh	214,000	$4.4M	0.33%	+19.9%
83	D. E. Shaw#83 · 191,488 sh	191,488	$4.0M	<0.01%	+189.4%
84	SEI INVESTMENTS#84 · 190,069 sh	190,069	$3.9M	<0.01%	-35.5%
85	WEDGE CAPITAL MANAGEMENT L L P#85 · 187,832 sh	187,832	$3.9M	—	+14.1%
86	Verbena Value#86 · 186,200 sh	186,200	$3.8M	0.64%	New
87	Telos Capital Management#87 · 185,611 sh	185,611	$3.8M	0.34%	-2.3%
88	North Growth Management Ltd.#88 · 173,000 sh	173,000	$3.6M	—	+0.6%
89	OpenArc Corporate Advisory#89 · 170,291 sh	170,291	$3.5M	—	0.0%
90	Brevan Howard Capital Management#90 · 167,354 sh	167,354	$3.5M	0.03%	+116.8%
91	NEW YORK STATE TEACHERS RETIREMENT SYSTEM#91 · 161,992 sh	161,992	$3.3M	—	-2.0%
92	Atom Investors#92 · 160,876 sh	160,876	$3.3M	0.30%	+605.1%
93	Gotham Asset Management#93 · 156,113 sh	156,113	$3.2M	<0.01%	-70.0%
94	PRICE T ROWE ASSOCIATES#94 · 152,081 sh	152,081	$3.1M	<0.01%	+4.7%
95	BARCLAYS PLC#95 · 151,780 sh	151,780	$3.1M	<0.01%	+224.2%
96	Soviero Asset Management#96 · 150,000 sh	150,000	$3.1M	1.30%	-37.5%
97	OPPENHEIMER#97 · 142,974 sh	142,974	$3.0M	—	-15.3%
98	Bryn Mawr Advisors#98 · 141,443 sh	141,443	$2.9M	0.13%	+21.0%
99	PRUDENTIAL FINANCIAL#99 · 139,950 sh	139,950	$2.9M	<0.01%	-0.3%
100	Focus Partners Wealth#100 · 138,344 sh	138,344	$2.9M	<0.01%	-94.7%

Funds that sold out of AMTM in Q2 2026 (74)

Held AMTM at the end of Q1 2026 and filed a Q2 2026 13F without it. Not in the list above, because they no longer hold it. Largest prior position first.

Institutions that held AMTM in Q1 2026 and reported no position in Q2 2026.
Institution	Shares sold	Value in Q1 2026
TORONTO DOMINION BANK1,565,223 sh	1,565,223	$40.8M
BRIGHTLINE CAPITAL MANAGEMENT1,396,000 sh	1,396,000	$36.4M
COOPER CREEK PARTNERS MANAGEMENT929,334 sh	929,334	$24.2M
Penn Capital Management Company694,352 sh	694,352	$18.2M
CI INVESTMENTS420,068 sh	420,068	$11.0M
Hyperion Capital Advisors303,576 sh	303,576	$7.9M
Oak Thistle71,759 sh	71,759	$1.9M
K2 PRINCIPAL FUND, L.P.60,000 sh	60,000	$1.6M
Marex Group plc53,043 sh	53,043	$1.4M
MIRABELLA FINANCIAL SERVICES LLP52,498 sh	52,498	$1.4M
MAVERICK CAPITAL LTD46,335 sh	46,335	$1.2M
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.40,393 sh	40,393	$1.1M
Walleye Trading28,548 sh	28,548	$744.5K
STIFEL FINANCIAL21,935 sh	21,935	$572.1K
Massar Capital Management21,056 sh	21,056	$549.1K
ARISTEIA CAPITAL, L.L.C.20,605 sh	20,605	$537.4K
ALLSTATE19,471 sh	19,471	$507.8K
Modera Wealth Management18,402 sh	18,402	$479.9K
EntryPoint Capital17,978 sh	17,978	$468.9K
AIGEN INVESTMENT MANAGEMENT16,916 sh	16,916	$441.2K
MACKENZIE FINANCIAL16,270 sh	16,270	$424.3K
BCS Private Wealth Management14,624 sh	14,624	$381.4K
DAVENPORT13,558 sh	13,558	$353.6K
Lighthouse Investment Partners12,099 sh	12,099	$315.5K
CANADA PENSION PLAN INVESTMENT BOARD11,594 sh	11,594	$302.4K
Caldwell Investment Management Ltd.11,669 sh	11,669	$294.1K
BROWN ADVISORY9,928 sh	9,928	$258.9K
M&T BANK9,575 sh	9,575	$249.7K
IHT Wealth Management9,537 sh	9,537	$248.7K
DRW Securities9,412 sh	9,412	$245.5K
EVERGREEN CAPITAL MANAGEMENT9,103 sh	9,103	$237.4K
Vann Equity Management9,018 sh	9,018	$235.2K
SYON CAPITAL8,814 sh	8,814	$229.9K
SILVERCREST ASSET MANAGEMENT GROUP8,515 sh	8,515	$222.1K
ALPINE WOODS CAPITAL INVESTORS8,402 sh	8,402	$219.1K
Utah Retirement Systems8,339 sh	8,339	$217.5K
Badgley Phelps Wealth Managers8,038 sh	8,038	$209.6K
Empowered Funds7,900 sh	7,900	$206.0K
Strategic Equity Management7,844 sh	7,844	$204.6K
Caprock Group7,842 sh	7,842	$204.5K
MAI Capital Management6,094 sh	6,094	$158.9K
ACADIAN ASSET MANAGEMENT5,957 sh	5,957	$155.0K
PEAK62,783 sh	2,783	$72.6K
NOMURA ASSET MANAGEMENT LTD2,700 sh	2,700	$70.4K
Advisory Services Network2,586 sh	2,586	$67.4K
Sound Income Strategies1,361 sh	1,361	$35.8K
Western Wealth Management1,252 sh	1,252	$32.7K
Spire Wealth Management846 sh	846	$22.1K
Root Financial Partners773 sh	773	$20.2K
First Command Advisory Services695 sh	695	$18.1K
MBM WEALTH CONSULTANTS678 sh	678	$17.7K
Global Wealth Strategies & Associates493 sh	493	$12.9K
Golden State Equity Partners357 sh	357	$9.3K
TWIN PEAKS WEALTH ADVISORS339 sh	339	$8.8K
DT Investment Partners230 sh	230	$6.0K
Intentional Wealth Strategies210 sh	210	$5.5K
Medallion Wealth Advisors180 sh	180	$4.7K
Cassaday & Wealth Management164 sh	164	$4.3K
BAYBAN81 sh	81	$2.1K
Meramec Financial Planners61 sh	61	$1.7K
Aventus Investment Advisors59 sh	59	$1.5K
Synergy Investment Management52 sh	52	$1.4K
Clayton Financial Group27 sh	27	$705.00
Cornerstone Financial Management16 sh	16	$417.00
Hilltop National Bank15 sh	15	$391.00
NBT BANK N A12 sh	12	$313.00
Vermillion Wealth Management11 sh	11	$287.00
Annis Gardner Whiting Capital Advisors10 sh	10	$261.00
KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT8 sh	8	$209.00
SHP Wealth Management5 sh	5	$130.00
Signature Equity Partners2 sh	2	$52.00
Lloyd Advisory Services1 sh	1	$26.00
Scarborough Advisors1 sh	1	$26.00
Kingdom Financial Group1 sh	1	$26.00

Source: Form 13F-HR filings on SEC EDGAR, Q2 2026. Values are as reported by each manager at quarter end. “% of portfolio” is the position’s share of the manager’s total reported 13F value for the same quarter. “New” means the manager filed a 13F for Q1 2026 without this position; a dash means no comparison is available. Where a manager’s own filing is internally inconsistent its value is withheld and it is listed last. 13F data shows reported holdings, not recommendations.