AMENTUM HOLDINGS INC AMTM
COM · Common Stock · CUSIP 023939101 · ISIN US0239391016
American energy and defense projects contractor
- SectorIndustrials
- IndustryServices-Business Services, NEC
- HeadquartersChantilly, VA
- Founded2020
- Websiteamentum.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($4.8m this quarter). Holder counts are more reliable. Shares outstanding: 243.9m as of 2026-02-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $27.66. Options: 14 managers hold calls ($85.8m notional), 12 hold puts ($30.3m).
Trends to Q4 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2024 | 493 |
| Q4 2024 | 452 |
| Q1 2025 | 420 |
| Q2 2025 | 462 |
| Q3 2025 | 462 |
| Q4 2025 | 483 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2024 | 209 | 340 |
| Q1 2025 | 179 | 245 |
| Q2 2025 | 338 | 163 |
| Q3 2025 | 178 | 248 |
| Q4 2025 | 198 | 215 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2025 | $62.3m | $41.7m | 0.67 |
| Q2 2025 | $57.6m | $31.4m | 0.54 |
| Q3 2025 | $22.9m | $15.4m | 0.67 |
| Q4 2025 | $85.8m | $30.3m | 0.35 |
Biggest buyers
| Legacy Advisors, LLC | New | +9.8m |
| Focus Partners Wealth | Added | +2.8m |
| COOPER CREEK PARTNERS MANAGEMENT LLC | New | +1.6m |
| AQR CAPITAL MANAGEMENT LLC | Added | +1.3m |
| ExodusPoint Capital Management, LP | Added | +1.1m |
| FRONTIER CAPITAL MANAGEMENT CO LLC | Added | +570.3k |
| DIMENSIONAL FUND ADVISORS LP | Added | +526.9k |
| FMR LLC | Added | +472.1k |
| WELLS FARGO & COMPANY/MN | Added | +421.3k |
| Gotham Asset Management, LLC | Added | +390.6k |
Biggest sellers
| NorthCoast Asset Management LLC | Sold out | -3.0m |
| Freestone Grove Partners LP | Sold out | -2.1m |
| STATE STREET CORP | Reduced | -1.8m |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT | Sold out | -1.1m |
| THOMPSON SIEGEL & WALMSLEY LLC | Reduced | -808.5k |
| Point72 Asset Management, L.P. | Reduced | -685.7k |
| Voss Capital, LP | Sold out | -625.0k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -579.6k |
| BlackRock, Inc. | Reduced | -531.4k |
| BW Gestao de Investimentos Ltda. | Sold out | -511.5k |
Biggest calls
| PEAK6 LLC | New | $24.3m836.8k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $17.6m607.2k shares |
| CITADEL ADVISORS LLC | Added | $9.2m316.7k shares |
| Caption Management, LLC | New | $7.0m240.1k shares |
| Twin Tree Management, LP | New | $6.0m208.1k shares |
| Arvin Capital Management LP | New | $4.8m164.5k shares |
| SIMPLEX TRADING, LLC | Added | $4.3m147.7k shares |
| GROUP ONE TRADING LLC | Added | $4.2m146.3k shares |
| Walleye Trading LLC | Reduced | $2.7m91.9k shares |
| JANE STREET GROUP, LLC | Reduced | $2.2m75.2k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $12.2m420.7k shares |
| Caption Management, LLC | New | $5.8m200.0k shares |
| CITADEL ADVISORS LLC | Reduced | $5.2m179.2k shares |
| IMC-Chicago, LLC | New | $1.6m53.7k shares |
| NOMURA HOLDINGS INC | New | $1.4m47.0k shares |
| GROUP ONE TRADING LLC | Added | $1.1m39.4k shares |
| JANE STREET GROUP, LLC | Added | $1.0m35.9k shares |
| Twin Tree Management, LP | New | $835.2k28.8k shares |
| SIMPLEX TRADING, LLC | Reduced | $603.2k20.8k shares |
| Walleye Trading LLC | Reduced | $345.1k11.9k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
ASP Manager Corp.
13D · may seek influence
new · filed 2024-12-23
Stated purposeThe information set forth or incorporated by reference in Items 3, 5 and 6 is hereby incorporated by reference in this Item 4. Director Nominees Benjamin Dickson, a managing director of American Securities LLC, and Connor Wentzell, a principal of American Securities LLC, are nominees of the Sponsor Stockholders (as defined below) to the Issuer's board of directors (the "Board") pursuant to the Stockholders Agreement (as defined below). Alan Goldberg, the co-founder and chief executive officer of Goldberg Lindsay & Co. LLC, an affiliate of LG (as defined below), and Russell Triedman, a managing partner of Goldberg Lindsay & Co. LLC, are also nominees of the Sponsor Stockholders on the Board pursuant to the Stockholders Agreement. General The Reporting Persons acquired the secur… Full filing |
18.0% |
GOLDBERG ALAN E
13D · may seek influence
new · filed 2024-12-23
Stated purposeThe information set forth or incorporated by reference in Items 3, 5 and 6 is hereby incorporated by reference in this Item 4. Director Nominees Mr. Goldberg, the co-founder and chief executive officer of Goldberg Lindsay & Co. LLC, an affiliate of the Reporting Persons, and Russell Triedman, a managing partner of Goldberg Lindsay & Co. LLC, are nominees of the Sponsor Stockholders (as defined below) to the Issuer's board of directors (the "Board") pursuant to the Stockholders Agreement (as defined below). Benjamin Dickson, a managing director of American Securities LLC, an affiliate of AS (as defined below), and Connor Wentzell, a principal of American Securities LLC, are also nominees of the Sponsor Stockholders on the Board pursuant to the Stockholders Agreement. General The Report… Full filing |
18.0% |
| Invesco Ltd. 13G · institution +1.0 pts · filed 2026-05-07 | 10.1% |
| BlackRock, Inc. 13G · institution filed 2025-02-05 | 6.9% |
| PRIMECAP MANAGEMENT CO/CA/ 13G · institution new · filed 2026-08-06 | 5.0% |
Fell to 5% or below in the last year: VANGUARD GROUP INC (0.0%, 2026-03-26)
Insider purchases and sales in Q4 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 0 | — | 0 | — | — |
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 2 | $2.2m | 0 | — | — |
| Q2 2025 | 0 | — | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
None reported in Q4 2025.
Holders, Q4 2025
| Manager | Shares | Change |
|---|---|---|
| AMERICAN SECURITIES LLC 100.00% of their portfolio | 45.0m $1.3bn | Unchanged |
| Invesco Ltd. 0.06% of their portfolio | 21.8m $633.2m | Reduced -282.8k |
| BlackRock, Inc. 0.01% of their portfolio | 17.5m $506.3m | Reduced -531.4k |
| VANGUARD GROUP INC 0.01% of their portfolio | 15.4m $446.9m | Reduced -142.9k |
| PRIMECAP MANAGEMENT CO/CA/ 0.27% of their portfolio | 12.1m $351.7m | Added +208.3k |
| Legacy Advisors, LLC 1.05% of their portfolio | 9.8m $9.8m | New |
| FMR LLC 0.01% of their portfolio | 6.7m $194.5m | Added +472.1k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 1.78% of their portfolio | 5.8m $167.4m | Added +570.3k |
| STATE STREET CORP 0.00% of their portfolio | 5.1m $146.8m | Reduced -1.8m |
| Focus Partners Wealth 0.09% of their portfolio | 2.8m $81.0m | Added +2.8m |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 2.7m $77.1m | Added +5.2k |
| Ruane, Cunniff & Goldfarb L.P. 1.08% of their portfolio | 2.4m $69.4m | Reduced -29.6k |
| NORGES BANK 0.01% of their portfolio | 2.3m $66.5m | Not comparable |
| MORGAN STANLEY 0.00% of their portfolio | 2.1m $60.2m | Added +268.9k |
| Thrivent Financial for Lutherans 0.11% of their portfolio | 2.1m $60.0m | Added +263.7k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.09% of their portfolio | 2.0m $56.9m | Reduced -119.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 2.0m $56.6m | Added +109.8k |
| THOMPSON SIEGEL & WALMSLEY LLC 0.94% of their portfolio | 1.9m $55.7m | Reduced -808.5k |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 1.8m $53.2m | Added +526.9k |
| Arvin Capital Management LP 10.22% of their portfolio | 1.6m $47.5m | Unchanged |
| COOPER CREEK PARTNERS MANAGEMENT LLC 2.13% of their portfolio | 1.6m $45.0m | New |
| AQR CAPITAL MANAGEMENT LLC 0.02% of their portfolio | 1.5m $42.1m | Added +1.3m |
| FIL Ltd 0.03% of their portfolio | 1.4m $41.5m | Reduced -129.6k |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC 16.32% of their portfolio | 1.4m $40.4m | Added +192.0k |
| ExodusPoint Capital Management, LP 0.38% of their portfolio | 1.2m $34.3m | Added +1.1m |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 1.2m $33.6m | Added +359.0k |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 1.1m $33.3m | Added +62.5k |
| LOOMIS SAYLES & CO L P 0.04% of their portfolio | 1.1m $32.4m | Added +54.9k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 953.0k $27.6m | Added +10.0k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 922.1k $26.7m | Added +55.8k |
| CACTI ASSET MANAGEMENT LLC 1.55% of their portfolio | 881.7k $25.7m | Added +24.6k |
| Verition Fund Management LLC 0.14% of their portfolio | 865.2k $25.1m | Reduced -270.5k |
| AVENIR CORP 2.68% of their portfolio | 850.9k $24.7m | Reduced -11.5k |
| 683 Capital Management, LLC 2.01% of their portfolio | 835.0k $24.2m | Reduced -440.0k |
| Nuveen, LLC 0.01% of their portfolio | 813.8k $23.6m | Added +62.5k |
| Penn Capital Management Company, LLC 1.72% of their portfolio | 743.9k $21.6m | Reduced -216.7k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 728.4k $21.1m | Reduced -7.3k |
| Point72 Asset Management, L.P. 0.03% of their portfolio | 695.3k $20.2m | Reduced -685.7k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 644.2k $18.7m | Reduced -167.8k |
| TWO SIGMA INVESTMENTS, LP 0.03% of their portfolio | 638.0k $18.5m | Added +238.9k |
| Gotham Asset Management, LLC 0.07% of their portfolio | 635.4k $18.4m | Added +390.6k |
| SEGRA CAPITAL MANAGEMENT, LLC 37.63% of their portfolio | 604.8k $17.5m | Added +187.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 535.2k $15.5m | Reduced -123.9k |
| VAN ECK ASSOCIATES CORP 0.01% of their portfolio | 531.0k $15.4m | Reduced -234.7k |
| Public Sector Pension Investment Board 0.05% of their portfolio | 530.6k $15.4m | Reduced -67.4k |
| ROYCE & ASSOCIATES LP 0.15% of their portfolio | 495.3k $14.4m | Added +40.8k |
| Hyperion Capital Advisors LP 6.98% of their portfolio | 491.9k $14.3m | Added +71.9k |
| MOORE CAPITAL MANAGEMENT, LP 0.28% of their portfolio | 475.3k $13.8m | Added +67.9k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 464.7k $13.5m | Added +421.3k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 437.0k $12.7m | Added +147.5k |
| CI INVESTMENTS INC. 0.05% of their portfolio | 425.5k $12.3m | Reduced -2.7k |
| Ancora Advisors LLC 0.24% of their portfolio | 402.3k $11.7m | Added +268.5k |
| Vident Advisory, LLC 0.10% of their portfolio | 382.5k $11.1m | Reduced -72.2k |
| FIRST TRUST ADVISORS LP 0.01% of their portfolio | 377.8k $11.0m | Added +339.2k |
| Legal & General Group Plc 0.00% of their portfolio | 368.6k $10.7m | Reduced -19.7k |
| Aristotle Capital Boston, LLC 0.57% of their portfolio | 358.9k $10.4m | Reduced -50.3k |
| SG Americas Securities, LLC 0.01% of their portfolio | 345.3k $10.0m | Added +316.3k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 338.6k $9.8m | Reduced -17.3k |
| Swiss National Bank 0.01% of their portfolio | 311.8k $9.0m | Added +5.3k |
| EXCHANGE TRADED CONCEPTS, LLC 0.08% of their portfolio | 310.5k $9.0m | Added +43.0k |
| COMERICA BANK 0.03% of their portfolio | 301.6k $8.7m | Reduced -11.1k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 291.4k $8.5m | Added +1.6k |
| GRIZZLYROCK CAPITAL, LLC 6.19% of their portfolio | 285.1k $8.3m | Added +2.0k |
| California Public Employees Retirement System 0.00% of their portfolio | 278.6k $8.1m | Added +46.6k |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC 0.02% of their portfolio | 268.4k $7.8m | Added +245 |
| Balyasny Asset Management L.P. 0.01% of their portfolio | 268.0k $7.8m | Added +232.0k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 266.5k $7.7m | Added +24.5k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 253.0k $7.3m | Reduced -24.9k |
| AWH Capital, L.P. 6.29% of their portfolio | 235.2k $6.8m | Unchanged |
| CenterBook Partners LP 0.31% of their portfolio | 222.2k $6.4m | Reduced -85.9k |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.22% of their portfolio | 219.9k $6.4m | Added +165.6k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 217.0k $6.3m | Added +16.5k |
| UBS Group AG 0.00% of their portfolio | 206.1k $6.0m | Reduced -25.1k |
| OpenArc Corporate Advisory, LLC 0.10% of their portfolio | 200.3k $5.8m | First filing |
| Hudson Value Partners, LLC 1.64% of their portfolio | 188.0k $5.5m | Added +2.2k |
| Telos Capital Management, Inc. 0.51% of their portfolio | 187.5k $5.4m | Reduced -2.4k |
| Soviero Asset Management, LP 2.70% of their portfolio | 178.0k $5.2m | Added +23.0k |
| FIRST NATIONAL BANK OF OMAHA 0.15% of their portfolio | 177.7k $5.2m | New |
| ALGERT GLOBAL LLC 0.08% of their portfolio | 172.5k $5.0m | Reduced -49.1k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 168.0k $4.9m | Added +28.6k |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 166.1k $4.8m | Added +25.1k |
| TWO SIGMA ADVISERS, LP 0.01% of their portfolio | 157.1k $4.6m | Reduced -2.1k |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC 0.01% of their portfolio | 155.8k $4.9m | Added +5.4k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 149.9k $4.3m | Reduced -12.4k |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 146.2k $4.2m | New |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 142.4k $4.1m | Reduced -4.8k |
| TWINBEECH CAPITAL LP 0.28% of their portfolio | 137.5k $4.0m | Reduced -85.3k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 129.5k $3.8m | Added +11.3k |
| South Dakota Investment Council 0.07% of their portfolio | 123.0k $3.6m | Added +58.6k |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 120.9k $3.5m | Unchanged |
| Caption Management, LLC 0.15% of their portfolio | 116.5k $3.4m | Added +75.4k |
| SOROS FUND MANAGEMENT LLC 0.04% of their portfolio | 109.3k $3.2m | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 103.7k $3.0m | Added +12.3k |
| Bryn Mawr Trust Advisors, LLC 0.14% of their portfolio | 101.9k $3.0m | Added +22.3k |
| WINTON GROUP Ltd 0.10% of their portfolio | 101.4k $2.9m | Added +48.0k |
| Blackstone Inc. 0.01% of their portfolio | 99.6k $2.9m | Added +50.5k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 99.0k $2.9m | Added +11.3k |
| North Growth Management Ltd. 0.44% of their portfolio | 98.0k $2.8m | Added +1.0k |
| GAMCO INVESTORS, INC. ET AL 0.03% of their portfolio | 91.9k $2.7m | Reduced -7.8k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 89.3k $2.6m | Reduced -120.3k |