13F

Stock

Amentum Holdings, Inc.

AMTM · held by 484 managers

Reported value

$5.1B

Holders

484

+63 new · −61 exited

Holders’ est. mark

−$464M

Price effect on 208 books still in the name

Largest holder

$1.17B

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$1.17B−$131.5MCut−$131.5M
Invesco Ltd.21.5M$560M−$62.7MCut−$73.1M
BlackRock, Inc.17.8M$465.3M−$51MCut−$41M
PRIMECAP MANAGEMENT CO/CA/12.1M$315.2M−$35.3MCut−$36.5M
VANGUARD PORTFOLIO MANAGEMENT LLC7.85M$204.8MHeld
VANGUARD CAPITAL MANAGEMENT LLC6.65M$173.5MHeld
Fidelity5.58M$145.5M−$16.3MCut−$49M
State Street5.08M$132.5M−$14.8MCut−$14.3M
FRONTIER CAPITAL MANAGEMENT CO LLC4.93M$128.6M−$14.4MCut−$38.8M
DIMENSIONAL FUND ADVISORS LP3.79M$98.8M−$5.36MAdded$45.6M
GEODE CAPITAL MANAGEMENT, LLC2.81M$73.4M−$7.77MCut−$3.72M
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.2.79M$72.6M−$5.73MAdded$15.7M
Focus Partners Wealth2.6M$67.9M−$7.61MCut−$13.1M
BANK OF AMERICA CORP /DE/2.41M$62.7M−$3.38MAdded$29.2M
MORGAN STANLEY2.23M$58.3M−$6.06MCut−$1.9M
Arvin Capital Management LP2.07M$54M−$4.78MAdded$6.56M
CHARLES SCHWAB INVESTMENT MANAGEMENT INC2.07M$53.9M−$5.7MCut−$2.68M
UBS Group AG1.71M$44.6M−$601.8KAdded$38.6M
Point72 Asset Management, L.P.1.63M$42.5M−$2.03MAdded$22.4M
Ruane, Cunniff & Goldfarb L.P.1.62M$42.3M−$4.74MCut−$27.1M
SEGRA CAPITAL MANAGEMENT, LLC1.61M$42.1M−$1.77MAdded$24.5M
Permian Investment Partners, LP1.57M$40.9MNew
TORONTO DOMINION BANK1.57M$40.8MNew
BRIGHTLINE CAPITAL MANAGEMENT, LLC1.4M$36.4M−$4.06MCut−$3.96M
Verition Fund Management LLC1.3M$33.9M−$2.53MAdded$8.76M
VOYA INVESTMENT MANAGEMENT LLC1.2M$31.3M−$3.35MCut−$1.99M
GOLDMAN SACHS GROUP INC1.13M$29.5M−$1.88MAdded$10.8M
LOOMIS SAYLES & CO L P1.08M$28.2M−$3.16MCut−$4.25M
Troluce Capital Advisors LLC1M$26.1MNew
NORTHERN TRUST CORP984.1K$25.7M−$2.78MCut−$1.97M
VANGUARD FIDUCIARY TRUST CO947.5K$24.7MHeld
Bank of New York Mellon Corp908.6K$23.7M−$2.65MCut−$3.04M
TWO SIGMA INVESTMENTS, LP900.2K$23.5M−$1.86MAdded$4.98M
CACTI ASSET MANAGEMENT LLC881.7K$23M−$2.75MCut−$2.75M
MOORE CAPITAL MANAGEMENT, LP873.6K$22.8M−$1.39MAdded$9M
Nuveen, LLC871.8K$22.7M−$2.38MCut−$863K
AVENIR CORP841.1K$21.9M−$2.46MCut−$2.74M
683 Capital Management, LLC775K$20.2M−$2.26MCut−$4M
PRINCIPAL FINANCIAL GROUP INC744.7K$19.4M−$2.13MCut−$1.7M
Russell Investments Group, Ltd.713.8K$18.6M−$1.28MAdded$5.94M
Ancora Advisors LLC703.1K$18.3M−$1.17MAdded$6.67M
Penn Capital Management Company, LLC694.4K$18.2M−$2.04MCut−$3.48M
FIL Ltd652.2K$17M−$1.9MCut−$24.4M
WELLS FARGO & COMPANY/MN636.7K$16.6M−$1.36MAdded$3.13M
MILLENNIUM MANAGEMENT LLC631.1K$16.5M−$178.7KAdded$14.7M
PUBLIC SECTOR PENSION INVESTMENT BOARD549.8K$14.3M−$1.55MCut−$1.05M
ROYCE & ASSOCIATES LP549.8K$14.3M−$1.45MCut−$25.1K
Gotham Asset Management, LLC521K$13.6M−$1.52MCut−$4.84M
Icahn Capital507.8K$13.2M−$1.55MCut−$28.9M
NEW YORK STATE COMMON RETIREMENT FUND502.5K$13.1M−$1.47MCut−$2.42M
CI INVESTMENTS INC.420.1K$11M−$1.23MCut−$1.38M
Vident Advisory, LLC388.9K$10.1M−$1.12MCut−$952.1K
De Lisle Partners LLP379.8K$9.9MNew
Legacy Advisors, LLC9.06M$9.06M−$284Cut−$750.3K
Aristotle Capital Boston, LLC345K$9.02M−$987.2KCut−$1.39M
Legal & General Group Plc334.9K$8.73M−$977.9KCut−$1.96M
HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC333.8K$8.71M−$783.7KAdded$922.6K
Mawer Investment Management Ltd.333.8K$8.71MNew
SUSQUEHANNA INTERNATIONAL GROUP, LLP330K$8.61MNew
AMERIPRISE FINANCIAL INC329.7K$8.6M−$962.9KCut−$1.22M
Rovida Investment Management Ltd315K$8.21MNew
Swiss National Bank313.4K$8.17M−$910.4KCut−$868.7K
Hyperion Capital Advisors LP303.6K$7.92M−$886.4KCut−$6.35M
RHUMBLINE ADVISERS300.3K$7.83M−$851KCut−$620.2K
EXCHANGE TRADED CONCEPTS, LLC295K$7.69M−$861.4KCut−$1.31M
SEI INVESTMENTS CO294.7K$7.69M−$633.8KAdded$1.39M
GRIZZLYROCK CAPITAL, LLC289.1K$7.54M−$832.5KCut−$728.2K
California Public Employees Retirement System277.1K$7.23M−$809KCut−$855.2K
FIFTH THIRD BANCORP273.3K$7.13M−$7.56KAdded$7.05M
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC248K$6.47M−$724KCut−$870.7K
RAYMOND JAMES FINANCIAL INC245.8K$6.41M−$490.7KAdded$1.54M
FIRST NATIONAL BANK OF OMAHA248K$6.3M−$694.3KAdded$1.09M
Soviero Asset Management, LP240K$6.26M−$519.8KAdded$1.1M
AWH Capital, L.P.235.3K$6.14M−$686.9KCut−$686.9K
ROYAL BANK OF CANADA231.7K$6.04M−$676.7KCut−$1.69M
FIRST TRUST ADVISORS LP228.1K$5.95M−$666.1KCut−$5.01M
SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC217.8K$5.68M−$635.9KCut−$698.3K
Hudson Value Partners, LLC203.9K$5.32M−$601.3KCut−$186.2K
JANE STREET GROUP, LLC192K$5.01M−$31.6KAdded$4.69M
Telos Capital Management, Inc.189.9K$4.95M−$547.4KCut−$483.9K
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM184.6K$4.81M−$437.7KAdded$465.7K
Hel Ved Capital Management Ltd178.5K$4.66MNew
OpenArc Corporate Advisory, LLC170.4K$4.44M−$497.4KCut−$1.37M
OPPENHEIMER & CO INC168.9K$4.4MNew
WEDGE CAPITAL MANAGEMENT L L P/NC164.7K$4.29MNew
Quantinno Capital Management LP145.6K$3.8M−$227.7KAdded$1.54M
CenterBook Partners LP143.7K$3.75M−$419.6KCut−$2.7M
PRUDENTIAL FINANCIAL INC140.4K$3.66M−$410.1KCut−$467.8K
VANGUARD ASSET MANAGEMENT, Ltd127.8K$3.33MHeld
Holocene Advisors, LP123.2K$3.21M−$231.6KAdded$912.7K
STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM120.9K$3.15M−$352.9KCut−$352.9K
Bryn Mawr Trust Advisors, LLC116.9K$3.05M−$297.7KAdded$91.5K
Soros Fund Management107.6K$2.81M−$314.2KCut−$363.4K
STATE OF WISCONSIN INVESTMENT BOARD102K$2.66M−$297.8KCut−$347.1K
Strategic Global Advisors, LLC95.7K$2.5MNew
GAMCO INVESTORS, INC. ET AL95.3K$2.49M−$268.2KCut−$177.7K
LPL Financial LLC88.8K$2.32M−$253.1KCut−$197.8K
BOOTHBAY FUND MANAGEMENT, LLC86.2K$2.25M−$21.1KAdded$2.04M
Illinois Municipal Retirement Fund83.4K$2.18MNew
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC79.2K$2.14M−$355.4KCut−$2.77M
ALLIANCEBERNSTEIN L.P.73.8K$2.14M$0Added$73.5K
JPMORGAN CHASE & CO84.8K$2.13M−$324.7KCut−$455.7K
Citadel80.6K$2.1M−$162.3KAdded$491.1K
Qube Research & Technologies Ltd77.4K$2.02M−$225.9KCut−$2.22M
Brevan Howard Capital Management LP77.2K$2.01M−$103.1KAdded$996.9K
Mraz, Amerine & Associates, Inc.72K$1.88M−$187.5KAdded$14.8K
Oak Thistle LLC71.8K$1.87M−$96.2KAdded$915.8K
Ridge Creek Global, Inc70.5K$1.84M−$206KCut−$215.9K
Police & Firemen's Retirement System of New Jersey70.3K$1.83M−$194.6KCut−$100.1K
State of New Jersey Common Pension Fund D70.2K$1.83M−$205.1KCut−$1.04M
GABELLI FUNDS LLC69.8K$1.82M−$62.5KAdded$1.2M
JANUS HENDERSON GROUP PLC69.4K$1.81M−$205.1KCut−$205.1K
Louisiana State Employees Retirement System68.2K$1.78M−$199.1KCut−$257.1K
D. E. Shaw & Co., Inc.66.2K$1.73MNew
Creative Planning64.8K$1.69M−$130.9KAdded$389.3K
ENVESTNET ASSET MANAGEMENT INC61.6K$1.61M−$179.9KCut−$356.5K
Vanguard Global Advisers, LLC61.4K$1.6MHeld
K2 PRINCIPAL FUND, L.P.60K$1.56MNew
Crestwood Advisors Group, LLC56.8K$1.48M−$165.9KCut−$256.4K
WINTON GROUP Ltd55.5K$1.45M−$162.1KCut−$1.49M
Marex Group plc53K$1.38M−$38KAdded$1.01M
MIRABELLA FINANCIAL SERVICES LLP52.5K$1.37M−$22.8KAdded$1.14M
WOLVERINE ASSET MANAGEMENT LLC51.9K$1.35M−$151.7KCut−$618.5K
HAHN CAPITAL MANAGEMENT LLC51.1K$1.33M−$149.3KCut−$463.7K
Lido Advisors, LLC50.3K$1.31M$20.7KAdded$1.08M
Advisors Asset Management, Inc.50K$1.3M−$61.5KAdded$693.5K
VICTORY CAPITAL MANAGEMENT INC49.8K$1.3M−$137.2KCut−$63.4K
BLAIR WILLIAM & CO/IL49.3K$1.29M−$144KCut−$1.03M
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO47.8K$1.25M−$139.7KCut−$180K
BARCLAYS PLC46.8K$1.22M−$136.7KCut−$239.9K
MAVERICK CAPITAL LTD46.3K$1.21MNew
State of Tennessee, Department of Treasury46.3K$1.21M−$448.7KCut−$448.7K
Hikari Tsushin, Inc.45.4K$1.18M−$132.6KCut−$132.6K
Steadtrust LLC45.4K$1.18M−$132.6KCut−$277.6K
ARIZONA STATE RETIREMENT SYSTEM43.5K$1.14M−$127.1KCut−$136.4K
Dynamic Technology Lab Private Ltd43.2K$1.13M−$90.1KAdded$232.8K
Paragon Capital Management LLC43.2K$1.13M−$126KCut−$142.6K
CWM, LLC42.6K$1.11M$1.11MAdded$1.11M
Cerity Partners LLC42.4K$1.11M−$123.9KCut−$392.1K
Zurcher Kantonalbank (Zurich Cantonalbank)41K$1.07M−$97.6KAdded$98.6K
MANUFACTURERS LIFE INSURANCE COMPANY, THE40.9K$1.07M−$107.8KCut−$3.54K
CITIGROUP INC40.7K$1.06M−$118.8KCut−$1.23M
LANDSCAPE CAPITAL MANAGEMENT, L.L.C.40.4K$1.05M−$96.3KAdded$97K
Vanguard Investments Australia, Ltd.39.5K$1.03MHeld
COMMONWEALTH OF PENNSYLVANIA PUBLIC SCHOOL EMPLS RETRMT SYS38K$991.1K−$110.8KCut−$109.4K
YOUSIF CAPITAL MANAGEMENT, LLC37.9K$987.2K−$314.5KCut−$322.8K
JONES FINANCIAL COMPANIES LLLP37.7K$973.6K−$114.6KCut−$78.7K
NISA INVESTMENT ADVISORS, LLC36.2K$944.9K−$104.4KCut−$92.1K
TOWER BRIDGE ADVISORS35.7K$931K−$99.8KCut−$60.3K
WEXFORD CAPITAL LP35.5K$925.5K−$24.1KAdded$686.2K
OREGON PUBLIC EMPLOYEES RETIREMENT FUND35.1K$915.4K−$102.5KCut−$102.5K
Universal- Beteiligungs- und Servicegesellschaft mbH34.6K$903.4K−$97KCut−$60.1K
Clear Harbor Asset Management, LLC33.8K$880.9K−$98.6KCut−$171.1K
FOX RUN MANAGEMENT, L.L.C.33.9K$854.2K−$27.8KAdded$644.1K
Williams Jones Wealth Management, LLC.32.5K$848K−$94.9KCut−$181.3K
CAPTRUST FINANCIAL ADVISORS31.9K$832.2K−$93.7KCut−$93.9K
DBA TRADING, LLC31.2K$813.6K−$91.1KCut−$91.1K
Maryland State Retirement & Pension System29.8K$778.2K−$87.1KCut−$89.3K
Corient Private Wealth LLC29.5K$768.7K−$89.6KCut−$305.1K
Kerrisdale Advisers, LLC29.2K$761.3KNew
Wilmington Savings Fund Society, FSB29.1K$759.9K−$78.5KCut−$19.3K
Legal Advantage Investments, Inc.28.9K$753.7K−$55.2KAdded$205.6K
Walleye Trading LLC28.5K$744.5KNew
OPPENHEIMER ASSET MANAGEMENT INC.28.2K$734.3KNew
PICTON MAHONEY ASSET MANAGEMENT27.2K$710.3K−$23Added$710.1K
National Philanthropic Trust27.1K$705.9K−$79KCut−$89.8K
OSAIC HOLDINGS, INC.27.1K$705.8K−$79.1KCut−$138.9K
Entropy Technologies, LP26.9K$701.4KNew
Pictet Asset Management Holding SA26.9K$701.4K−$73.7KCut−$30.9K
SECURITY NATIONAL BANK OF SO DAK26.1K$681.4K−$76.3KCut−$91.2K
Cetera Investment Advisers24.4K$635.7K−$62.1KAdded$18.8K
US BANCORP \DE\24.3K$633.1K−$70.9KCut−$109.3K
Peak Asset Management, LLC24K$625.9K−$70.1KCut−$70.1K
XTX Topco Ltd23.8K$620.4K−$69.5KCut−$679.4K
STEPHENS INC /AR/23.4K$610.1K−$65.9KCut−$44K
Atom Investors LP22.8K$595K−$66.6KCut−$673.4K
TOTH FINANCIAL ADVISORY CORP22.4K$583K−$45.8KAdded$128K
STIFEL FINANCIAL CORP21.9K$572.1K−$64.1KCut−$314K
Pathstone Holdings, LLC21.8K$568.4K−$63.6KCut−$357.5K
Old West Investment Management, LLC21.8K$567.7K−$56.5KAdded$6.39K
Caption Management, LLC21.7K$566.5K−$63.4KCut−$2.81M
DOVER ADVISORS, LLC21.2K$551.9K−$61.8KCut−$92.5K
Massar Capital Management, LP21.1K$549.1KNew
ARISTEIA CAPITAL, L.L.C.20.6K$537.4KNew
NEUBERGER BERMAN GROUP LLC20.6K$536K−$55.1KCut−$11.4K
BANK OF MONTREAL /CAN/20K$520.7K−$56.7KCut−$42.1K
DEUTSCHE BANK AG\19.9K$517.8K−$58KCut−$96.3K
Moran Wealth Management, LLC19.6K$510.8KNew
ALLSTATE CORP19.5K$507.8KNew
CLIFFORD SWAN INVESTMENT COUNSEL LLC19.2K$501.1K−$56.1KCut−$60.2K
Gryphon Financial Partners LLC18.9K$492.5K−$47.6KAdded$20.2K
HighTower Advisors, LLC18.6K$485.4K−$42.8KAdded$60.9K
CIBC Asset Management Inc18.4K$480.8K−$53.8KCut−$66.9K
Modera Wealth Management, LLC18.4K$479.9K−$53.7KCut−$156.5K
Balyasny Asset Management L.P.18.3K$478.4K−$53.6KCut−$7.29M
GUIDANCE CAPITAL, INC19.5K$473.5KNew
EntryPoint Capital, LLC18K$468.9KNew
SECURITY NATIONAL BANK OF SIOUX CITY IOWA /IA/17.8K$463.2K−$51.9KCut−$96.2K
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC17.6K$458.7K−$51.2KCut−$49.4K
COMMONWEALTH EQUITY SERVICES, LLC17.5K$455.9K−$48.2KCut−$22.9K
Bridgewater17.1K$444.7K−$49.8KCut−$84.6K
Aigen Investment Management, LP16.9K$441.2KNew
LEAVELL INVESTMENT MANAGEMENT, INC.16.6K$433.9K−$47.1KCut−$34.1K
Swiss Life Asset Management Ltd16.5K$430.8K−$20.7KAdded$225.3K
Vanguard Personalized Indexing Management, LLC16.5K$430.1K−$48.2KCut−$84.7K
TRUIST FINANCIAL CORP16.4K$427.4K−$47.9KCut−$109.7K
Heritage Wealth Advisors16.3K$426.4KNew
MACKENZIE FINANCIAL CORP16.3K$424.3K−$48.9KCut−$28.3K
MERCER GLOBAL ADVISORS INC /ADV15.5K$403.6K−$48.2KCut−$49.1K
BCS Private Wealth Management, Inc.14.6K$381.4K−$35KAdded$33.4K
Sterling Capital Management LLC14.4K$375.8K−$42.1KCut−$134K
Tidal Investments LLC14.3K$373.7K−$41.8KCut−$611.1K
FIRST MANHATTAN CO. LLC.14.1K$368.2K−$41.2KCut−$41.2K
Summit Trail Advisors, LLC14K$364.1K−$21.7KAdded$148.3K
Intrinsic Value Partners, LLC13.9K$362.5K−$40.6KCut−$121.2K
PNC Financial Services Group, Inc.13.7K$356.6K−$36.9KCut−$9.45K
QUADRANT CAPITAL GROUP LLC13.6K$354K−$38.1KCut−$24.6K
DAVENPORT & Co LLC13.6K$353.6K−$36.4KCut−$7.69K
Formidable Asset Management, LLC13.5K$351.4K−$20.9KAdded$143.6K
First Bank & Trust13.4K$350K−$39.2KCut−$60.9K
Granite Investment Partners, LLC13.2K$345.5K−$38.7KCut−$38.7K
First National Advisers, LLC12.7K$332.3KNew
Lighthouse Investment Partners, LLC12.1K$315.5KNew
CAHABA WEALTH MANAGEMENT, INC.12.1K$314.9K−$35.3KCut−$35.3K
FRANKLIN RESOURCES INC11.8K$309K−$34.6KCut−$37.1K
CANADA PENSION PLAN INVESTMENT BOARD11.6K$302.4K−$33.9KCut−$654.5K
XPONANCE LLC11.5K$299.4K−$24.6KAdded$54.7K
Caldwell Investment Management Ltd.11.7K$294.1K−$47.6KCut−$47.6K
NATIONAL BANK OF CANADA /FI/10.9K$283.6K−$3.01KAdded$253.6K
SHUFRO ROSE & CO LLC10.7K$280K−$31.4KCut−$35.2K
Advyzon Investment Management, LLC10.4K$270K−$30.2KCut−$86K
PFG Investments, LLC10.3K$269.5K−$27.5KCut−$3.81K
Allworth Financial LP10K$260.9K−$28.8KCut−$24.7K
BROWN ADVISORY INC9.93K$258.9K−$29KCut−$29.6K
SFMG, LLC9.79K$255.2K−$28.5KCut−$28.2K
TEACHER RETIREMENT SYSTEM OF TEXAS9.73K$253.8K−$28.4KCut−$785.3K
WEATHERLY ASSET MANAGEMENT L. P.9.69K$252.7KNew
M&T Bank Corp9.57K$249.7K−$27.9KCut−$42.2K
IHT Wealth Management, LLC9.54K$248.7KNew
DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main9.5K$247.8KNew
DRW Securities, LLC9.41K$245.5KNew
Ensign Peak Advisors, Inc9.39K$244.8K−$27.4KCut−$27.4K
AE Wealth Management LLC9.24K$241KNew
EVERGREEN CAPITAL MANAGEMENT LLC9.1K$237.4K−$26.6KCut−$145.2K
Vann Equity Management LLC9.02K$235.2KHeld
SYON CAPITAL LLC8.81K$229.9K−$25.5KCut−$23.2K
Aberdeen Wealth Management LLC8.64K$225.3K−$25.2KCut−$25.3K
SILVERCREST ASSET MANAGEMENT GROUP LLC8.52K$222.1K−$24.9KCut−$24.9K
ALPINE WOODS CAPITAL INVESTORS, LLC8.4K$219.1KNew
Utah Retirement Systems8.34K$217.5K−$24.3KCut−$24.4K

Who left

Positions as of Q1 2026. 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.