QUANTUM CORP (QMCO) Institutional Ownership Changes & 13F Activity

QUANTUM CORP (QMCO). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Alyeska Investment Group, L.P., Oaktree Capital Management, Neuberger Berman Group Llc, Ashford Capital Management Inc, and Portolan Capital Management, Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Cygnus Capital Advisors, LlcSell-49,763-40.1%74,323$818.00KQ2 2026Sep 03, 2026
Ashford Capital Management IncBuy+1,039,2001,039,200$10.55MQ2 2026Aug 21, 2026
Alyeska Investment Group, L.P.Buy+2,653,9282,653,928$29.19MQ2 2026Aug 14, 2026
Oaktree Capital ManagementBuy+2,011,6782,011,678$22.13MQ2 2026Aug 14, 2026
Portolan Capital Management, LlcBuy+1,020,1201,020,120$11.22MQ2 2026Aug 14, 2026
Manatuck Hill Partners, LlcBuy+350,000350,000$3.85MQ2 2026Aug 14, 2026
Cinctive Capital Management LpBuy+182,769182,769$2.01MQ2 2026Aug 14, 2026
Bank Of America CorpBuy+149,645+730.5%170,130$1.87MQ2 2026Aug 14, 2026
Raymond James Financial IncBuy+103,836103,836$1.14MQ2 2026Aug 14, 2026
Kkm Financial LlcBuy+90,27490,274$960.51KQ2 2026Aug 14, 2026
Qube Research & Technologies LtdBuy+80,97780,977$890.75KQ2 2026Aug 14, 2026
Sona Asset Management (Us) LlcBuy+79,908+114.0%150,000$1.65MQ2 2026Aug 14, 2026
Susquehanna International Group, LlpBuy+69,77569,775$767.52KQ2 2026Aug 14, 2026
Man Group PlcBuy+68,59368,593$754.52KQ2 2026Aug 14, 2026
Sei Investments CoBuy+38,73938,739$426.15KQ2 2026Aug 14, 2026
Susquehanna Fundamental Investments, LlcBuy+34,60134,601$380.61KQ2 2026Aug 14, 2026
Squarepoint Ops LlcBuy+33,81733,817$371.99KQ2 2026Aug 14, 2026
Millennium Management LlcBuy+21,75521,755$239.31KQ2 2026Aug 14, 2026
Goldman Sachs Group IncBuy+19,15319,153$210.68KQ2 2026Aug 14, 2026
Schonfeld Strategic Advisors LlcBuy+12,05512,055$132.60KQ2 2026Aug 14, 2026
Barclays PlcSell-11,988-96.3%455$5.00KQ2 2026Aug 14, 2026
Invesco Ltd.Buy+10,83910,839$119.23KQ2 2026Aug 14, 2026
Wells Fargo & Company/MnBuy+7,175+173.9%11,300$124.30KQ2 2026Aug 14, 2026
Price T Rowe Associates IncBuy+3,268+15.0%25,069$276.00KQ2 2026Aug 14, 2026
Royal Bank Of CanadaBuy+637+497.7%765$8.00KQ2 2026Aug 14, 2026
Osaic Holdings, Inc.Sell-480-49.7%485$5.34KQ2 2026Aug 14, 2026
Jones Financial Companies LllpBuy+113+7.7%1,580$18.41KQ2 2026Aug 14, 2026
Quarry LpBuy+1717$187.00Q2 2026Aug 14, 2026
Neuberger Berman Group LlcBuy+1,163,3151,163,315$12.80MQ2 2026Aug 13, 2026
Marshall Wace, LlpBuy+675,547+1800.1%713,075$7.84MQ2 2026Aug 13, 2026
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Frequently asked questions about QMCO activity

  • Which institutional owners are buying QMCO?

    Institutional owners buying QMCO include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in QMCO activity?

    "Buy" means an investor increased their reported position in QMCO compared to the prior reporting period. This reflects growing exposure to QUANTUM CORP (QMCO) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in QMCO increasing?

    Institutional interest in QMCO can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.