Security key
747906600
- Security type / class
- Equity / Common Stock
- Total 13F shares
- 25,508
- Total 13F value
- $279,648
- Share change
- -6,166
- SEC-reported price per share
- $11.00
- Number of holders
- 4
- Value change
- -$67,885
- Number of buys
- 1
- Number of sells
- 3
- Shares outstanding
- 42,231,838
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q2 2026
Institutions
4
Top holders
4
QMCO full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q1 2026
QUANTUM CORP /DE/ SEC filings
QUANTUM CORP /DE/ company facts
Broader feeds
Reporting periods
Holder history for CUSIP 747906600
Recent filing periods:
Ownership snapshot
Top reported holders of QMCO - QUANTUM CORP /DE/ - Common Stock (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Dialectic Technology SPV LLC
Disclosed value leader
Dialectic Technology SPV LLC
Comparable rows
15/15
Latest evidence
04 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 40%
13D/G row: Dialectic Technology SPV LLC
Showing 1-6 of 15 holder rows.
Quick read
Dialectic Technology SPV LLC leads the comparable SEC ownership view at 40%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Dialectic Technology SPV LLC's linked filing trail.
Comparable ownership
Top 5
Dialectic Technology SPV LLC
40%
VANGUARD GROUP INC
5%
Blue Torch Capital LP
2.3%
James J. Lerner
0.26%
Yue Zhou White
0.1%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Dialectic Technology SPV LLC |
13D/G
3/4/5
JOHN FICHTHORN · 10%+ Owner
|
40%
|
$151,021,051
16,892,735 shares
|
+$64,381,473 | 04 Jun 2026 |
| VANGUARD GROUP INC |
13D/G
The Vanguard Group
|
5%
|
$2,714,883
242,184 shares
|
$0 | 31 Dec 2024 |
| Blue Torch Capital LP |
13D/G
|
2.3%
|
$1,521,903
135,763 shares
|
-$3,029,110 | 13 Feb 2025 |
| James J. Lerner |
3/4/5
President & CEO, Director
|
0.26%
|
$1,069,550
110,848 shares
|
— | 21 Apr 2025 |
| Yue Zhou White |
3/4/5
Director
|
0.1%
|
$401,105
41,139 shares
|
— | 01 Jan 2026 |
| Don Jaworksi |
3/4/5
Director
|
0.09%
|
$386,831
39,675 shares
|
— | 01 Jan 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q2 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
4
Shares
25,508
Rows available
4
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q2 2026 vs Q1 2026 Across Filers
Q1 2026 holders
36
Q2 2026 holders
4
Holder diff
-32
| Investor | Q1 2026 Shares | Q2 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q2 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend