13F reference period
Q2 2026
Security Snapshot
QUANTUM CORP /DE/ - Common Stock, $0.01 par value per share (QMCO) Institutional Ownership
CUSIP: 747906600
13F Institutional Holders and Ownership History from Q3 2024 to Q3 2026
Institutions Reporting
60
Shares (Excl. Options)
14.45M
Full value: 14,452,955 · shares · 30 Jun 2026Price
$11.00
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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- Security type / class
- Equity / Common Stock, $0.01 par value per share
- Symbol
- QMCO on Nasdaq
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 14,452,955
- Total 13F value
- $158,074,442
- Portfolio coverage rank
- 0%
- Share change
- +12,840,602
- Value change
- +$140,639,629
- Number of holders
- 60
- Shares outstanding
- 39,500,556
- SEC-reported price per share
- $31.72
- Insider filing price
- $31.72
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- QMCO - QUANTUM CORP /DE/ - Common Stock, $0.01 par value per share is tracked under CUSIP 747906600.
- 60 institutions reported positions in Q2 2026.
- 6 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 36 to 60 between Q1 2026 and Q2 2026.
- SEC-reported value moved from to
$7.66M
Full value: $7,655,139 · USD · 31 Mar 2026.$158.07M
Full value: $158,074,442 · USD · 30 Jun 2026
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 60 institutions filings for Q2 2026.
Security key
747906600
13F reference period
Q2 2026
13F holders
60
13D/G owners
6
CIK / CUSIP context first
Open Q2 2026 holders
QMCO full holder history
QUANTUM CORP /DE/ SEC filings
QUANTUM CORP /DE/ company facts
QUANTUM CORP /DE/ insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 747906600:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
6
Security
QMCO
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Dialectic Technology SPV LLC | 40% | -3.4% | $151,021,051 | +$64,381,473 | 16,892,735 | +74% | JOHN FICHTHORN | 04 Jun 2026 |
| Alyeska Investment Group, L.P. | 6.7% | $25,663,484 | 2,653,928 | Alyeska Investment Group, L.P. | 30 Jun 2026 | |||
| Two Seas Capital LP | 6.3% | $24,064,133 | 2,488,535 | Two Seas Capital LP | 30 Jun 2026 | |||
| OAKTREE CAPITAL MANAGEMENT LP | 5.1% | $19,452,926 | 2,011,678 | Oaktree Capital Management LP | 30 Jun 2026 | |||
| VANGUARD GROUP INC | 5% | $2,714,883 | 242,184 | The Vanguard Group | 31 Dec 2024 | |||
| Blue Torch Capital LP | 2.3% | -68% | $1,521,903 | -$3,029,110 | 135,763 | -67% | Blue Torch Capital LP | 13 Feb 2025 |
As of 30 Jun 2026,
60
institutional investors reported holding
shares of
QUANTUM CORP /DE/ - Common Stock, $0.01 par value per share (QMCO).
This represents
37%
of the company’s total
outstanding shares.
14.45M
Full value: 14,452,955 · shares · 30 Jun 202639.5M
Full value: 39,500,556 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
35%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Alyeska Investment Group, L.P. | 6.7% | 2,653,928 | 0.08% | $29,193,208 | |
| Two Seas Capital LP | 6.3% | 2,488,535 | 1% | $27,373,885 | |
| OAKTREE CAPITAL MANAGEMENT LP | 5.1% | 2,011,678 | 0.42% | $22,128,458 | |
| NEUBERGER BERMAN GROUP LLC | 2.9% | 1,163,315 | 0.01% | $12,796,465 | |
| ASHFORD CAPITAL MANAGEMENT INC | 2.6% | 1,039,200 | 1.1% | $10,551,200 | |
| Portolan Capital Management, LLC | 2.6% | 1,020,120 | 0.42% | $11,221,320 | |
| MARSHALL WACE, LLP | 1.8% | 713,075 | +1800% | 0.01% | $7,843,825 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.5% | 605,541 | +12% | 0% | $6,660,951 |
| Manatuck Hill Partners, LLC | 0.89% | 350,000 | 1.3% | $3,850,000 | |
| BlackRock, Inc. | 0.69% | 273,030 | +26% | 0% | $3,003,330 |
| Cinctive Capital Management LP | 0.46% | 182,769 | 0.08% | $2,010,459 | |
| BANK OF AMERICA CORP /DE/ | 0.43% | 170,130 | +731% | 0% | $1,871,430 |
| GEODE CAPITAL MANAGEMENT, LLC | 0.42% | 164,600 | +3.4% | 0% | $1,811,524 |
| RENAISSANCE TECHNOLOGIES LLC | 0.39% | 154,516 | 0% | $1,699,676 | |
| SONA ASSET MANAGEMENT (US) LLC | 0.38% | 150,000 | +114% | 0.06% | $1,650,000 |
| Walleye Capital LLC | 0.3% | 120,044 | 0.01% | $1,320,484 | |
| RAYMOND JAMES FINANCIAL INC | 0.26% | 103,836 | 0% | $1,142,196 | |
| Centiva Capital, LP | 0.25% | 100,000 | 0.04% | $1,100,000 | |
| KKM Financial LLC | 0.23% | 90,274 | 0.13% | $960,515 | |
| VANGUARD FIDUCIARY TRUST CO | 0.23% | 89,125 | +11% | 0% | $980,375 |
| Qube Research & Technologies Ltd | 0.21% | 80,977 | 0% | $890,747 | |
| STATE STREET CORP | 0.19% | 75,914 | +4.3% | 0% | $835,054 |
| Cygnus Capital Advisors, LLC | 0.19% | 74,323 | -40% | 0.56% | $818,000 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | 0.18% | 69,775 | 0% | $767,525 | |
| Man Group plc | 0.17% | 68,593 | 0% | $754,523 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
9
Headline period
Q2 2026
Rows shown
1-9 of 9
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 1,534,916 | $48,687,125 | -$30,632,319 | $31.72 | 10 |
| 2026 Q2 | 14,452,955 | $158,074,442 | +$140,639,629 | $11.00 | 60 |
| 2026 Q1 | 1,610,597 | $7,655,139 | -$3,038,370 | $4.75 | 36 |
| 2025 Q4 | 2,055,041 | $13,255,450 | +$7,188,384 | $6.45 | 39 |
| 2025 Q3 | 865,123 | $8,581,114 | -$227,218 | $9.92 | 28 |
| 2025 Q2 | 884,339 | $8,816,100 | -$12,755,971 | $9.97 | 34 |
| 2025 Q1 | 1,689,433 | $24,295,053 | -$24,451,428 | $14.38 | 29 |
| 2024 Q4 | 1,735,848 | $93,599,486 | +$12,327,384 | $53.92 | 42 |
| 2024 Q3 | 2,274,493 | $7,960,753 | +$7,810,308 | $3.50 | 26 |