Skip to content
Disclosery

QMCO QUANTUM CORP

Follow

COM (common), issuer CIK 709283

57 managers (60 13F filers) reported a position in QMCO shares at 2026-06-30, 14,378,632 shares in all. 31 filers opened a position and 8 filers sold out during the quarter.

Managers
57
13F filers
60
New
31
Added
18
Reduced
6
Sold out
8
Shares held by filers
14,378,632

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

No Form 4 transaction on this security in the data.

13F holders, Q2 2026

Filers in the available 13F reports with a share position at 2026-06-30, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
Alyeska Investment Group, L.P.in group Alyeska Investment Group, L.P.2,653,928$29.2M0.08%new13F-HRTimelineGroup
Two Seas Capital LPin group Two Seas Capital LP2,488,535$27.4M1.04%new13F-HRTimelineGroup
OAKTREE CAPITAL MANAGEMENT LPin group Oaktree Capital Holdings, LLC2,011,678$22.1M0.42%new13F-HRTimelineGroup
NEUBERGER BERMAN GROUP LLCin group NEUBERGER BERMAN GROUP LLC1,163,315$12.8M0.01%new13F-HRTimelineGroup
Portolan Capital Management, LLCin group Portolan Capital Management, …1,020,120$11.2M0.42%new13F-HRTimelineGroup
ASHFORD CAPITAL MANAGEMENT INC1,039,200$10.6M1.13%new13F-HRTimeline
MARSHALL WACE, LLPin group MARSHALL WACE, LLP713,075$7.84M0.01%+675,54713F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding700,666$7.71M+75,128Timeline
Manatuck Hill Partners, LLC350,000$3.85M1.28%new13F-HRTimeline
BlackRock, Inc.in group BlackRock, Inc.273,030$3M<0.01%+55,49813F-HRTimelineGroup
Cinctive Capital Management LP182,769$2.01M0.08%new13F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/170,130$1.87M<0.01%+149,64513F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC164,600$1.81M<0.01%+5,42113F-HRTimelineGroup
RENAISSANCE TECHNOLOGIES LLC154,516$1.7M<0.01%new13F-HRTimeline
SONA ASSET MANAGEMENT (US) LLCin group SONA ASSET MANAGEMENT (US) LLC150,000$1.65M0.06%+79,90813F-HRTimelineGroup
Walleye Capital LLCin group Walleye Capital LLC120,044$1.32M0.01%new13F-HRTimelineGroup
SUSQUEHANNA INTERNATIONAL GROUP, LLPgroup of 2 filers holding104,376$1.15MnewTimeline
RAYMOND JAMES FINANCIAL INCin group RAYMOND JAMES FINANCIAL INC103,836$1.14M<0.01%new13F-HRTimelineGroup
Centiva Capital, LP100,000$1.1M0.04%new13F-HRTimeline
KKM Financial LLC90,274$961K0.13%new13F-HRTimeline
Qube Research & Technologies Ltd80,977$891K<0.01%new13F-HRTimeline
STATE STREET CORPin group STATE STREET CORP75,914$835K<0.01%+3,10013F-HRTimelineGroup
Man Group plcin group Man Group plc68,593$755K<0.01%new13F-HRTimelineGroup
Informed Momentum Co LLC64,857$713K0.06%new13F-HRTimeline
UBS Group AGin group UBS Group AG46,106$507K<0.01%-52,96213F-HRTimelineGroup
SEI INVESTMENTS COin group SEI INVESTMENTS CO38,739$426K<0.01%new13F-HRTimelineGroup
Squarepoint Ops LLCin group Squarepoint Ops LLC33,817$372K<0.01%new13F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP33,220$365K<0.01%+4,45813F-HRTimelineGroup
PRICE T ROWE ASSOCIATES INC /MD/25,069$276K<0.01%+3,26813F-HRTimeline
MILLENNIUM MANAGEMENT LLCin group MILLENNIUM MANAGEMENT LLC21,755$239K<0.01%new13F-HRTimelineGroup
GOLDMAN SACHS GROUP INCin group GOLDMAN SACHS GROUP INC19,153$211K<0.01%new13F-HRTimelineGroup
BRIDGEWAY CAPITAL MANAGEMENT, LLC16,240$179K<0.01%013F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY15,492$170K<0.01%+31313F-HRTimelineGroup
CITIGROUP INCin group CITIGROUP INC14,426$159K<0.01%new13F-HRTimelineGroup
Kovack Advisors, Inc.13,430$147K0.01%+95013F-HRTimeline
Schonfeld Strategic Advisors LLC12,055$133K<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN11,300$124K<0.01%+7,17513F-HRTimelineGroup
FLAGSHIP HARBOR ADVISORS, LLC11,004$121K<0.01%-6,18113F-HRTimeline
Invesco Ltd.in group Invesco Ltd.10,839$119K<0.01%new13F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO3,680$43.6K<0.01%+3,67213F-HRTimelineGroup
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP1,580$18.4K<0.01%+11313F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS1,187$13.1K<0.01%+92613F-HRTimelineGroup
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.1,158$12.7K<0.01%+32313F-HRTimelineGroup
SBI Securities Co., Ltd.1,070$11.8K<0.01%-93413F-HRTimeline
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA765$8K<0.01%+63713F-HRTimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…655$7.21K<0.01%new13F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.485$5.34K<0.01%-48013F-HRTimelineGroup
BARCLAYS PLCin group BARCLAYS PLC455$5K<0.01%-11,98813F-HRTimelineGroup
HARBOUR INVESTMENTS, INC.183$2.01K<0.01%new13F-HRTimeline
FMR LLCin group FMR LLC106$1.17K<0.01%new13F-HRTimelineGroup
EFG International AGin group EFG International AG100$1.1K<0.01%013F-HRTimelineGroup
Global Retirement Partners, LLC65$715<0.01%13F-HRTimeline
Continuum Advisory, LLC34$374<0.01%new13F-HRTimeline
Quarry LP17$187<0.01%new13F-HRTimeline
HOLLENCREST CAPITAL MANAGEMENT10$110<0.01%-1,99013F-HRTimeline
Farther Finance Advisors, LLC4$44<0.01%013F-HRTimeline
NewEdge Advisors, LLC0$00%new13F-HRTimelineValue filed as zero, left out of ratios. Amount filed as zero, left out of ratios.