Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Dialectic Technology SPV LLC - 04 Jun 2026 SCHEDULE 13D/A Report for QUANTUM CORP /DE/ Common Stock (QMCO)
- Filing manager
- Dialectic Technology SPV LLC
- Reporting owner
- JOHN FICHTHORN
- Security
- QUANTUM CORP /DE/ Common Stock
- Beneficially owned shares
- 16,892,735 shares
- Large-stake signal
-
Ownership
40%Beneficial ownership of this reported class.
Shares
16,892,735 sharesShares beneficially owned as disclosed.
Event date
04 Jun 2026Date tied to the ownership event or amendment.
Accepted by SEC
08 Jun 2026EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 40%
- Symbol
- QMCO
- Shares outstanding
- 42,231,838 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 08 Jun 2026, 21:14:33 UTC
- Event date
- 04 Jun 2026
- Prior SEC filing
- 12 Jan 2026
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
5 source fields
Key filing fact
Dialectic Technology SPV LLC disclosed 40% ownership in QUANTUM CORP /DE/ Common Stock (QMCO) on 04 Jun 2026.
Key facts
- Dialectic Technology SPV LLC filed SCHEDULE 13D/A for QUANTUM CORP /DE/ Common Stock (QMCO).
- Disclosed ownership: 40%.
- Date of event: 04 Jun 2026.
Change
- Previous schedule filing date: 12 Jan 2026.
- Current filing was accepted on 08 Jun 2026, 21:14.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (3)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Dialectic Technology SPV LLC | 40% | 16,863,839 | 0 | 16,863,839 | /s/ John Fichthorn | John Fichthorn / Authorized Signatory | 0002055322 |
| Dialectic Technology Manager LLC | 40% | 16,863,839 | 0 | 16,863,839 | /s/ John Fichthorn | John Fichthorn / Manager | 0002105254 |
| JOHN FICHTHORN | 40% | 16,892,735 | 28,896 | 16,863,839 | /s/ John Fichthorn | John Fichthorn | 0001411509 |
CIK / CUSIP context first