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Quantum (QMCO) Institutional Ownership

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$25.09 0.00 (0.00%)
Closing price 09/18/2026 04:00 PM Eastern
Extended Trading
$25.71 +0.62 (+2.46%)
As of 08:26 AM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Institutional Ownership Changes (13F Filings) for Quantum (NASDAQ:QMCO)

Current
Institutional Ownership
Percentage
63.66%
Number of
Institutional Buyers
(last 12 months)
27
Total
Institutional Inflows
(last 12 months)
$70.83M
Number of
Institutional Sellers
(last 12 months)
1
Total
Institutional Outflows
(last 12 months)
$547.39K
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QMCO Institutional Buying and Selling by Quarter

Quantum Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
9/9/2026 Squarepoint Ops LLC33,817$372K0.0%N/A0.086%
9/3/2026 Cygnus Capital Advisors LLC74,323$818K0.6%-40.1%0.189%
8/20/2026 Susquehanna Fundamental Investments LLC34,601$381K0.0%N/A0.088%
8/20/2026 Alyeska Investment Group L.P.2,653,928$29.19M0.1%N/A6.734%
8/17/2026 Bank of America Corp DE170,130$1.87M0.0%+730.5%0.432%
8/15/2026 Man Group plc68,593$755K0.0%N/A0.174%
8/14/2026 Manatuck Hill Partners LLC350,000$3.85M1.3%N/A0.888%
8/13/2026 Two Seas Capital LP2,488,535$27.37M0.5%N/A6.316%
8/7/2026 BlackRock Inc.273,030$3.00M0.0%N/A0.693%
5/15/2026 Sona Asset Management US LLC70,092$333K0.0%N/A0.479%
4/29/2026 R Squared Ltd12,245$58K0.0%N/A0.084%
2/18/2026 XTX Topco Ltd11,948$77K0.0%N/A0.087%
2/18/2026 Millennium Management LLC11,244$73K0.0%N/A0.082%
2/18/2026 Engineers Gate Manager LP16,407$106K0.0%N/A0.120%
2/17/2026 Price T Rowe Associates Inc. MD15,901$103K0.0%N/A0.116%
2/16/2026 Barclays PLC14,197$92K0.0%+3,020.2%0.103%
2/13/2026 Marshall Wace LLP21,740$140K0.0%N/A0.158%
2/13/2026 State Street Corp90,714$585K0.0%+231.7%0.661%
2/11/2026 LPL Financial LLC18,364$118K0.0%N/A0.134%
2/9/2026 Geode Capital Management LLC156,871$1.01M0.0%+97.5%1.143%
1/29/2026 NBC Securities Inc.4,000$26K0.0%N/A0.029%
1/21/2026 Flagship Harbor Advisors LLC26,585$171K0.0%+17.1%0.194%
11/17/2025 Bank of America Corp DE2,896$29K0.0%+337.5%0.022%
11/13/2025 UBS Group AG162,605$1.61M0.0%+170.0%1.214%
11/13/2025 BNP Paribas Financial Markets3,461$34K0.0%+322.1%0.026%
11/12/2025 Riverview Capital Advisers LLC10,000$99K0.0%N/A0.075%
11/7/2025Vanguard Group Inc.303,597$3.01M0.0%+18.3%2.266%
11/5/2025 Flagship Harbor Advisors LLC22,710$225K0.0%N/A0.171%
11/3/2025 AlphaQuest LLC35,536$353K0.0%+655.0%0.267%
11/3/2025 Hollencrest Capital Management6,560$65K0.0%+228.0%0.049%
8/14/2025 Raymond James Financial Inc.4,615$46K0.0%N/A0.066%
8/13/2025 Sassicaia Capital Advisers LLC23,267$232K0.1%N/A0.335%
8/13/2025 Marshall Wace LLP178,021$1.78M0.0%N/A2.561%
8/8/2025 Geode Capital Management LLC69,384$692K0.0%+9.1%0.998%
8/8/2025 SBI Securities Co. Ltd.5,636$56K0.0%+99.4%0.081%
7/31/2025 AlphaQuest LLC4,707$47K0.0%-51.2%0.068%
7/25/2025 Apollon Wealth Management LLC10,714$107K0.0%N/A0.154%
5/15/2025Activest Wealth Management4,283$62K0.0%+428,200.0%0.062%
5/14/2025AlphaQuest LLC9,653$139K0.0%N/A0.139%
5/12/2025Virtu Financial LLC19,721$284K0.0%N/A0.284%
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5/5/2025Allianz Asset Management GmbH962,127$13.84M0.0%+87.8%13.844%
2/17/2025Squarepoint Ops LLC9,375$506K0.0%N/A0.163%
2/17/2025Bridgeway Capital Management LLC8,240$444K0.0%N/A0.143%
2/17/2025Bank of America Corp DE75,305$4.06M0.0%+125,408.3%1.307%
2/14/2025Itau Unibanco Holding S.A.56,000$3.02M0.1%N/A0.972%
2/14/2025Jane Street Group LLC33,612$1.81M0.0%N/A0.584%
2/14/2025Schonfeld Strategic Advisors LLC6,400$345K0.0%N/A0.111%
2/14/2025Northern Trust Corp10,407$561K0.0%-7.0%0.181%
2/14/2025Price T Rowe Associates Inc. MD5,030$272K0.0%N/A0.087%
2/13/2025Marshall Wace LLP6,188$334K0.0%N/A0.107%
2/12/2025Diametric Capital LP12,423$670K0.5%N/A0.213%
2/12/2025CIBC Private Wealth Group LLC11,000$593K0.0%N/A0.191%
2/11/2025LPL Financial LLC7,354$397K0.0%N/A0.128%
2/6/2025SBI Securities Co. Ltd.3,598$194K0.0%N/A0.062%
1/29/2025UNICOM Systems Inc.75,237$4.06M1.0%N/A1.551%
1/21/2025Flagship Harbor Advisors LLC4,194$226K0.0%N/A0.086%
1/15/2025Arkadios Wealth Advisors8,642$466K0.0%N/A0.178%
11/19/2024TCW Group Inc.106,010$371K0.0%-95.0%2.186%
11/15/2024State Street Corp17,114$60K0.0%-95.0%0.357%
10/8/2024Advance Capital Management Inc.17,310$61K0.0%-82.4%0.018%
8/16/2024Pacific Ridge Capital Partners LLC1,264,992$518K0.1%-3.9%1.320%
5/17/2024Tidal Investments LLC44,165$26K0.0%N/A0.046%
5/15/2024Price T Rowe Associates Inc. MD100,600$60K0.0%-42.6%0.106%
5/14/2024B. Riley Financial Inc.695,958$418K0.4%-65.1%0.732%
5/10/2024Acadian Asset Management LLC58,580$34K0.0%-71.4%0.062%
5/9/2024Pacific Ridge Capital Partners LLC1,316,467$783K0.2%-1.7%1.385%
4/19/2024Kovack Advisors Inc.263,901$157K0.0%+33.5%0.278%
2/14/2024Neuberger Berman Group LLC14,819,147$5.17M0.0%-3.3%15.593%
2/12/2024Pacific Ridge Capital Partners LLC1,338,647$467K0.1%-4.5%1.409%
2/9/2024Neuberger Berman Group LLC14,819,147$5.17M0.0%-3.3%15.593%
2/9/2024King Luther Capital Management Corp980,000$342K0.0%-29.2%1.031%
11/13/2023Connor Clark & Lunn Investment Management Ltd.64,066$39K0.0%+151.5%0.067%
11/13/2023B. Riley Financial Inc.1,995,303$1.22M0.4%-18.1%2.099%
11/13/2023Pacific Ridge Capital Partners LLC1,402,456$855K0.2%-2.5%1.476%
8/8/2023B. Riley Financial Inc.2,436,303$2.63M0.7%-19.6%2.580%
8/7/2023Acadian Asset Management LLC401,362$433K0.0%+8.8%0.425%
7/21/2023Kovack Advisors Inc.515,477$557K0.1%+2.2%0.550%
5/17/2023Long Focus Capital Management LLC5,250,364$6.04M0.3%+2.8%4.990%
5/16/2023Solas Capital Management LLC3,728,108$4.29M2.3%-26.7%3.543%
5/15/2023Roumell Asset Management LLC1,687,553$1.94M4.4%-5.2%1.604%
5/12/2023Long Focus Capital Management LLC3,364,033$3.87M0.4%-34.1%3.197%
5/11/2023King Luther Capital Management Corp1,384,915$1.59M0.0%+1.5%1.316%
5/11/2023Acadian Asset Management LLC368,850$422K0.0%+35.1%0.351%
5/9/2023B. Riley Financial Inc.3,030,746$3.49M0.9%-20.8%2.881%
5/4/2023Herald Investment Management Ltd1,000,000$1.13M0.3%+33.9%0.950%
4/21/2023Kovack Advisors Inc.504,477$580K0.1%+43.3%0.479%
3/1/2023B. Riley Financial Inc.3,824,811$4.17M0.9%-4.5%3.635%
2/22/2023Kovack Advisors Inc.352,001$384K0.1%+49.2%0.335%
2/14/2023AWM Investment Company Inc.657,280$716K0.1%-20.9%0.625%
2/14/2023Marathon Capital Management60,000$65K0.0%-81.4%0.057%
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2/14/2023Pacific Ridge Capital Partners LLC1,370,413$1.49M0.4%-1.9%1.303%
2/13/2023Neuberger Berman Group LLC15,287,580$16.66M0.0%-3.0%14.531%
2/10/2023Senvest Management LLC2,550,931$2.78M0.1%-54.8%2.425%
2/8/2023Russell Investments Group Ltd.25,476$28K0.0%-83.2%0.024%
2/7/2023B. Riley Financial Inc.3,824,811$4.17M0.9%-4.5%3.635%
11/15/2022Union Square Park Capital Management LLC115,275$124K0.1%-71.2%0.111%
11/15/2022Long Focus Capital Management LLC4,912,602$5.31M0.5%+19.6%4.731%
11/15/2022Marathon Capital Management323,422$349K0.1%-3.2%0.311%
11/14/2022Ergoteles LLC177,559$192K0.0%-33.9%0.171%
11/14/2022Kovack Advisors Inc.235,923$255K0.0%+8.0%0.227%


QMCO Institutional Ownership - Frequently Asked Questions

During the previous two years, 46 institutional investors and hedge funds held shares of Quantum. The most heavily invested institutionals were Alyeska Investment Group L.P. ($29.19M), Two Seas Capital LP ($27.37M), Allianz Asset Management GmbH ($13.84M), UNICOM Systems Inc. ($4.06M), Manatuck Hill Partners LLC ($3.85M), Itau Unibanco Holding S.A. ($3.02M), and Vanguard Group Inc. ($3.01M).Learn more on Quantum's institutional investors.

63.66% of Quantum's stock is owned by institutional investors. Learn more on QMCO's institutional investor holdings.

Of the 42 institutional investors that purchased Quantum's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Alyeska Investment Group L.P. ($2.65M), Two Seas Capital LP ($2.49M), Allianz Asset Management GmbH ($449.71K), Manatuck Hill Partners LLC ($350K), BlackRock Inc. ($273.03K), Bank of America Corp DE ($227.12K), and Marshall Wace LLP ($205.95K).

Institutional investors have bought a total of 6,614,795 shares in the last 24 months. This purchase volume represents approximately $70.83M in transactions.

The following institutional investors have sold Quantum stock in the last 24 months: Cygnus Capital Advisors LLC ($49.76K).

Institutional investors have sold a total of 49,763 shares in the last 24 months. This volume of shares sold represents approximately $547.39K in transactions.


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Institutional ownership data for NASDAQ:QMCO 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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