(QMCO)

Reporting relationship: Director, 10%+ Owner
Issuer ticker: QMCO
Reported as of: 01 Jun 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 08 Jun 2026, 21:54:36 UTC
Prior SEC filing: 05 Jan 2026
Source filing: View source filing
Reporting owner signature: Tara Ilges, attorney-in-fact for John A. Fichthorn

Key filing fact

John A. Fichthorn filed Form 4 for QUANTUM CORP /DE/ (QMCO) on 08 Jun 2026.

Key facts

This page summarizes John A. Fichthorn's Form 4 filing for QUANTUM CORP /DE/ (QMCO).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 08 Jun 2026, 21:54.

Change

Previous filing in this sequence was filed on 05 Jan 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001411509 Primary reporting owner

FICHTHORN JOHN

Relationship: Director, 10%+ Owner
Address: C/O QUANTUM CORPORATION, 10770 E. BRIARWOOD AVE., CENTENNIAL
Signature: Tara Ilges, attorney-in-fact for John A. Fichthorn
Signature date: 08 Jun 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

QMCO transaction

Common Stock

Conversion of derivative security

Transaction value
Shares: +11,020,645
Change %
Price: $5.19^*
Shares after: 11,020,645
Date: 04 Jun 2026
Ownership: by Dialectic Technology SPV LLC
Footnotes: F1, F2, F3

QMCO transaction

Common Stock

Award

Transaction value
Shares: +3,083,975
Change %: +28%
Price: $5.19^*
Shares after: 14,104,620
Date: 04 Jun 2026
Ownership: by Dialectic Technology SPV LLC
Footnotes: F1, F2, F3, F4

QMCO holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 28,896
Date: 01 Jun 2026
Ownership: Direct
Footnotes: F5

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

QMCO transaction Derivative

Warrant (right to buy)

Other

Transaction value
Shares: +105,911
Change %
Price
Shares after: 105,911
Date: 01 Jun 2026
Ownership: by Dialectic Technology SPV LLC
Underlying class: Common Stock
Underlying amount: 105,911
Exercise price: $5.19
Footnotes: F3, F6

QMCO transaction Derivative

Convertible Notes

Conversion of derivative security

Transaction value
Shares: -57,241,228
Change %: -100%
Price
Shares after: 0
Date: 04 Jun 2026
Ownership: by Dialectic Technology SPV LLC
Underlying class: Common Stock
Underlying amount: 11,020,645
Exercise price: $5.19
Footnotes: F1, F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

On June 4, 2026 (the "Closing Date"), pursuant to a Conversion Agreement dated June 1, 2026 (the "Conversion Agreement"), by and among, among others, the Issuer and Dialectic (as defined below), Dialectic converted $57,241,228.00 of the previously issued 10.00% PIK senior secured convertible notes due 2028 (the "Convertible Notes"), consisting of the entire principal amount and all accrued and unpaid interest thereon, subject to certain conditions set forth in the Conversion Agreement (the "Conversion").

Footnote F2

In connection with the Conversion, on the Closing Date, the Convertible Notes were cancelled, and the Issuer issued to Dialectic 11,020,645 shares of Common Stock (as defined below).

Footnote F3

These securities are held directly by Dialectic, a 10% holder of the Issuer, and indirectly by John Fichthorn. Mr. Fichthorn is the Manager of Dialectic Technology Manager LLC, the Manager of Dialectic. The Reporting Person disclaims beneficial ownership of these securities, except to the extent of the Reporting Person's pecuniary interest therein, if any.

Footnote F4

On the Closing Date, as consideration for the Conversion, the Issuer issued to Dialectic, (i) 3,083,975 additional shares of Common Stock (the "Consideration Shares"), which represents the quotient of (A) approximately $13.0 million, the present value of nominal PIK interest that would accrue on the Convertible Notes from the Closing Date to the maturity date thereof, discounted at a rate of 11%, plus (B) approximately $3.0 million, the Term Loan Deferred Cash Interest Amount (as defined in the Credit Agreement) owed to Dialectic, divided by $5.194.

Footnote F5

Includes 1,625 shares of Common Stock received by the Reporting Report as a result of a distribution of assets from a trust on June 1, 2026, which shares previously held indirectly by such trust were previously inadvertently omitted.

Footnote F6

On June 1, 2026 ("Issuance Date"), the Issuer issued to Dialectic Technology SPV LLC ("Dialectic") a warrant (the "Conversion Warrant") to purchase 105,911 (as may be adjusted pursuant to the Conversion Warrant) shares of common stock, par value $0.01 per share of the Issuer (the "Common Stock"), at an exercise price equal to $5.194 per share (as adjusted from time to time in accordance with the Conversion Warrant) on or after the Issuance Date and until the date that is five (5) years from the Issuance Date.