Amentum (AMTM) Institutional Ownership

$22.80 -0.49 (-2.10%)

Closing price 03:59 PM Eastern

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$22.75 -0.05 (-0.23%)

As of 07:58 PM Eastern

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Current Institutional Ownership Percentage: 39.93%
Number of Institutional Buyers (last 12 months): 263
Total Institutional Inflows (last 12 months): $1.40B

Number of Institutional Sellers (last 12 months): 136
Total Institutional Outflows (last 12 months): $539.28M

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AMTM Institutional Buying and Selling by Quarter

Amentum Major Shareholders & Ownership History

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Reporting Date	Major Shareholder Name	Shares Held	Market Value	% of Portfolio	Quarterly Change in Shares	Ownership in Company
5/27/2026	Alpine Woods Capital Investors LLC	8,402	$219K	0.1%	N/A	0.003%
5/19/2026	Western Wealth Management LLC	1,252	$33K	0.0%	N/A	0.001%
5/19/2026	Rovida Investment Management Ltd	315,000	$8.21M	1.0%	N/A	0.129%
5/19/2026	Bank of America Corp DE	2,405,041	$62.72M	0.0%	+107.8%	0.984%
5/18/2026	California State Teachers Retirement System	184,555	$4.81M	0.0%	+23.1%	0.076%
5/18/2026	Royal Bank of Canada	231,742	$6.04M	0.0%	-13.1%	0.095%
5/18/2026	Ruane Cunniff & Goldfarb L.P.	1,622,982	$42.33M	0.7%	-32.2%	0.664%
5/18/2026	Empowered Funds LLC	7,900	$206K	0.0%	N/A	0.003%
5/16/2026	The Manufacturers Life Insurance Company	40,917	$1.07M	0.0%	+10.8%	0.017%
5/16/2026	Maverick Capital Ltd.	46,335	$1.21M	0.0%	N/A	0.019%
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5/16/2026	Quantinno Capital Management LP	145,574	$3.80M	0.0%	+86.7%	0.060%
5/15/2026	Troluce Capital Advisors LLC	1,000,000	$26.08M	1.6%	N/A	0.409%
5/15/2026	Entropy Technologies LP	26,895	$701K	0.0%	N/A	0.011%
5/14/2026	Gabelli Funds LLC	69,783	$1.82M	0.0%	+226.3%	0.029%
5/14/2026	Gamco Investors INC. ET AL	95,331	$2.49M	0.0%	+3.8%	0.039%
5/14/2026	Public Employees Retirement System of Ohio	47,842	$1.25M	0.0%	-2.8%	0.020%
5/14/2026	Sei Investments Co.	294,668	$7.69M	0.0%	+35.8%	0.121%
5/14/2026	State of Wyoming	8,302	$217K	0.0%	-30.3%	0.003%
5/13/2026	Cetera Investment Advisers	24,375	$636K	0.0%	+14.6%	0.010%
5/13/2026	CI Investments Inc.	420,068	$10.96M	0.1%	-1.3%	0.172%
5/13/2026	First Trust Advisors LP	228,083	$5.95M	0.0%	-39.6%	0.094%
5/8/2026	PNC Financial Services Group Inc.	13,674	$357K	0.0%	+8.3%	0.006%
5/7/2026	Dimensional Fund Advisors LP	3,787,420	$98.77M	0.0%	+106.6%	1.553%
5/7/2026	Hahn Capital Management LLC	51,120	$1.33M	0.8%	-17.5%	0.021%
5/7/2026	KBC Group NV	5,431	$142K	0.0%	-7.1%	0.002%
5/7/2026	Swiss National Bank	313,391	$8.17M	0.0%	+0.5%	0.128%
5/6/2026	California Public Employees Retirement System	277,052	$7.23M	0.0%	-0.6%	0.114%
5/6/2026	Gryphon Financial Partners LLC	18,883	$492K	0.1%	+16.0%	0.008%
5/6/2026	Modera Wealth Management LLC	18,402	$480K	0.0%	-16.1%	0.008%
5/6/2026	Bessemer Group Inc.	125,952	$3.28M	0.0%	+7,142.8%	0.052%
5/5/2026	Bank of New York Mellon Corp	908,599	$23.70M	0.0%	-1.5%	0.372%
5/5/2026	Illinois Municipal Retirement Fund	83,407	$2.18M	0.0%	N/A	0.034%
5/5/2026	NFSG Corp	1,350	$35K	0.0%	N/A	0.001%
5/4/2026	Bryn Mawr Trust Advisors LLC	116,871	$3.05M	0.1%	+14.6%	0.048%
5/4/2026	Principal Financial Group Inc.	744,728	$19.42M	0.0%	+2.2%	0.305%
5/1/2026	Fifth Third Bancorp	273,316	$7.13M	0.0%	+10,456.8%	0.112%
4/28/2026	Intrinsic Value Partners LLC	13,899	$362K	0.3%	-16.7%	0.006%
4/28/2026	Stephens Inc. AR	23,395	$610K	0.0%	+3.7%	0.010%
4/27/2026	Moran Wealth Management LLC	19,585	$511K	0.0%	N/A	0.008%
4/27/2026	PFG Investments LLC	10,332	$269K	0.0%	+9.6%	0.004%
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4/27/2026	New York State Teachers Retirement System	165,329	$4.31M	0.0%	-0.4%	0.068%
4/23/2026	Formidable Asset Management LLC	13,473	$351K	0.1%	+88.1%	0.006%
4/22/2026	Janney Montgomery Scott LLC	12,728	$332K	0.0%	N/A	0.005%
4/22/2026	Pictet Asset Management Holding SA	26,893	$701K	0.0%	+6.5%	0.011%
4/22/2026	Sterling Capital Management LLC	14,408	$376K	0.0%	-18.0%	0.006%
4/21/2026	Louisiana State Employees Retirement System	68,200	$1.78M	0.0%	N/A	0.028%
4/20/2026	Delphi Management Inc. MA	37,873	$988K	1.2%	-22.9%	0.016%
4/20/2026	Legal Advantage Investments Inc.	28,900	$754K	0.4%	+52.9%	0.012%
4/17/2026	Telos Capital Management Inc.	189,901	$4.95M	0.5%	+1.3%	0.078%
4/16/2026	SG Americas Securities LLC	274,602	$7.16M	0.0%	-20.5%	0.113%
4/15/2026	Weatherly Asset Management L. P.	9,690	$253K	0.0%	N/A	0.004%
3/17/2026	Rockefeller Capital Management L.P.	4,412	$128K	0.0%	-22.5%	0.002%
3/9/2026	Corient Private Wealth LLC	36,949	$1.07M	0.0%	-5.4%	0.015%
2/26/2026	Alpine Global Management LLC	25,000	$725K	0.1%	-66.7%	0.010%
2/25/2026	Hahn Capital Management LLC	61,962	$1.80M	1.0%	-5.8%	0.025%
2/19/2026	Invesco Ltd.	21,834,003	$633.19M	0.1%	-1.3%	8.951%
2/19/2026	Corient Private Wealth LLC	36,872	$1.07M	0.0%	-5.6%	0.015%
2/18/2026	Mercer Global Advisors Inc. ADV	15,502	$453K	0.0%	N/A	0.006%
2/18/2026	Vident Advisory LLC	382,540	$11.09M	0.1%	-15.9%	0.157%
2/18/2026	State of Tennessee Department of Treasury	46,262	$1.34M	0.0%	-28.7%	0.019%
2/18/2026	Mackenzie Financial Corp	15,479	$453K	0.0%	N/A	0.006%
2/18/2026	XTX Topco Ltd	44,821	$1.30M	0.0%	-9.0%	0.018%
2/18/2026	Utah Retirement Systems	8,339	$242K	0.0%	N/A	0.003%
2/18/2026	Wellington Management Group LLP	18,948	$549K	0.0%	-3.8%	0.008%
2/18/2026	Symmetry Investments LP	10,000	$290K	0.0%	N/A	0.004%
2/18/2026	Twinbeech Capital LP	137,453	$3.99M	0.3%	-38.3%	0.056%
2/18/2026	Susquehanna Fundamental Investments LLC	219,931	$6.38M	0.2%	+304.8%	0.090%
2/18/2026	Oxford Asset Management LLP	18,629	$540K	0.2%	N/A	0.008%
2/18/2026	Old West Investment Management LLC	19,355	$561K	0.1%	N/A	0.008%
2/18/2026	Millennium Management LLC	61,187	$1.77M	0.0%	-90.5%	0.025%
2/18/2026	Moore Capital Management LP	475,314	$13.78M	0.2%	+16.7%	0.195%
2/18/2026	Gotham Asset Management LLC	635,430	$18.43M	0.1%	+159.5%	0.260%
2/18/2026	Aristotle Capital Boston LLC	358,867	$10.41M	0.6%	-12.3%	0.147%
2/18/2026	Balyasny Asset Management L.P.	267,999	$7.77M	0.0%	+644.2%	0.110%
2/18/2026	Boothbay Fund Management LLC	7,214	$209K	0.0%	N/A	0.003%
2/18/2026	American Trust Investment Advisors LLC	29,175	$846K	0.5%	-4.3%	0.012%
2/18/2026	683 Capital Management LLC	835,000	$24.22M	1.1%	-34.5%	0.342%
2/17/2026	Guggenheim Capital LLC	9,439	$274K	0.0%	N/A	0.004%
2/17/2026	AQR Capital Management LLC	1,452,049	$42.11M	0.0%	+778.9%	0.595%
2/17/2026	Cetera Investment Advisers	21,274	$617K	0.0%	-8.3%	0.009%
2/17/2026	FIL Ltd	1,429,384	$41.45M	0.0%	-8.3%	0.586%
2/17/2026	Price T Rowe Associates Inc. MD	129,482	$3.76M	0.0%	+9.6%	0.053%
2/17/2026	Soviero Asset Management LP	178,000	$5.16M	2.5%	+14.8%	0.073%
2/17/2026	Osaic Holdings Inc.	29,126	$845K	0.0%	+9.5%	0.012%
2/17/2026	Public Employees Retirement System of Ohio	49,232	$1.43M	0.0%	-4.1%	0.020%
2/17/2026	California State Teachers Retirement System	149,912	$4.35M	0.0%	-7.6%	0.061%
2/17/2026	Russell Investments Group Ltd.	437,016	$12.67M	0.0%	+50.9%	0.179%
2/17/2026	Maryland State Retirement & Pension System	29,913	$867K	0.0%	+1.6%	0.012%
2/17/2026	Atom Investors LP	43,737	$1.27M	0.1%	-69.7%	0.018%
2/17/2026	State of Wisconsin Investment Board	103,682	$3.01M	0.0%	+13.4%	0.043%
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2/17/2026	Captrust Financial Advisors	31,935	$926K	0.0%	+7.6%	0.013%
2/17/2026	ExodusPoint Capital Management LP	1,184,186	$34.34M	0.3%	+1,015.2%	0.485%
2/17/2026	Royal Bank of Canada	266,543	$7.73M	0.0%	+10.1%	0.109%
2/17/2026	Blair William & Co. IL	79,965	$2.32M	0.0%	+57.9%	0.033%
2/17/2026	Magnetar Financial LLC	20,875	$605K	0.0%	N/A	0.009%
2/16/2026	Vanguard Personalized Indexing Management LLC	17,751	$515K	0.0%	+12.7%	0.007%
2/16/2026	Verition Fund Management LLC	865,172	$25.09M	0.1%	-23.8%	0.355%
2/16/2026	Mariner LLC	48,837	$1.42M	0.0%	+20.2%	0.020%
2/16/2026	Focus Partners Wealth	2,794,417	$81.04M	0.1%	+8,467.6%	1.146%
2/16/2026	Landscape Capital Management L.L.C.	32,981	$956K	0.1%	N/A	0.014%

AMTM Institutional Ownership - Frequently Asked Questions

During the previous two years, 483 institutional investors and hedge funds held shares of Amentum. The most heavily invested institutionals were American Securities LLC ($1.06B), Invesco Ltd. ($633.19M), Vanguard Group Inc. ($446.94M), Primecap Management Co. CA ($351.68M), Legacy Advisors LLC ($284.61M), State Street Corp ($146.79M), and Frontier Capital Management Co. LLC ($128.93M).Learn more on Amentum's institutional investors.

39.93% of Amentum's stock is owned by institutional investors. Learn more on AMTM's institutional investor holdings.

Of the 446 institutional investors that purchased Amentum's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: American Securities LLC ($45.03M), Kovitz Investment Group Partners LLC ($14.79M), Invesco Ltd. ($14.32M), Primecap Management Co. CA ($12.24M), Legacy Advisors LLC ($9.81M), State Street Corp ($7.83M), and Norges Bank ($5.89M).

Institutional investors have bought a total of 53,600,377 shares in the last 24 months. This purchase volume represents approximately $1.40B in transactions.

Of the 136 institutional investors that sold Amentum's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Millennium Management LLC ($4.61M), Van ECK Associates Corp ($2.54M), State Street Corp ($1.77M), Voss Capital LP ($1.60M), Vanguard Group Inc. ($1.12M), Thompson Siegel & Walmsley LLC ($808.49K), and Ruane Cunniff & Goldfarb L.P. ($800.77K).

Institutional investors have sold a total of 21,198,240 shares in the last 24 months. This volume of shares sold represents approximately $539.28M in transactions.

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This page (NYSE:AMTM) was last updated on 6/5/2026 by MarketBeat.com Staff.

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Amentum (AMTM) Institutional Ownership

AMTM Institutional Buying and Selling by Quarter

Amentum Major Shareholders & Ownership History

AMTM Institutional Ownership - Frequently Asked Questions

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Amentum (AMTM) Institutional Ownership

Institutional Ownership Changes (13F Filings) for Amentum (NYSE:AMTM)

AMTM Institutional Buying and Selling by Quarter

Amentum Major Shareholders & Ownership History

AMTM Institutional Ownership - Frequently Asked Questions

Who are the largest shareholders of AMTM shares?

What percentage of Amentum's stock is owned by institutional investors?

Which institutional investors have been buying Amentum's stock?

How much institutional buying is happening at Amentum?

Which of Amentum's major shareholders have been selling company stock?

How much institutional selling is happening at Amentum?

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