13D Filings
QUANTUM CORP /DE/
QMCO
Amendment
Ownership

41.40%

Total Shares

9,691,228

Issuer CIK

709283

CUSIP

747906600

Event Date

Jan 7, 2026

Accepted

Jan 12, 2026, 06:58 PM

Reporting Persons (3)
Joint Filing

This is a joint filing. The reported shares may overlap between reporting persons and should not be summed.

NameType% of ClassAggregateSole VotingShared Voting
JOHN FICHTHORN
Employee Benefit Plan
41.40%9,691,22827,2719,663,957
Dialectic Technology SPV LLC
Investment Company
41.30%9,663,95709,663,957
Dialectic Technology Manager LLC
Investment Company
41.30%9,663,95709,663,957
Disclosure Items (5)

Security Title

Common Stock

Issuer Name

QUANTUM CORP /DE/

Issuer Address

10770 E. Briarwood Avenue, Centennial, CO, 80112

Item 3 of the Amended Statement is hereby amended by adding the following to the end thereof: The information set forth in Item 4 of Amendment No. 2 is incorporated herein by reference.

Item 4 of the Amended Statement is hereby amended by adding the following paragraphs to the end of Item 4: January 8, 2026 Conversion Price Adjustment Notice On January 8, 2026, the Issuer notified Dialectic that, effective after the close of business on the most recent Reset Price Date (being December 31, 2025), the Conversion Price of the Convertible Notes was automatically adjusted pursuant to the quarterly reset provisions of the Indenture, from $10.00 to $7.8050. After giving effect to such adjustment, the Convertible Notes are convertible into an aggregate of 7,010,649 shares of Common Stock. RSU Issuance to Mr. Fichthorn On January 1, 2026, Mr. Fichthorn was issued 12,000 RSUs in connection with his continued service on the Issuer's Board of Directors. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The RSUs vest in full on the earlier of January 1, 2027 or the date of the Company's next annual meeting of stockholders, in each case subject to Mr. Fichthorn's continued service on the Issuer's Board of Directors.

Percentage of Class

See rows (11) and (13) of the cover page to this Schedule 13D for the aggregate number of shares of Common Stock and percentage of Common Stock that would be beneficially owned by each Reporting Person upon (i) the exercise in full (and for cash, not on a net-exercise basis) of the Forbearance Warrant and (ii) the conversion of the Convertible Notes. The aggregate percentage of Common Stock reported beneficially owned by each Reporting Person upon exercise of the Forbearance Warrant and full conversion of the Convertible Notes is based upon 13,721,291 shares of Common Stock outstanding as of November 11, 2025, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on November 13, 2025.

Number of Shares

See rows (7) through (10) of the cover page to this Schedule 13D for the shares of Common Stock as to which each Reporting Person would have the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition upon (i) the exercise in full (and for cash, not on a net-exercise basis) of the Forbearance Warrant and (ii) the conversion of the Convertible Notes. Dialectic would directly hold any Common Stock beneficially owned by it upon any exercise of the Forbearance Warrant and the conversion of the Convertible Notes. Dialectic Manager, as the manager of Dialectic, and Mr. Fichthorn, as the Manager of Dialectic Manager, may each be deemed to have the shared power to direct the voting and disposition of shares of Common Stock owned by Dialectic and, consequently, Mr. Fichthorn and Dialectic Manager may each be deemed to possess indirect beneficial ownership of such shares upon (i) any exercise by Dialectic of the Forbearance Warrant and (ii) the conversion of the Convertible Notes. Mr. Fichthorn and Dialectic Manager disclaim beneficial ownership of such shares for all other purposes. Without giving effect to any exercise of the Forbearance Warrant or conversion of the Convertible Notes, Mr. Fichthorn directly holds and has the sole power to vote and dispose of 10,866 shares of Common Stock and 16,405 RSUs.

Transactions

Except as described in Item 4 of this Amendment, no transactions in shares of Common Stock have been effected by the Reporting Persons since the filing of Amendment No. 1.

Shareholders

Other than the Reporting Persons, no persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of Common Stock reported herein.

Date of 5% Ownership

Not applicable.

Item 6 of the Amended Statement is hereby amended by adding the following to the end thereof: The information set forth in Item 4 of Amendment No. 2 is incorporated herein by reference.

QUANTUM CORP /DE/ — Schedule 13D | 13D Filings