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Amentum Holdings, Inc. hedge fund holdings

AMTMNYSE
$18.14-0.34 (-1.84% today)

Every quarter, large institutional investment managers with over $100M in U.S.-listed assets under management disclose their U.S. equity holdings through 13F filings. Read together, those filings show which businesses professional capital is moving into and out of.

Price vs funds buying and selling

AMTM · close · 13FReported Aug 14, 2026

Price vs funds buying and selling data

Showing the 1Y range: Oct 2, 2025 to Oct 2, 2026. Price (-27.9%). 0 fund reports plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
DateCategoryPersonRoleActionAmountChange in holding
Funds buying · new + increased
Funds selling · reduced + closed
Net buyers vs sellers
Buying = new + increased; selling = reduced + closed. Counts exclude position changes under 5% of the fund's holding last quarter.

Price and fund activity data

Quarterly 13F fund buying and selling activity
QuarterFunds buyingFunds sellingBoughtSoldFilersReported
Q2 2025257128$504M$311M431Aug 14, 2025
Q3 2025130174$333M$439M434Nov 14, 2025
Q4 2025154146$380M$478M455Feb 14, 2026
Q1 2026152137$480M$261M461May 15, 2026
Q2 2026141157$482M$323M425Aug 14, 2026

Quarterly action breakdown

Q2 2026
425 filers
New position
39
$28.6M+1.38M sh
Increased
102
$454M+22M sh
Reduced
91
-$241M-11.7M sh
Out / sold
66
-$82.2M-3.98M sh
Last 4 quarters · free
Reported Aug 14, 2026
FundActionChange in dollarValue% of portfolioReported
Troluce Capital Advisors LLCAdded 256.54%+$53M$73.7M7.59%Aug 14, 2026
Brightline Capital Management, LLCSell 100%-$36.4M$00.00%Aug 14, 2026
Arvin Capital Management LPReduce 79.88%-$34.2M$8.61M1.12%Aug 13, 2026
Van Eck Associates CorpAdded 263.17%+$29.8M$41.1M0.03%Aug 14, 2026
Ruane, Cunniff & Goldfarb L.P.Reduce 66.90%-$22.4M$11.1M0.17%Aug 14, 2026
Penn Capital Management Company, LLCSell 100%-$18.2M$00.00%Jul 30, 2026
Frontier Capital Management Co LLCReduce 15.95%-$16.3M$85.7M0.80%Aug 14, 2026
Thompson Siegel & Walmsley LLCAdded 49.55%+$15.6M$47.2M0.85%Aug 11, 2026
FIL LtdReduce 99.79%-$13.5M$28.4K0.00%Aug 13, 2026
Shapiro Capital Management LLCNew Buy+$9.84M$9.84M0.60%Aug 6, 2026
Segra Capital Management, LLCAdded 26.36%+$8.79M$42.1M8.50%Aug 12, 2026
Hyperion Capital Advisors LPSell 100%-$7.92M$00.00%Aug 14, 2026
Gotham Asset Management, LLCReduce 70.04%-$7.54M$3.23M0.01%Aug 14, 2026
683 Capital Management, LLCAdded 41.94%+$6.72M$22.7M1.12%Aug 14, 2026
First Trust Advisors LPAdded 140.22%+$6.61M$11.3M0.01%Aug 11, 2026
AWH Capital, L.P.Added 100.00%+$4.86M$9.73M3.37%Aug 17, 2026
Primecap Management CoAdded 1.66%+$4.14M$254M0.15%Aug 14, 2026
Verbena Value LPNew Buy+$3.85M$3.85M0.64%Aug 14, 2026
CenterBook Partners LPAdded 128.79%+$3.83M$6.8M0.33%Aug 11, 2026
Susquehanna Fundamental Investments, LLCAdded 81.09%+$3.65M$8.15M0.15%Aug 14, 2026
CSM Advisors, LLCAdded 200.11%+$3.36M$5.04M0.11%Aug 14, 2026
Permian Investment Partners, LPReduce 8.55%-$2.77M$29.6M3.25%Aug 14, 2026
Oak Thistle LLCSell 100%-$1.87M$00.00%Jul 21, 2026
Soviero Asset Management, LPReduce 37.50%-$1.86M$3.1M1.30%Aug 14, 2026
K2 Principal Fund, L.P.Sell 100%-$1.56M$00.00%Aug 7, 2026
Cascade Investment Advisors, Inc.New Buy+$1.5M$1.5M0.82%Jul 15, 2026
Hotchkis & Wiley Capital Management LLCAdded 20.47%+$1.41M$8.31M0.02%Aug 14, 2026
Maverick Capital LtdSell 100%-$1.21M$00.00%Aug 14, 2026
Quantinno Capital Management LPReduce 31.95%-$961K$2.05M0.00%Aug 13, 2026
Hudson Value Partners, LLCAdded 22.69%+$957K$5.17M1.30%Jul 10, 2026
Harbor Capital Advisors, Inc.New Buy+$816K$816K0.06%Aug 7, 2026
Loomis Sayles & Co L PReduce 3.59%-$802K$21.5M0.03%Aug 14, 2026
Aristotle Capital Boston, LLCReduce 10.77%-$768K$6.36M0.43%Aug 14, 2026
Axq Capital, LPNew Buy+$742K$742K0.08%Aug 6, 2026
Mawer Investment Management Ltd.Added 10.72%+$739K$7.64M0.05%Aug 7, 2026
Hel Ved Capital Management LtdAdded 19.89%+$734K$4.42M0.33%Aug 14, 2026
Holocene Advisors, LPReduce 27.73%-$706K$1.84M0.00%Aug 14, 2026
Lebenthal Global Advisors, LLCNew Buy+$682K$682K0.09%Jul 30, 2026
Marco Investment Management LLCNew Buy+$649K$649K0.04%Aug 3, 2026
Kerrisdale Advisers, LLCAdded 105.02%+$634K$1.24M0.31%Aug 14, 2026
First National Advisers, LLCAdded 238.09%+$627K$890K0.13%Jul 21, 2026
Bridgewater Associates, LPAdded 176.94%+$624K$976K0.00%Aug 14, 2026
Grizzlyrock Capital, LLCAdded 10.12%+$605K$6.58M4.60%Aug 14, 2026
Jain Global LLCNew Buy+$569K$569K0.00%Aug 14, 2026
Picton Mahoney Asset ManagementReduce 99.12%-$558K$4.96K0.00%Aug 13, 2026
Massar Capital Management, LPSell 100%-$549K$00.00%Aug 14, 2026
Aristeia Capital, L.L.C.Sell 100%-$537K$00.00%Aug 14, 2026
Oppenheimer & Co IncReduce 15.34%-$535K$2.96M0.03%Aug 3, 2026
State of Alaska, Department of RevenueReduce 33.18%-$520K$1.05M0.01%Jul 20, 2026
Bryn Mawr Trust Advisors, LLCAdded 21.02%+$508K$2.92M0.13%Aug 3, 2026
Allstate CorpSell 100%-$508K$00.00%Aug 13, 2026
Feynman Point Asset Management LLCNew Buy+$498K$498K0.91%Aug 14, 2026
Modera Wealth Management, LLCSell 100%-$480K$00.00%Aug 3, 2026
Wedge Capital Management L L PAdded 14.07%+$479K$3.88M0.06%Jul 10, 2026
Fox Run Management, L.L.C.Added 67.08%+$471K$1.17M0.19%Aug 4, 2026
EntryPoint Capital, LLCSell 100%-$469K$00.00%Aug 13, 2026
Blair William & CoReduce 44.67%-$455K$564K0.00%Aug 11, 2026
Grantham, Mayo, Van Otterloo & Co. LLCNew Buy+$446K$446K0.00%Aug 13, 2026
Aigen Investment Management, LPSell 100%-$441K$00.00%Aug 14, 2026
Public Sector Pension Investment BoardReduce 3.82%-$434K$10.9M0.03%Aug 13, 2026
BCS Private Wealth Management, Inc.Sell 100%-$381K$00.00%Jul 31, 2026
Mraz, Amerine & Associates, Inc.Added 25.30%+$377K$1.86M0.27%Jul 16, 2026
Delphi Management IncAdded 46.46%+$364K$1.15M1.12%Jul 31, 2026
DAVENPORT & Co LLCSell 100%-$354K$00.00%Jul 13, 2026
Elo Mutual Pension Insurance CoNew Buy+$331K$331K0.00%Aug 13, 2026
Vident Advisory, LLCReduce 4.10%-$330K$7.71M0.06%Aug 12, 2026
Lighthouse Investment Partners, LLCSell 100%-$316K$00.00%Aug 14, 2026
Steadtrust LLCReduce 33.04%-$310K$628K0.32%Jul 9, 2026
Canada Pension Plan Investment BoardSell 100%-$302K$00.00%Aug 14, 2026
Caldwell Investment Management Ltd.Sell 100%-$294K$00.00%Aug 11, 2026
Wexford Capital LPAdded 34.90%+$256K$989K0.13%Aug 14, 2026
111 CapitalNew Buy+$243K$243K0.04%Aug 5, 2026
Evergreen Capital Management LLCSell 100%-$237K$00.00%Jul 23, 2026
Vann Equity Management LLCSell 100%-$235K$00.00%Aug 5, 2026
Syon Capital LLCSell 100%-$230K$00.00%Aug 14, 2026
Old West Investment Management, LLCAdded 51.03%+$230K$680K0.07%Aug 6, 2026
Silvercrest Asset Management Group LLCSell 100%-$222K$00.00%Aug 14, 2026
Soros Fund Management LLCAdded 9.92%+$221K$2.44M0.03%Aug 14, 2026
Alpine Woods Capital Investors, LLCSell 100%-$219K$00.00%Aug 7, 2026
Utah Retirement SystemsSell 100%-$217K$00.00%Aug 14, 2026
Lecap Asset Management LtdNew Buy+$214K$214K0.09%Jul 30, 2026
Exchange Traded Concepts, LLCAdded 3.48%+$212K$6.31M0.03%Aug 11, 2026
Pine Valley Investments Ltd Liability CoAdded 12.88%+$211K$1.85M0.07%Jul 24, 2026
Badgley Phelps Wealth Managers, LLCSell 100%-$210K$00.00%Jul 31, 2026
Lido Advisors, LLCReduce 19.93%-$207K$833K0.00%Aug 7, 2026
Cinctive Capital Management LPNew Buy+$207K$207K0.01%Aug 14, 2026
Empowered Funds, LLCSell 100%-$206K$00.00%Aug 17, 2026
Strategic Equity ManagementSell 100%-$205K$00.00%Aug 10, 2026
Caprock Group, LLCSell 100%-$205K$00.00%Jul 27, 2026
Xcelsior Advisor Partners LLCNew Buy+$202K$202K0.03%Aug 14, 2026
State of New Jersey Common Pension Fund DReduce 13.10%-$190K$1.26M0.00%Aug 4, 2026
Weatherly Asset Management L. P.Added 92.47%+$185K$385K0.03%Jul 20, 2026
Machina Capital S.A.S.Added 101.41%+$174K$345K0.05%Aug 10, 2026
Leavell Investment Management, Inc.Added 48.22%+$166K$510K0.02%Jul 21, 2026
Tidal Investments LLCAdded 54.02%+$160K$456K0.00%Aug 13, 2026
Summit Trail Advisors, LLCAdded 44.89%+$130K$418K0.01%Aug 11, 2026
Natixis Advisors, LLCReduce 11.17%-$126K$998K0.00%Aug 14, 2026
Swiss Life Asset Management LtdReduce 36.75%-$125K$216K0.00%Jul 29, 2026
Thrivent Financial for LutheransAdded 0.25%+$110K$43.5M0.07%Aug 14, 2026
De Lisle Partners LLPReduce 1.32%-$103K$7.74M0.85%Aug 12, 2026

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