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 ($4.0m this quarter). Holder counts are more reliable. Shares outstanding: 243.6m as of 2025-11-14, 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 ≈ $23.95. Options: 11 managers hold calls ($22.9m notional), 10 hold puts ($15.4m).
Trends to Q3 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 |
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 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q4 2024 | $93.5m | $43.8m | 0.47 |
| Q1 2025 | $62.3m | $41.7m | 0.67 |
| Q2 2025 | $57.6m | $31.4m | 0.54 |
| Q3 2025 | $22.9m | $15.4m | 0.67 |
Biggest buyers
| Invesco Ltd. | Added | +2.5m |
| FMR LLC | Added | +1.7m |
| Verition Fund Management LLC | Added | +1.0m |
| Point72 Asset Management, L.P. | Added | +1.0m |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | Added | +701.9k |
| GOLDMAN SACHS GROUP INC | Added | +573.7k |
| VOYA INVESTMENT MANAGEMENT LLC | Added | +433.4k |
| SEGRA CAPITAL MANAGEMENT, LLC | New | +417.0k |
| TWO SIGMA INVESTMENTS, LP | Added | +385.4k |
| Hyperion Capital Advisors LP | Added | +368.5k |
Biggest sellers
| MILLENNIUM MANAGEMENT LLC | Reduced | -4.0m |
| VAN ECK ASSOCIATES CORP | Reduced | -2.3m |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT | Reduced | -1.2m |
| BlackRock, Inc. | Reduced | -1.0m |
| VANGUARD GROUP INC | Reduced | -979.1k |
| Voss Capital, LP | Reduced | -775.0k |
| ROYAL BANK OF CANADA | Reduced | -644.3k |
| Kopernik Global Investors, LLC | Sold out | -636.2k |
| Engine Capital Management, LP | Sold out | -635.3k |
| UBS Group AG | Reduced | -535.1k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $7.3m306.5k shares |
| Walleye Trading LLC | Reduced | $4.0m167.0k shares |
| CITADEL ADVISORS LLC | Reduced | $2.5m104.6k shares |
| JANE STREET GROUP, LLC | Reduced | $2.3m94.3k shares |
| SIMPLEX TRADING, LLC | Reduced | $2.2m90.8k shares |
| GROUP ONE TRADING LLC | Reduced | $2.0m81.5k shares |
| WOLVERINE TRADING, LLC | New | $1.2m53.2k shares |
| TUDOR INVESTMENT CORP ET AL | Reduced | $445.5k18.6k shares |
| CAPITAL FUND MANAGEMENT S.A. | Reduced | $400.0k16.7k shares |
| Walleye Capital LLC | Reduced | $354.5k14.8k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $6.9m289.1k shares |
| CITADEL ADVISORS LLC | Reduced | $4.8m199.5k shares |
| GROUP ONE TRADING LLC | Reduced | $644.3k26.9k shares |
| JANE STREET GROUP, LLC | Reduced | $637.1k26.6k shares |
| SIMPLEX TRADING, LLC | Reduced | $558.0k23.3k shares |
| Walleye Trading LLC | Reduced | $550.9k23.0k shares |
| WOLVERINE TRADING, LLC | New | $527.1k23.1k shares |
| GOLDMAN SACHS GROUP INC | Unchanged | $289.4k12.1k shares |
| CAPITAL FUND MANAGEMENT S.A. | Reduced | $270.6k11.3k shares |
| Walleye Capital LLC | Added | $198.8k8.3k 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 Q3 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 |
|---|---|---|---|---|---|
| Q4 2023 | 0 | — | 0 | — | — |
| 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 | — | — |
None reported in Q3 2025.
Holders, Q3 2025
| Manager | Shares | Change |
|---|---|---|
| AMERICAN SECURITIES LLC 100.00% of their portfolio | 45.0m $1.1bn | Unchanged |
| Invesco Ltd. 0.08% of their portfolio | 22.1m $529.7m | Added +2.5m |
| BlackRock, Inc. 0.01% of their portfolio | 18.0m $430.9m | Reduced -1.0m |
| VANGUARD GROUP INC 0.01% of their portfolio | 15.6m $372.5m | Reduced -979.1k |
| PRIMECAP MANAGEMENT CO/CA/ 0.22% of their portfolio | 11.9m $285.5m | Reduced -112.1k |
| STATE STREET CORP 0.01% of their portfolio | 6.8m $163.7m | Reduced -244.9k |
| FMR LLC 0.01% of their portfolio | 6.2m $149.3m | Added +1.7m |
| FRONTIER CAPITAL MANAGEMENT CO LLC 1.12% of their portfolio | 5.2m $124.6m | Reduced -258.1k |
| NorthCoast Asset Management LLC 0.28% of their portfolio | 3.0m $72.0m | Added +7.1k |
| THOMPSON SIEGEL & WALMSLEY LLC 1.06% of their portfolio | 2.7m $65.4m | Reduced -56.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 2.7m $63.6m | Added +141.0k |
| Ruane, Cunniff & Goldfarb L.P. 0.96% of their portfolio | 2.4m $58.0m | Reduced -18.0k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.08% of their portfolio | 2.1m $49.9m | Added +701.9k |
| Freestone Grove Partners LP 0.37% of their portfolio | 2.1m $49.1m | Unchanged |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 1.8m $44.1m | Added +97.2k |
| MORGAN STANLEY 0.00% of their portfolio | 1.8m $43.3m | Reduced -370.8k |
| Thrivent Financial for Lutherans 0.09% of their portfolio | 1.8m $43.2m | Added +118.3k |
| Arvin Capital Management LP 9.07% of their portfolio | 1.6m $39.2m | Reduced -502.9k |
| FIL Ltd 0.03% of their portfolio | 1.6m $37.3m | Reduced -508.2k |
| Point72 Asset Management, L.P. 0.07% of their portfolio | 1.4m $33.1m | Added +1.0m |
| DIMENSIONAL FUND ADVISORS LP 0.01% of their portfolio | 1.3m $31.3m | Reduced -28.7k |
| 683 Capital Management, LLC 2.77% of their portfolio | 1.3m $30.5m | Reduced -355.0k |
| BRIGHTLINE CAPITAL MANAGEMENT, LLC 11.78% of their portfolio | 1.2m $28.7m | Added +200.0k |
| DISCOVERY CAPITAL MANAGEMENT, LLC / CT 1.50% of their portfolio | 1.1m $27.3m | Reduced -1.2m |
| Verition Fund Management LLC 0.16% of their portfolio | 1.1m $27.2m | Added +1.0m |
| VOYA INVESTMENT MANAGEMENT LLC 0.03% of their portfolio | 1.1m $26.0m | Added +433.4k |
| LOOMIS SAYLES & CO L P 0.03% of their portfolio | 1.1m $25.5m | Added +4.9k |
| Penn Capital Management Company, LLC 1.77% of their portfolio | 960.6k $23.1m | Reduced -42.9k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 942.9k $22.6m | Added +1.9k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 866.3k $20.7m | Reduced -1.9k |
| AVENIR CORP 2.15% of their portfolio | 862.5k $20.7m | Reduced -32.9k |
| CACTI ASSET MANAGEMENT LLC 1.27% of their portfolio | 857.1k $19.3m | Added +8.1k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 811.9k $19.4m | Added +573.7k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 798.4k $19.1m | Reduced -69.8k |
| VAN ECK ASSOCIATES CORP 0.02% of their portfolio | 765.7k $18.3m | Reduced -2.3m |
| Nuveen, LLC 0.00% of their portfolio | 751.3k $18.0m | Added +234.7k |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 735.8k $17.6m | Reduced -8.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 659.1k $15.8m | Reduced -34.7k |
| MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio | 640.8k $15.3m | Reduced -4.0m |
| Voss Capital, LP 0.86% of their portfolio | 625.0k $15.0m | Reduced -775.0k |
| Public Sector Pension Investment Board 0.05% of their portfolio | 598.0k $14.3m | Added +83.8k |
| BW Gestao de Investimentos Ltda. 0.93% of their portfolio | 511.5k $12.2m | Reduced -203.6k |
| Vident Advisory, LLC 0.11% of their portfolio | 454.7k $10.9m | Added +22.5k |
| ROYCE & ASSOCIATES LP 0.11% of their portfolio | 454.5k $10.9m | Added +119.5k |
| CI INVESTMENTS INC. 0.04% of their portfolio | 428.3k $10.3m | Reduced -26.2k |
| Hyperion Capital Advisors LP 5.38% of their portfolio | 420.0k $10.1m | Added +368.5k |
| SEGRA CAPITAL MANAGEMENT, LLC 11.55% of their portfolio | 417.0k $10.0m | New |
| Aristotle Capital Boston, LLC 0.51% of their portfolio | 409.1k $9.8m | Reduced -13.8k |
| MOORE CAPITAL MANAGEMENT, LP 0.19% of their portfolio | 407.4k $9.8m | Reduced -203.7k |
| TWO SIGMA INVESTMENTS, LP 0.01% of their portfolio | 399.1k $9.6m | Added +385.4k |
| Legal & General Group Plc 0.00% of their portfolio | 388.3k $9.3m | Reduced -16.4k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 355.9k $8.5m | Added +13.1k |
| COMERICA BANK 0.03% of their portfolio | 312.6k $7.5m | Reduced -49.2k |
| CenterBook Partners LP 0.36% of their portfolio | 308.1k $7.4m | Added +182.7k |
| Swiss National Bank 0.00% of their portfolio | 306.5k $7.3m | Added +4.3k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 301.3k $7.2m | New |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 289.8k $6.9m | Added +2.6k |
| Russell Investments Group, Ltd. 0.01% of their portfolio | 289.5k $6.9m | Reduced -38.6k |
| GRIZZLYROCK CAPITAL, LLC 5.27% of their portfolio | 283.1k $6.8m | Added +29.8k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 277.9k $6.7m | Reduced -152.6k |
| HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC 0.02% of their portfolio | 268.1k $6.4m | New |
| EXCHANGE TRADED CONCEPTS, LLC 0.06% of their portfolio | 267.5k $6.4m | Added +264.2k |
| Trexquant Investment LP 0.06% of their portfolio | 255.7k $6.1m | New |
| Gotham Asset Management, LLC 0.03% of their portfolio | 244.8k $5.9m | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 242.1k $5.8m | Reduced -644.3k |
| AWH Capital, L.P. 5.88% of their portfolio | 235.2k $5.6m | Added +70.0k |
| California Public Employees Retirement System 0.00% of their portfolio | 232.0k $5.6m | Added +3.1k |
| UBS Group AG 0.00% of their portfolio | 231.2k $5.5m | Reduced -535.1k |
| TWINBEECH CAPITAL LP 0.21% of their portfolio | 222.7k $5.3m | New |
| ALGERT GLOBAL LLC 0.09% of their portfolio | 221.6k $5.3m | Added +197.7k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 209.5k $5.0m | Added +118.2k |
| CSM Advisors, LLC 0.14% of their portfolio | 202.8k $4.9m | Reduced -430.2k |
| SEI INVESTMENTS CO 0.01% of their portfolio | 200.5k $4.8m | Reduced -18.6k |
| Telos Capital Management, Inc. 0.44% of their portfolio | 189.9k $4.5m | Reduced -30.9k |
| HRT FINANCIAL LP 0.02% of their portfolio | 186.2k $4.5m | New |
| Hudson Value Partners, LLC 1.40% of their portfolio | 185.8k $4.5m | Added +124 |
| COUNTRY CLUB BANK 0.23% of their portfolio | 172.5k $3.9m | Added +144 |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 169.7k $4.1m | Reduced -179.0k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 165.2k $4.0m | Reduced -185.0k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 162.3k $3.9m | Added +33 |
| TWO SIGMA ADVISERS, LP 0.01% of their portfolio | 159.2k $3.8m | New |
| Soviero Asset Management, LP 2.29% of their portfolio | 155.0k $3.7m | Added +45.0k |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC 0.01% of their portfolio | 150.3k $3.8m | Reduced -4.8k |
| PRUDENTIAL FINANCIAL INC 0.00% of their portfolio | 147.2k $3.5m | Reduced -2.8k |
| Atom Investors LP 0.26% of their portfolio | 144.3k $3.5m | New |
| NEW YORK STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 140.9k $3.4m | Added +3.5k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 139.4k $3.3m | Reduced -50.4k |
| Ancora Advisors LLC 0.06% of their portfolio | 133.9k $3.2m | Added +1.7k |
| Engineers Gate Manager LP 0.03% of their portfolio | 125.5k $3.0m | New |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio | 120.9k $2.9m | Reduced -1.5k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 118.2k $2.8m | Added +12.0k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 118.0k $2.8m | Reduced -224.9k |
| ExodusPoint Capital Management, LP 0.04% of their portfolio | 106.2k $2.5m | Added +96.4k |
| GAMCO INVESTORS, INC. ET AL 0.02% of their portfolio | 99.6k $2.4m | Reduced -9.0k |
| North Growth Management Ltd. 0.40% of their portfolio | 97.0k $2.3m | Unchanged |
| DARK FOREST CAPITAL MANAGEMENT LP 0.09% of their portfolio | 95.9k $2.3m | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 91.4k $2.2m | Reduced -459 |
| LPL Financial LLC 0.00% of their portfolio | 90.7k $2.2m | Reduced -5 |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 89.6k $2.1m | Reduced -7.2k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 87.6k $2.1m | Reduced -12.5k |