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AMTM · Amentum Holdings, Inc.

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$22.55 +0.54 (+2.45%) At close · Jul 24
Market Cap
$5.51B
Shares
244.32M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 487
Total Value: $5,363,499,563
Total Shares: 208,234,008
Showing 1–100 of 511 holdings by value · page 1 of 6

Institutional Ownership Trend

8 quarters

Superinvestors Holding AMTM

All superinvestors →
Ruane Cunniff $42,327,370 Joel Greenblatt $13,588,749 George Soros $2,806,364 Mario Gabelli $2,486,232 Ray Dalio $444,716

Holder Concentration

Across 489 13F filers
Top Holder
21.6%
Sep 2024 → Mar 2026 · range 14.0% – 25.6%
of institutional value
Top 5
50.7%
Sep 2024 → Mar 2026 · range 43.2% – 57.8%
of institutional value
Top 10
63.2%
Sep 2024 → Mar 2026 · range 57.5% – 70.1%
of institutional value
HHI
756
Sep 2024 → Mar 2026 · range 483 – 977
Broadly held
Showing 100 of 511
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mid AMERICAN SECURITIES LLC Broker-Dealer $1,174,297,457 21.89% 45,026,743
Mega Invesco Ltd. $560,036,126 10.44% 21,473,778
Mega BlackRock, Inc. $465,300,653 8.68% 17,841,283
Mega PRIMECAP MANAGEMENT CO/CA/ $315,184,467 5.88% 12,085,294
Small Legacy Advisors, LLC $187,387,543 3.49% 9,065,677
Mega VANGUARD CAPITAL MANAGEMENT LLC $173,454,924 3.23% 6,650,879
Mega FMR LLC $145,484,305 2.71% 5,578,386
Mega STATE STREET CORP $132,461,389 2.47% 5,079,041
Mid FRONTIER CAPITAL MANAGEMENT CO LLC $128,579,876 2.40% 4,930,210
Mega DIMENSIONAL FUND ADVISORS LP $98,775,912 1.84% 3,787,420
Mega GEODE CAPITAL MANAGEMENT, LLC $73,399,942 1.37% 2,814,415
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $72,636,294 1.35% 2,785,134
Large Focus Partners Wealth $67,936,078 1.27% 2,604,911
Mega BANK OF AMERICA CORP /DE/ Bank $62,723,466 1.17% 2,405,041
Mega MORGAN STANLEY $58,286,524 1.09% 2,234,913
Large Thrivent Financial for Lutherans $54,779,918 1.02% 2,100,457
Small Arvin Capital Management LP $54,016,896 1.01% 2,071,200
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $53,931,614 1.01% 2,067,930
Mega UBS Group AG $44,617,010 0.83% 1,710,775
Large Point72 Asset Management, L.P. $42,525,083 0.79% 1,630,563
Mid Ruane, Cunniff & Goldfarb L.P. $42,327,370 0.79% 1,622,982
Small SEGRA CAPITAL MANAGEMENT, LLC $42,059,894 0.78% 1,612,726
Small Permian Investment Partners, LP $40,867,360 0.76% 1,567,000
Large TORONTO DOMINION BANK Bank $40,821,015 0.76% 1,565,223
Mid THOMPSON SIEGEL & WALMSLEY LLC $39,795,054 0.74% 1,525,884
Small BRIGHTLINE CAPITAL MANAGEMENT, LLC $36,407,680 0.68% 1,396,000
Large Verition Fund Management LLC $33,850,431 0.63% 1,297,946
Large VOYA INVESTMENT MANAGEMENT LLC $31,282,724 0.58% 1,199,491
Mega GOLDMAN SACHS GROUP INC $29,507,902 0.55% 1,131,438
Large LOOMIS SAYLES & CO L P $28,201,242 0.53% 1,081,336
Small Troluce Capital Advisors LLC $26,080,000 0.49% 1,000,000
Mega NORTHERN TRUST CORP Bank $25,665,456 0.48% 984,105
Large Caption Management, LLC $25,065,488 0.47% 961,100
Mega VANGUARD FIDUCIARY TRUST CO Bank $24,709,756 0.46% 947,460
Mid COOPER CREEK PARTNERS MANAGEMENT LLC $24,237,030 0.45% 929,334
Mega Bank of New York Mellon Corp Bank $23,696,255 0.44% 908,599
Mega TWO SIGMA INVESTMENTS, LP $23,476,616 0.44% 900,177
Mid MOORE CAPITAL MANAGEMENT, LP $22,783,748 0.42% 873,610
Mega Nuveen, LLC $22,736,413 0.42% 871,795
Small AVENIR CORP $21,935,861 0.41% 841,099
Mid 683 Capital Management, LLC $20,212,000 0.38% 775,000
Mega PRINCIPAL FINANCIAL GROUP INC $19,422,505 0.36% 744,728
Large Russell Investments Group, Ltd. $18,616,630 0.35% 713,828
Mid Ancora Advisors LLC $18,337,343 0.34% 703,119
Mid Penn Capital Management Company, LLC $18,108,700 0.34% 694,352
Mid CACTI ASSET MANAGEMENT LLC $17,836,629 0.33% 881,692
Mega FIL Ltd $17,008,306 0.32% 652,159
Mega WELLS FARGO & COMPANY/MN $16,604,455 0.31% 636,674
Mega MILLENNIUM MANAGEMENT LLC $16,457,914 0.31% 631,055
Small Arvin Capital Management LP $15,556,720 0.29% 596,500
Large Public Sector Pension Investment Board Pension $14,338,705 0.27% 549,797
Mid ROYCE & ASSOCIATES LP $14,338,210 0.27% 549,778
Mega VAN ECK ASSOCIATES CORP $14,282,555 0.27% 547,644
Large Gotham Asset Management, LLC $13,588,749 0.25% 521,041
Mega AQR CAPITAL MANAGEMENT LLC $13,244,542 0.25% 507,843
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $13,139,104 0.24% 503,800
Large NEW YORK STATE COMMON RETIREMENT FUND Pension $13,104,860 0.24% 502,487
Large Caption Management, LLC $11,736,000 0.22% 450,000
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $11,172,672 0.21% 428,400
Large CI INVESTMENTS INC. $10,955,373 0.20% 420,068
Large Vident Advisory, LLC $10,141,519 0.19% 388,862
Small De Lisle Partners LLP $9,905,653 0.18% 379,818
Mid Aristotle Capital Boston, LLC $8,996,974 0.17% 344,976
Mega Legal & General Group Plc $8,734,086 0.16% 334,896
Large HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC $8,705,504 0.16% 333,800
Large Mawer Investment Management Ltd. $8,705,243 0.16% 333,790
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $8,607,677 0.16% 330,049
Mega AMERIPRISE FINANCIAL INC $8,599,749 0.16% 329,745
Small Rovida Investment Management Ltd $8,215,200 0.15% 315,000
Mega Swiss National Bank Bank $8,173,237 0.15% 313,391
Small Hyperion Capital Advisors LP $7,917,262 0.15% 303,576
Mega RHUMBLINE ADVISERS $7,831,641 0.15% 300,293
Large SEI INVESTMENTS CO $7,684,940 0.14% 294,668
Small GRIZZLYROCK CAPITAL, LLC $7,540,067 0.14% 289,113
Mega California Public Employees Retirement System Pension $7,225,516 0.13% 277,052
Large SG Americas Securities, LLC Broker-Dealer $7,161,620 0.13% 274,602
Large FIFTH THIRD BANCORP Bank $7,128,081 0.13% 273,316
Mid FIRST NATIONAL BANK OF OMAHA Bank $6,467,943 0.12% 248,004
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $6,466,717 0.12% 247,957
Mega RAYMOND JAMES FINANCIAL INC $6,411,089 0.12% 245,824
Mega CITADEL ADVISORS LLC $6,363,520 0.12% 244,000
Large EXCHANGE TRADED CONCEPTS, LLC $6,310,260 0.12% 305,286
Small Soviero Asset Management, LP $6,259,200 0.12% 240,000
Micro AWH Capital, L.P. $6,135,320 0.11% 235,250
Mega ROYAL BANK OF CANADA Bank $6,043,828 0.11% 231,742
Mega FIRST TRUST ADVISORS LP $5,948,404 0.11% 228,083
Mid Twin Tree Management, LP $5,688,048 0.11% 218,100
Mid SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC $5,679,702 0.11% 217,780
Small SEGRA CAPITAL MANAGEMENT, LLC $5,216,000 0.10% 200,000
Small Hudson Value Partners, LLC $5,171,323 0.10% 250,185
Mega JANE STREET GROUP, LLC $5,006,811 0.09% 191,979
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $4,813,194 0.09% 184,555
Mega CITADEL ADVISORS LLC $4,751,776 0.09% 182,200
Small Hel Ved Capital Management Ltd $4,655,280 0.09% 178,500
Mid OpenArc Corporate Advisory, LLC $4,442,780 0.08% 170,352
Mid OPPENHEIMER & CO INC $4,404,181 0.08% 168,872
Small Arvin Capital Management LP $3,912,000 0.07% 150,000
Mid WEDGE CAPITAL MANAGEMENT L L P/NC $3,882,487 0.07% 187,832
Small Telos Capital Management, Inc. $3,836,579 0.07% 185,611
Large Quantinno Capital Management LP $3,796,569 0.07% 145,574
Key facts CIK 2011286 CUSIP 023939101 13F (30d) 103 filings 103 filers Visit website Investor relations

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