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Disclosery

QMCO QUANTUM CORP

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COM (common), issuer CIK 709283

35 managers (37 13F filers) reported a position in QMCO shares at 2026-03-31, 1,610,725 shares in all. 7 filers opened a position and 11 filers sold out during the quarter.

Managers
35
13F filers
37
New
7
Added
9
Reduced
11
Sold out
11
Shares held by filers
1,610,725

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, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, 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
VANGUARD GROUP INCgroup of 3 filers holding625,538$2.97MnewTimeline
BlackRock, Inc.in group BlackRock, Inc.217,532$1.03M<0.01%-3,21413F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC159,179$756K<0.01%+2,30813F-HRTimelineGroup
Cygnus Capital Advisors, LLC124,086$590K0.4%+54,66313F-HRTimeline
UBS Group AGin group UBS Group AG99,068$471K<0.01%-66,77013F-HRTimelineGroup
STATE STREET CORPin group STATE STREET CORP72,814$346K<0.01%-17,90013F-HRTimelineGroup
SONA ASSET MANAGEMENT (US) LLCin group SONA ASSET MANAGEMENT (US) LLC70,092$333K0.01%new13F-HRTimelineGroup
MARSHALL WACE, LLPin group MARSHALL WACE, LLP37,528$178K<0.01%+15,78813F-HRTimelineGroup
NORTHERN TRUST CORPin group NORTHERN TRUST CORP28,762$137K<0.01%013F-HRTimelineGroup
LPL Financial LLC24,598$117K<0.01%+6,23413F-HRTimeline
PRICE T ROWE ASSOCIATES INC /MD/21,801$104K<0.01%+5,90013F-HRTimeline
BANK OF AMERICA CORP /DE/in group BANK OF AMERICA CORP /DE/20,485$97.3K<0.01%-5013F-HRTimelineGroup
FLAGSHIP HARBOR ADVISORS, LLC17,185$81.6K<0.01%-9,40013F-HRTimeline
BRIDGEWAY CAPITAL MANAGEMENT, LLC16,240$77.1K<0.01%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY15,179$72.1K<0.01%+10,86613F-HRTimelineGroup
Kovack Advisors, Inc.12,480$62.8K<0.01%new13F-HRTimeline
BARCLAYS PLCin group BARCLAYS PLC12,443$59.1K<0.01%-1,75413F-HRTimelineGroup
R Squared Ltd12,245$58.2K0.03%new13F-HRTimeline
XTX Topco Ltdin group XTX Topco Ltd11,321$53.8K<0.01%-62713F-HRTimelineGroup
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN4,125$19.6K<0.01%+60013F-HR/ATimelineGroup
SBI Securities Co., Ltd.2,004$9.52K<0.01%-42113F-HRTimeline
HOLLENCREST CAPITAL MANAGEMENT2,000$9.5K<0.01%new13F-HRTimeline
JONES FINANCIAL COMPANIES LLLPin group JONES FINANCIAL COMPANIES LLLP1,467$6.87K<0.01%-37413F-HRTimelineGroup
OSAIC HOLDINGS, INC.in group OSAIC HOLDINGS, INC.965$4.58K<0.01%+21713F-HRTimelineGroup
FEDERATED HERMES, INC.in group FEDERATED HERMES, INC.835$3.97K<0.01%+33413F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS261$1.24K<0.01%-75813F-HRTimelineGroup
ROYAL BANK OF CANADAin group ROYAL BANK OF CANADA128$1K<0.01%-70513F-HRTimelineGroup
EFG International AGin group EFG International AG100$477<0.01%013F-HRTimelineGroup
NATIONAL BANK OF CANADA /FI/in group NATIONAL BANK OF CANADA /FI/100$475<0.01%013F-HRTimelineGroup
Rialto Wealth Management, LLC87$414<0.01%new13F-HRTimeline
Lavaca Capital LLC39$185<0.01%new13F-HRTimeline
Federation des caisses Desjardins du Qu…25$119<0.01%013F-HRTimeline
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO8$34<0.01%013F-HR/ATimelineGroup
Farther Finance Advisors, LLC4$20<0.01%013F-HRTimeline
Activest Wealth Management1$4<0.01%013F-HRTimeline