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Quantum (QMCO) Institutional Ownership

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$30.42 +1.24 (+4.25%)
Closing price 10/9/2026 04:00 PM Eastern
Extended Trading
$30.30 -0.13 (-0.41%)
As of 10/9/2026 07:51 PM 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)
$70.87M
Number of
Institutional Sellers
(last 12 months)
1
Total
Institutional Outflows
(last 12 months)
$547.39K
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Skip Chart & View Institutional Buying and Selling Data

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
9/22/2026State Street Corp75,914$835K0.0%+4.3%0.193%
9/9/2026Squarepoint Ops LLC33,817$372K0.0%N/A0.086%
9/3/2026Cygnus Capital Advisors LLC74,323$818K0.6%-40.1%0.189%
8/20/2026Susquehanna Fundamental Investments LLC34,601$381K0.0%N/A0.088%
8/20/2026Alyeska Investment Group L.P.2,653,928$29.19M0.1%N/A6.734%
8/17/2026Bank of America Corp DE170,130$1.87M0.0%+730.5%0.432%
8/15/2026Man Group plc68,593$755K0.0%N/A0.174%
8/14/2026Manatuck Hill Partners LLC350,000$3.85M1.3%N/A0.888%
8/13/2026Two Seas Capital LP2,488,535$27.37M0.5%N/A6.316%
8/7/2026BlackRock Inc.273,030$3.00M0.0%N/A0.693%
5/15/2026Sona Asset Management US LLC70,092$333K0.0%N/A0.479%
4/29/2026R Squared Ltd12,245$58K0.0%N/A0.084%
2/18/2026XTX Topco Ltd11,948$77K0.0%N/A0.087%
2/18/2026Millennium Management LLC11,244$73K0.0%N/A0.082%
2/18/2026Engineers Gate Manager LP16,407$106K0.0%N/A0.120%
2/17/2026Price T Rowe Associates Inc. MD15,901$103K0.0%N/A0.116%
2/16/2026Barclays PLC14,197$92K0.0%+3,020.2%0.103%
2/13/2026Marshall Wace LLP21,740$140K0.0%N/A0.158%
2/13/2026State Street Corp90,714$585K0.0%+231.7%0.661%
2/11/2026LPL Financial LLC18,364$118K0.0%N/A0.134%
2/9/2026Geode Capital Management LLC156,871$1.01M0.0%+97.5%1.143%
1/29/2026NBC Securities Inc.4,000$26K0.0%N/A0.029%
1/21/2026Flagship Harbor Advisors LLC26,585$171K0.0%+17.1%0.194%
11/17/2025Bank of America Corp DE2,896$29K0.0%+337.5%0.022%
11/13/2025UBS Group AG162,605$1.61M0.0%+170.0%1.214%
11/13/2025BNP Paribas Financial Markets3,461$34K0.0%+322.1%0.026%
11/12/2025Riverview Capital Advisers LLC10,000$99K0.0%N/A0.075%
11/7/2025Vanguard Group Inc.303,597$3.01M0.0%+18.3%2.266%
11/5/2025Flagship Harbor Advisors LLC22,710$225K0.0%N/A0.171%
11/3/2025AlphaQuest LLC35,536$353K0.0%+655.0%0.267%
11/3/2025Hollencrest Capital Management6,560$65K0.0%+228.0%0.049%
8/14/2025Raymond James Financial Inc.4,615$46K0.0%N/A0.066%
8/13/2025Sassicaia Capital Advisers LLC23,267$232K0.1%N/A0.335%
8/13/2025Marshall Wace LLP178,021$1.78M0.0%N/A2.561%
8/8/2025Geode Capital Management LLC69,384$692K0.0%+9.1%0.998%
8/8/2025SBI Securities Co. Ltd.5,636$56K0.0%+99.4%0.081%
7/31/2025AlphaQuest LLC4,707$47K0.0%-51.2%0.068%
7/25/2025Apollon 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%
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5/12/2025Virtu Financial LLC19,721$284K0.0%N/A0.284%
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%
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2/14/2023Marathon Capital Management60,000$65K0.0%-81.4%0.057%
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%


QMCO Institutional Ownership - Frequently Asked Questions

During the previous two years, 45 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 6,617,895 shares in the last 24 months. This purchase volume represents approximately $70.87M 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.


Related Companies

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 9/22/2026. New 13F filings are added each quarter as they're published.
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