13F

Stock

Amentum Holdings, Inc.

AMTM · held by 482 managers

Reported value

$5.41B

Holders

482

+9 new · −3 exited

Holders’ est. mark

$32.5M

Price effect on 7 books still in the name

Largest holder

$1.31B

AMERICAN SECURITIES LLC

Notable conviction

Share of each notable manager’s 13F book.

Holder count by quarter

Who holds it

Notable only
InvestorSharesValueEst. markChange
AMERICAN SECURITIES LLC45M$1.31BHeld
Invesco Ltd.21.8M$633.2MHeld
BlackRock, Inc.17.5M$506.3MHeld
Vanguard15.4M$446.9MHeld
PRIMECAP MANAGEMENT CO/CA/12.1M$351.7MHeld
Fidelity6.71M$194.5MHeld
FRONTIER CAPITAL MANAGEMENT CO LLC5.77M$167.4MHeld
State Street5.06M$146.8MHeld
Focus Partners Wealth2.79M$81MHeld
GEODE CAPITAL MANAGEMENT, LLC2.66M$77.1MHeld
Ruane, Cunniff & Goldfarb L.P.2.39M$69.4MHeld
NORGES BANK2.29M$66.5M$18.5MAdded$35.3M
MORGAN STANLEY2.08M$60.2M$9.12MAdded$16.9M
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.1.96M$56.9MHeld
CHARLES SCHWAB INVESTMENT MANAGEMENT INC1.95M$56.6MHeld
DIMENSIONAL FUND ADVISORS LP1.83M$53.2MHeld
Arvin Capital Management LP1.64M$47.5MHeld
Icahn Capital1.45M$42.1MHeld
FIL Ltd1.43M$41.5MHeld
BRIGHTLINE CAPITAL MANAGEMENT, LLC1.39M$40.4MHeld
ExodusPoint Capital Management, LP1.18M$34.3MHeld
BANK OF AMERICA CORP /DE/1.16M$33.6M$4.03MAdded$14.4M
VOYA INVESTMENT MANAGEMENT LLC1.15M$33.3MHeld
LOOMIS SAYLES & CO L P1.12M$32.4MHeld
NORTHERN TRUST CORP953K$27.6MHeld
Bank of New York Mellon Corp922.1K$26.7MHeld
CACTI ASSET MANAGEMENT LLC881.7K$25.7MHeld
Verition Fund Management LLC865.2K$25.1MHeld
AVENIR CORP850.9K$24.7MHeld
683 Capital Management, LLC835K$24.2MHeld
Nuveen, LLC813.8K$23.6MHeld
Penn Capital Management Company, LLC743.9K$21.6MHeld
PRINCIPAL FINANCIAL GROUP INC728.4K$21.1MHeld
Point72 Asset Management, L.P.695.3K$20.2MHeld
GOLDMAN SACHS GROUP INC644.2K$18.7MHeld
TWO SIGMA INVESTMENTS, LP638K$18.5MHeld
Gotham Asset Management, LLC635.4K$18.4MHeld
SEGRA CAPITAL MANAGEMENT, LLC604.8K$17.5MHeld
NEW YORK STATE COMMON RETIREMENT FUND535.2K$15.5MHeld
PUBLIC SECTOR PENSION INVESTMENT BOARD530.6K$15.4MHeld
ROYCE & ASSOCIATES LP495.3K$14.4MHeld
Hyperion Capital Advisors LP491.9K$14.3MHeld
MOORE CAPITAL MANAGEMENT, LP475.3K$13.8MHeld
WELLS FARGO & COMPANY/MN464.7K$13.5MHeld
Russell Investments Group, Ltd.437K$12.7MHeld
CI INVESTMENTS INC.425.5K$12.3MHeld
Ancora Advisors LLC402.3K$11.7MHeld
Vident Advisory, LLC382.5K$11.1MHeld
FIRST TRUST ADVISORS LP377.8K$11MHeld
Legal & General Group Plc368.6K$10.7MHeld
Aristotle Capital Boston, LLC358.9K$10.4MHeld
AMERIPRISE FINANCIAL INC338.6K$9.82MHeld
Legacy Advisors, LLC9.81M$9.81MHeld
Swiss National Bank311.8K$9.04MHeld
EXCHANGE TRADED CONCEPTS, LLC310.5K$9.01MHeld
COMERICA BANK301.6K$8.75MHeld
RHUMBLINE ADVISERS291.4K$8.45MHeld
GRIZZLYROCK CAPITAL, LLC285.1K$8.27MHeld
California Public Employees Retirement System278.6K$8.08MHeld
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC268.4K$7.78MHeld
Balyasny Asset Management L.P.268K$7.77MHeld
ROYAL BANK OF CANADA266.5K$7.73MHeld
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC253K$7.34MHeld
AWH Capital, L.P.235.3K$6.82MHeld
CenterBook Partners LP222.2K$6.44MHeld
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC219.9K$6.38MHeld
SEI INVESTMENTS CO217K$6.29MHeld
UBS Group AG206.1K$5.98MHeld
OpenArc Corporate Advisory, LLC200.3K$5.81MHeld
Hudson Value Partners, LLC188K$5.5MHeld
Telos Capital Management, Inc.187.5K$5.44MHeld
FIRST NATIONAL BANK OF OMAHA177.7K$5.21MNew
Soviero Asset Management, LP178K$5.16MHeld
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC155.8K$4.91MHeld
RAYMOND JAMES FINANCIAL INC168K$4.87MHeld
TWO SIGMA ADVISERS, LP157.1K$4.56MHeld
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM149.9K$4.35MHeld
Qube Research & Technologies Ltd146.2K$4.24MHeld
PRUDENTIAL FINANCIAL INC142.4K$4.13MHeld
TWINBEECH CAPITAL LP137.5K$3.99MHeld
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM120.9K$3.51MHeld
Caption Management, LLC116.5K$3.38MHeld
Soros Fund Management109.3K$3.17MHeld
STATE OF WISCONSIN INVESTMENT BOARD103.7K$3.01MHeld
Bryn Mawr Trust Advisors, LLC101.9K$2.96MHeld
WINTON GROUP Ltd101.4K$2.94MHeld
Blackstone Inc.99.6K$2.89MNew
State of New Jersey Common Pension Fund D99K$2.87MHeld
GAMCO INVESTORS, INC. ET AL91.9K$2.66MHeld
JPMORGAN CHASE & CO89.3K$2.59MHeld
LPL Financial LLC86.7K$2.51MHeld
BLAIR WILLIAM & CO/IL80K$2.32MHeld
Holocene Advisors, LP79.3K$2.3MHeld
CITIGROUP INC79K$2.29MHeld
Quantinno Capital Management LP78K$2.26MHeld
Pine Valley Investments Ltd Liability Co75.9K$2.2M$372.2KAdded$435.9K
ALLIANCEBERNSTEIN L.P.71.3K$2.07MHeld
Ridge Creek Global, Inc70.9K$2.06MHeld
Louisiana State Employees Retirement System70.2K$2.04MHeld
Resolute Capital Asset Partners LLC70K$2.03MHeld
JANUS HENDERSON GROUP PLC69.4K$2.01MHeld
WOLVERINE ASSET MANAGEMENT LLC68K$1.97MHeld
ENVESTNET ASSET MANAGEMENT INC67.7K$1.96MHeld
Police & Firemen's Retirement System of New Jersey66.7K$1.93MHeld
Mraz, Amerine & Associates, Inc.64.2K$1.86MHeld
HAHN CAPITAL MANAGEMENT LLC62K$1.8MHeld
MILLENNIUM MANAGEMENT LLC61.2K$1.77MHeld
Crestwood Advisors Group, LLC59.9K$1.74MHeld
State of Tennessee, Department of Treasury46.3K$1.66MHeld
Citadel55.6K$1.61MHeld
Cerity Partners LLC51.7K$1.5MHeld
Steadtrust LLC50.4K$1.46MNew
BARCLAYS PLC50.4K$1.46M$254.4KAdded$175.7K
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO49.2K$1.43MHeld
Mariner, LLC48.8K$1.42MHeld
VICTORY CAPITAL MANAGEMENT INC47K$1.36MHeld
Hikari Tsushin, Inc.45.4K$1.32MHeld
YOUSIF CAPITAL MANAGEMENT, LLC38.1K$1.31MHeld
Creative Planning44.8K$1.3MHeld
XTX Topco Ltd44.8K$1.3MHeld
ARIZONA STATE RETIREMENT SYSTEM43.9K$1.27MHeld
Atom Investors LP43.7K$1.27MHeld
Paragon Capital Management LLC43.7K$1.27MHeld
Versor Investments LP42.8K$1.24MHeld
IEQ CAPITAL, LLC38K$1.1MHeld
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS38K$1.1MHeld
Corient Private Wealth LLC36.9K$1.07MHeld
MANUFACTURERS LIFE INSURANCE COMPANY, THE36.9K$1.07MHeld
CAPITAL FUND MANAGEMENT S.A.36.8K$1.07MHeld
JONES FINANCIAL COMPANIES LLLP36.3K$1.05MHeld
Clear Harbor Asset Management, LLC36.3K$1.05MHeld
TEACHER RETIREMENT SYSTEM OF TEXAS35.8K$1.04MHeld
NISA INVESTMENT ADVISORS, LLC35.8K$1.04MHeld
Williams Jones Wealth Management, LLC.35.5K$1.03MHeld
OREGON PUBLIC EMPLOYEES RETIREMENT FUND35.1K$1.02MHeld
MARSHALL WACE, LLP35.1K$1.02MHeld
Brevan Howard Capital Management LP35K$1.02MHeld
TOWER BRIDGE ADVISORS34.2K$991.3KHeld
Tidal Investments LLC34K$984.9KHeld
Zurcher Kantonalbank (Zurich Cantonalbank)33.4K$969.7KHeld
Universal- Beteiligungs- und Servicegesellschaft mbH33.2K$963.5KHeld
CANADA PENSION PLAN INVESTMENT BOARD33K$956.8KHeld
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.33K$956.4KHeld
Oak Thistle LLC33K$955.7KHeld
CAPTRUST FINANCIAL ADVISORS31.9K$926.1KHeld
Pathstone Holdings, LLC31.9K$925.9KHeld
DBA TRADING, LLC31.2K$904.7KHeld
Dynamic Technology Lab Private Ltd30.9K$895KHeld
STIFEL FINANCIAL CORP30.6K$886KHeld
Maryland State Retirement & Pension System29.9K$867.5KHeld
American Trust Investment Advisors, LLC29.2K$846.1KHeld
OSAIC HOLDINGS, INC.29.1K$844.7KHeld
GROUP ONE TRADING LLC28.5K$826.4KHeld
National Philanthropic Trust27.4K$795.7K$138.6KCut−$14.5K
Wilmington Savings Fund Society, FSB26.9K$779.2KHeld
SECURITY NATIONAL BANK OF SO DAK26.6K$772.6KHeld
US BANCORP \DE\25.6K$742.4KHeld
Pictet Asset Management Holding SA25.3K$732.3KHeld
Alpine Global Management, LLC25K$725KHeld
AlphaQuest LLC24.1K$699.2KHeld
Peak Asset Management, LLC24K$696KHeld
STEPHENS INC /AR/22.6K$654.1KHeld
DOVER ADVISORS, LLC22.2K$644.4KHeld
Modera Wealth Management, LLC21.9K$636.4KHeld
GABELLI FUNDS LLC21.4K$620.3KHeld
Cetera Investment Advisers21.3K$616.9KHeld
DEUTSCHE BANK AG\21.2K$614.1KHeld
Advisors Asset Management, Inc.21.1K$611.3KHeld
Magnetar Financial LLC20.9K$605.4KHeld
Qsemble Capital Management, LP20.1K$583.9KHeld
BANK OF MONTREAL /CAN/19.4K$562.9KHeld
Old West Investment Management, LLC19.4K$561.3KHeld
CLIFFORD SWAN INVESTMENT COUNSEL LLC19.4K$561.3KHeld
SECURITY NATIONAL BANK OF SIOUX CITY IOWA /IA/19.3K$559.4KHeld
Carlson Capital, L.P.19K$551KHeld
WELLINGTON MANAGEMENT GROUP LLP18.9K$549.5KHeld
Legal Advantage Investments, Inc.18.9K$548.1KHeld
CIBC Asset Management Inc18.9K$547.7KHeld
NEUBERGER BERMAN GROUP LLC18.9K$547.3KHeld
OXFORD ASSET MANAGEMENT LLP18.6K$540.2KNew
TRUIST FINANCIAL CORP18.5K$537.1KHeld
Bridgewater18.3K$529.3KHeld
Vanguard Personalized Indexing Management, LLC17.8K$514.8KHeld
Sterling Capital Management LLC17.6K$509.8KHeld
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC17.5K$508.1KHeld
Intrinsic Value Partners, LLC16.7K$483.7KHeld
COMMONWEALTH EQUITY SERVICES, LLC16.5K$478.8KHeld
Impact Partnership Wealth, LLC16.3K$473.1KHeld
Gryphon Financial Partners LLC16.3K$472.3KHeld
LEAVELL INVESTMENT MANAGEMENT, INC.16.1K$468KHeld
PROFUND ADVISORS LLC15.8K$457.4KHeld
TOTH FINANCIAL ADVISORY CORP15.7K$455KHeld
MACKENZIE FINANCIAL CORP15.5K$452.6KHeld
MERCER GLOBAL ADVISORS INC /ADV15.5K$452.6KHeld
Summit Financial, LLC15.2K$440.1KHeld
LuminArx Capital Management LP15K$435KHeld
HighTower Advisors, LLC14.6K$424.6KHeld
First Bank & Trust14.2K$410.8KHeld
FIRST MANHATTAN CO. LLC.14.1K$409.4KHeld
Granite Investment Partners, LLC13.2K$384.2KHeld
EVERGREEN CAPITAL MANAGEMENT LLC13.2K$382.7KHeld
QUADRANT CAPITAL GROUP LLC13.1K$378.6KHeld
Marex Group plc13K$377.1KNew
PNC Financial Services Group, Inc.12.6K$366.1KHeld
DAVENPORT & Co LLC12.5K$361.3KHeld
Advyzon Investment Management, LLC12.3K$356KHeld
CAHABA WEALTH MANAGEMENT, INC.12.1K$350.2KHeld
BCS Private Wealth Management, Inc.12K$348KHeld
FRANKLIN RESOURCES INC11.9K$346KHeld
State of Wyoming11.9K$345.6KHeld
Caldwell Investment Management Ltd.11.7K$341.7KHeld
SHUFRO ROSE & CO LLC10.9K$315.2KHeld
JANE STREET GROUP, LLC10.8K$313.5KHeld
Y-Intercept (Hong Kong) Ltd10.5K$304.4KHeld
Grantham, Mayo, Van Otterloo & Co. LLC10.5K$303.3KHeld
M&T Bank Corp10.1K$291.9KHeld
Symmetry Investments LP10K$290KHeld
ARS Investment Partners, LLC10K$290KHeld
BROWN ADVISORY INC9.95K$288.5KHeld
Allworth Financial LP9.85K$285.6K$49.7KAdded$44.8K
SFMG, LLC9.77K$283.4KHeld
VIRGINIA RETIREMENT SYSTEMS ET Al9.6K$278.4KHeld
GUGGENHEIM CAPITAL LLC9.44K$273.7KHeld
PFG Investments, LLC9.42K$273.3KHeld
Ensign Peak Advisors, Inc9.39K$272.2KHeld
Caprock Group, LLC9.31K$270KHeld
Comprehensive Financial Planning, Inc./PA8.83K$256.1KHeld
SYON CAPITAL LLC8.73K$253.1KHeld
Aberdeen Wealth Management LLC8.64K$250.6KHeld
SILVERCREST ASSET MANAGEMENT GROUP LLC8.52K$246.9KHeld
XPONANCE LLC8.44K$244.7KHeld
Concurrent Investment Advisors, LLC8.38K$243.1KHeld
Utah Retirement Systems8.34K$241.8KHeld
WEXFORD CAPITAL LP8.25K$239.3KHeld
Badgley Phelps Wealth Managers, LLC8.15K$236.5KHeld
Lido Advisors, LLC9.85K$236.2KHeld
Washington Trust Advisors, Inc.8.13K$235.8KHeld
FRG Family Wealth Advisors LLC7.86K$228.1KHeld
MIRABELLA FINANCIAL SERVICES LLP7.81K$226.4KNew
KEYBANK NATIONAL ASSOCIATION/OH7.69K$223KHeld
Machina Capital S.A.S.7.48K$217KHeld
Summit Trail Advisors, LLC7.44K$215.9KHeld
SAGE RHINO CAPITAL LLC7.34K$212.7KHeld
FOX RUN MANAGEMENT, L.L.C.7.25K$210.2KHeld
BOOTHBAY FUND MANAGEMENT, LLC7.21K$209.2KHeld
Formidable Asset Management, LLC7.16K$207.7KHeld
Swiss Life Asset Management Ltd7.08K$205.5KNew
UNITED CAPITAL FINANCIAL ADVISORS, LLC6.95K$201.6KHeld
BOK Financial Private Wealth, Inc.6.91K$200.4KHeld
GAMMA Investing LLC5.3K$153.8KHeld

Who left

Positions as of Q4 2025. 13F filings arrive up to 45 days after quarter-end and omit shorts. Values are quarter-end marks, as filed. Estimated mark is the price effect on shares still held — not realized P&L or investment advice.