Amentum (AMTM) Institutional Ownership

$19.49 -0.07 (-0.36%)

Closing price 09/11/2026 03:58 PM Eastern

Extended Trading

$19.40 -0.09 (-0.46%)

As of 09/11/2026 07:51 PM Eastern

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Current Institutional Ownership Percentage: 39.93%
Number of Institutional Buyers (last 12 months): 220
Total Institutional Inflows (last 12 months): $1.97B

Number of Institutional Sellers (last 12 months): 130
Total Institutional Outflows (last 12 months): $501.77M

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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
9/9/2026	WINTON GROUP Ltd	58,393	$1.21M	0.0%	+5.2%	0.024%
9/9/2026	Integrated Wealth Concepts LLC	2,405	$50K	0.0%	N/A	0.001%
9/8/2026	Mraz Amerine & Associates Inc.	90,200	$1.86M	0.3%	+25.3%	0.037%
9/8/2026	Nykredit A S	1,800	$37K	0.0%	N/A	0.001%
8/27/2026	Corient Private Wealth LP	27,543	$569K	0.0%	-6.7%	0.011%
8/26/2026	HighTower Advisors LLC	14,108	$292K	0.0%	-24.2%	0.006%
8/25/2026	VIRGINIA RETIREMENT SYSTEMS ET Al	19,400	$401K	0.0%	N/A	0.008%
8/24/2026	California State Teachers Retirement System	3,787,219	$78.28M	0.0%	+1,952.1%	1.549%
8/23/2026	Washington Trust Advisors Inc.	3,598	$74K	0.0%	-55.7%	0.001%
8/23/2026	Ameritas Advisory Services LLC	26,747	$553K	0.0%	N/A	0.011%
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8/23/2026	Troluce Capital Advisors LLC	3,565,399	$73.70M	7.6%	+256.5%	1.458%
8/22/2026	TD Waterhouse Canada Inc.	3,342	$67K	0.0%	-24.9%	0.001%
8/21/2026	AXQ Capital LP	35,915	$742K	0.1%	N/A	0.015%
8/21/2026	Nykredit A S	1,800	$37K	0.0%	N/A	0.001%
8/20/2026	Clifford Swan Investment Counsel LLC	17,495	$362K	0.0%	-8.9%	0.007%
8/20/2026	Kerrisdale Advisers LLC	59,845	$1.24M	0.3%	+105.0%	0.024%
8/20/2026	Ancora Advisors LLC	715,652	$14.79M	0.3%	+1.8%	0.293%
8/20/2026	Susquehanna Fundamental Investments LLC	394,370	$8.15M	0.2%	+81.1%	0.161%
8/20/2026	Moore Capital Management LP	365,096	$7.55M	0.1%	-58.2%	0.149%
8/19/2026	UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	249,725	$5.16M	0.0%	+0.7%	0.102%
8/19/2026	Toth Financial Advisory Corp	18,226	$377K	0.0%	-18.5%	0.007%
8/19/2026	Van ECK Associates Corp	1,988,898	$41.11M	0.0%	+263.2%	0.813%
8/19/2026	Hsbc Holdings PLC	22,218	$460K	0.0%	N/A	0.009%
8/18/2026	AWH Capital L.P.	235,250	$4.86M	0.0%	N/A	0.096%
8/18/2026	Public Employees Retirement System of Ohio	45,464	$940K	0.0%	N/A	0.019%
8/17/2026	Corient Private Wealth LP	31,354	$648K	0.0%	N/A	0.013%
8/17/2026	Permian Investment Partners LP	1,433,028	$29.62M	0.0%	N/A	0.586%
8/17/2026	Bank of America Corp DE	2,042,897	$42.23M	0.0%	N/A	0.836%
8/15/2026	Strategic Global Advisors LLC	99,103	$2.05M	0.3%	N/A	0.041%
8/15/2026	Jupiter Topco LLC	69,400	$1.43M	0.0%	N/A	0.028%
8/14/2026	Hsbc Holdings PLC	22,218	$460K	0.0%	N/A	0.009%
8/14/2026	Ancora Advisors LLC	715,652	$14.79M	0.3%	N/A	0.293%
8/14/2026	Primecap Management Co. CA	12,285,504	$253.94M	0.2%	N/A	5.025%
8/14/2026	Legal & General Group Plc	349,048	$7.22M	0.0%	N/A	0.143%
8/14/2026	The Manufacturers Life Insurance Company	273,618	$1.12M	0.0%	N/A	0.112%
8/14/2026	Peak Asset Management LLC	24,000	$496K	0.1%	N/A	0.010%
8/14/2026	Aberdeen Wealth Management LLC	8,291	$171K	0.1%	N/A	0.003%
8/14/2026	Algert Global LLC	102,220	$2.11M	0.0%	+1.2%	0.042%
8/13/2026	Sanctuary Advisors LLC	15,732	$325K	0.0%	N/A	0.006%
8/13/2026	Clear Harbor Asset Management LLC	31,780	$657K	0.0%	N/A	0.013%
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8/12/2026	De Lisle Partners LLP	374,818	$7.74M	0.8%	N/A	0.153%
8/11/2026	Allworth Financial LP	9,805	$203K	0.0%	N/A	0.004%
8/10/2026	BOK Financial Private Wealth Inc.	5,268	$109K	0.0%	N/A	0.002%
8/10/2026	Danske Bank A S	8,536	$176K	0.0%	N/A	0.003%
8/8/2026	First National Bank of Omaha	475,992	$9.72M	0.3%	N/A	0.195%
8/7/2026	BlackRock Inc.	17,906,984	$370.14M	0.0%	N/A	7.329%
8/7/2026	Deutsche Bank AG	21,821	$451K	0.0%	N/A	0.009%
8/7/2026	Old West Investment Management LLC	32,875	$680K	0.1%	N/A	0.013%
8/6/2026	Global Retirement Partners LLC	1,484	$31K	0.0%	N/A	0.001%
8/6/2026	Bank of New York Mellon Corp	878,084	$18.15M	0.0%	N/A	0.359%
8/6/2026	State of Wyoming	17,667	$365K	0.0%	N/A	0.007%
8/3/2026	Oppenheimer Asset Management Inc.	24,597	$508K	0.0%	N/A	0.010%
8/3/2026	Bryn Mawr Trust Advisors LLC	141,443	$2.92M	0.1%	N/A	0.058%
7/10/2026	Wedge Capital Management L L P NC	187,832	$3.88M	0.1%	+14.1%	0.077%
7/10/2026	Hudson Value Partners LLC	250,185	$5.17M	1.3%	+22.7%	0.102%
7/9/2026	Steadtrust LLC	30,400	$628K	0.3%	-33.0%	0.012%
7/7/2026	GAMMA Investing LLC	4,958	$102K	0.0%	-12.4%	0.002%
6/16/2026	Empowered Funds LLC	7,900	$206K	0.0%	N/A	0.003%
6/8/2026	Pine Valley Investments Ltd Liability Co	79,275	$2.07M	0.1%	+4.5%	0.032%
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%
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%
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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%
4/27/2026	New York State Teachers Retirement System	165,329	$4.31M	0.0%	-0.4%	0.068%

AMTM Institutional Ownership - Frequently Asked Questions

During the previous two years, 497 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), BlackRock Inc. ($370.14M), Legacy Advisors LLC ($284.61M), Primecap Management Co. CA ($253.94M), and State Street Corp ($146.79M).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 462 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), Primecap Management Co. CA ($24.52M), BlackRock Inc. ($17.91M), Kovitz Investment Group Partners LLC ($14.79M), Invesco Ltd. ($14.32M), Legacy Advisors LLC ($9.81M), and State Street Corp ($7.83M).

Institutional investors have bought a total of 82,998,332 shares in the last 24 months. This purchase volume represents approximately $1.97B in transactions.

Of the 130 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), Vanguard Group Inc. ($1.12M), Thompson Siegel & Walmsley LLC ($808.49K), Ruane Cunniff & Goldfarb L.P. ($800.77K), and Voss Capital LP ($775K).

Institutional investors have sold a total of 19,672,836 shares in the last 24 months. This volume of shares sold represents approximately $501.77M in transactions.

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Institutional ownership data for NYSE:AMTM is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 9/9/2026. New 13F filings are added each quarter as they're published.

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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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