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Amentum Holdings, Inc.

AMTM
Exchange
NYSE
Industry
Services-Business Services, NEC
SEC CIK
0002011286

No open-market purchases or sales by Amentum Holdings, Inc. insiders were filed in the last 90 days; 464 institutions reported holding it in 13F filings for Q2 2026, worth $4.34B in total; Soros Fund Management is the only superinvestor holding it.

Q2 2026 vs. Q1 2026

How the institutions holding Amentum Holdings, Inc. changed between Q1 2026 and Q2 2026.

All holders in Q2 2026All holders in Q1 2026

13F holders of AMTM: Q1 2026 compared with Q2 2026
MeasureQ1 2026Of which not filed for Q2 2026Q2 2026Change
Holders4867464−15
Shares211.1M120.1K218.9M+7.93M (+3.8%)
Value$5.28B$3.13M$4.34B−$931.8M (−17.7%)

7 institutions that held it in Q1 2026 haven't filed for Q2 2026 yet. Not filing isn't selling, so the changes leave them out.

New holders (59)

Institutions that held Amentum Holdings, Inc. at the end of Q2 2026 but not at the end of Q1 2026.

Institutions new to AMTM in Q2 2026
InstitutionSharesValue% of portfolio
Norges Bank1,516,193$31.3M0.00%
HRT Financial LP671,847$13.9M0.03%
Loews Corp500,000$10.3M0.08%
Shapiro Capital Management LLC475,970$9.84M0.60%
ExodusPoint Capital Management, LP226,289$4.68M0.04%
Verbena Value LP186,200$3.85M0.64%
Twinbeech Capital LP99,727$2.06M0.37%
Cascade Investment Advisors, Inc.72,340$1.50M0.82%
Jupiter Topco LLC69,400$1.43M0.00%
Natixis67,073$1.39M0.01%
Intech Investment Management LLC48,767$1.01M0.01%
Harbor Capital Advisors, Inc.39,501$816.0K0.06%
Axq Capital, LP35,915$742.4K0.08%
Lebenthal Global Advisors, LLC33,000$682.1K0.09%
Marco Investment Management LLC31,391$648.9K0.04%
Blackstone Group Inc.31,027$641.3K0.00%
Group One Trading, L.P.27,710$572.8K0.02%
Jain Global LLC27,519$568.8K0.01%
Ameritas Advisory Services, LLC26,747$552.9K0.01%
Feynman Point Asset Management LLC24,075$497.6K0.91%
HSBC Holdings PLC22,218$460.1K0.00%
Grantham, Mayo, Van Otterloo & Co. LLC21,601$446.5K0.00%
Hancock Whitney Corp18,236$376.9K0.01%
Shay Capital LLC17,500$361.7K0.04%
Simplex Trading, LLC17,003$351.5K0.01%
Elo Mutual Pension Insurance Co16,030$331.3K0.00%
Sanctuary Advisors, LLC15,732$325.2K0.00%
Mitsubishi UFJ Trust & Banking Corp12,499$258.4K0.00%
111 Capital11,779$243.5K0.04%
Lecap Asset Management Ltd10,370$214.3K0.09%
Cinctive Capital Management LP10,000$206.7K0.01%
Excelsior Advisor Network LLC9,779$202.1K0.03%
New Age Alpha Advisors, LLC4,015$83.0K0.00%
McDonald Partners LLC3,092$63.9K0.02%
Nykredit A/S1,800$37.2K0.00%
Global Retirement Partners, LLC1,484$30.7K0.00%
Salem Investment Counselors Inc1,082$22.4K0.00%
Elequin Capital LP833$17.2K0.00%
Axiom Investment Management LLC530$11.0K0.01%
Kemnay Advisory Services Inc.313$6.47K0.00%
ZRC Wealth Management, LLC199$4.11K0.00%
Brooklyn FI, LLC135$2.89K0.00%
Evolution Wealth Management Inc.88$1.82K0.00%
NBH Bank78$1.61K0.00%
Action Point Financial Planning, LLC47$9090.00%
Creative Capital Management Investments LLC38$7850.00%
Plante Moran Financial Advisors, LLC34$7030.00%
Bokf, NA33$6820.00%
LifeSteps Financial, Inc.30$6200.00%
First Pacific Financial26$5380.00%
Financial Gravity Companies, Inc.24$4960.00%
Silver Grove Financial Group, Inc.17$3510.00%
Compagnie Lombard Odier SCmA15$3100.00%
Davis Capital Management8$1650.00%
Maryland Capital Advisors Inc.4$830.00%
DecisionPoint Financial, LLC4$810.00%
Bay Harbor Wealth Management, LLC3$620.00%
Raffa Wealth Management, LLC2$410.00%
Institute for Wealth Management, LLC.0$50.00%

Sold out (74)

Institutions that held Amentum Holdings, Inc. at the end of Q1 2026 and filed for Q2 2026 without it.

Institutions that sold out of AMTM in Q2 2026
InstitutionShares, Q1 2026Value, Q1 2026
Toronto Dominion Bank1,565,223$40.8M
Brightline Capital Management, LLC1,396,000$36.4M
Cooper Creek Partners Management LLC929,334$24.2M
Penn Capital Management Co Inc694,352$18.2M
Ci Investments Inc.420,068$11.0M
Hyperion Capital Advisors LP303,576$7.92M
Oak Thistle LLC71,759$1.87M
K2 Principal Fund, L.P.60,000$1.56M
Marex Group plc53,043$1.38M
Mirabella Financial Services LLP52,498$1.37M
Maverick Capital LtdSuperinvestorMaverick Capital46,335$1.21M
Landscape Capital Management, L.L.C.40,393$1.05M
Walleye Trading LLC28,548$744.5K
Stifel Financial Corp21,935$572.1K
Massar Capital Management, LP21,056$549.1K
Aristeia Capital LLC20,605$537.4K
Allstate Corp19,471$507.8K
Modera Wealth Management, LLC18,402$479.9K
EntryPoint Capital, LLC17,978$468.9K
Aigen Investment Management, LP16,916$441.2K
Mackenzie Financial Corp16,270$424.3K
BCS Private Wealth Management, Inc.14,624$381.4K
Davenport & Co LLC13,558$353.6K
Lighthouse Investment Partners, LLC12,099$315.5K
Canada Pension Plan Investment Board11,594$302.4K
Caldwell Investment Management Ltd.11,669$294.1K
Brown Advisory Inc9,928$258.9K
M&T Bank Corp9,610$250.7K
IHT Wealth Management, LLC9,537$248.7K
DRW Securities, LLC9,412$245.5K
Evergreen Capital Management LLC9,103$237.4K
Vann Equity Management LLC9,018$235.2K
Syon Capital LLC8,814$229.9K
Silvercrest Asset Management Group LLC8,515$222.1K
Alpine Woods Capital Investors, LLC8,402$219.1K
Utah Retirement Systems8,339$217.5K
Badgley Phelps Wealth Managers, LLC8,038$209.6K
Empowered Funds, LLC7,900$206.0K
Strategic Equity Management7,844$204.6K
CAPROCK Group, Inc.7,842$204.5K
MAI Capital Management6,094$158.9K
Acadian Asset Management LLC5,957$155.0K
PEAK6 LLC2,783$72.6K
Nomura Asset Management Co Ltd2,700$70.4K
Advisory Services Network, LLC2,586$67.4K
Sound Income Strategies, LLC1,361$35.8K
Spire Wealth Management846$22.1K
Root Financial Partners, LLC773$20.2K
First Command Advisory Services, Inc.695$18.1K
MBM Wealth Consultants, LLC678$17.7K
Global Wealth Strategies & Associates493$12.9K
Golden State Equity Partners357$9.31K
Twin Peaks Wealth Advisors, LLC339$8.84K
DT Investment Partners, LLC230$6.00K
Intentional Wealth Strategies, LLC210$5.48K
Medallion Wealth Advisors, LLC180$4.69K
Cassaday & Co Wealth Management LLC164$4.28K
Bayban81$2.11K
Bank of Jackson Hole Trust78$2.03K
Meramec Financial Planners, LLC61$1.69K
Aventus Investment Advisors, Inc.59$1.54K
Synergy Investment Management, LLC52$1.36K
Clayton Financial Group LLC27$705
Cornerstone Financial Management LLC16$417
Hilltop National Bank15$391
NBT Bank N A12$313
Vermillion Wealth Management, Inc.11$287
Annis Gardner Whiting Capital Advisors, LLC10$261
Kayne Anderson Rudnick Investment Management LLC8$209
SHP Wealth Management5$130
Signature Equity Partners, LLC2$52
Lloyd Advisory Services, LLC.1$26
Scarborough Advisors, LLC1$26
Kingdom Financial Group LLC.1$26

Not filed for Q2 2026 yet (7)

Institutions that held Amentum Holdings, Inc. at the end of Q1 2026 and haven't filed a 13F for Q2 2026. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding AMTM in Q1 2026 that haven't filed for Q2 2026
InstitutionShares, Q1 2026Value, Q1 2026
Janus Henderson Group PLC69,400$1.81M
CWM, LLC42,637$1.11M
FRG Family Wealth Advisors LLC7,831$204.2K
McIlrath & Eck, LLC136$3.55K
Sofos Investments, Inc.24$626
Red Tortoise LLC23$600
Sunbelt Securities, Inc.1$26