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Form SCHEDULE 13D/A QUANTUM CORP /DE/ Filed by: Dialectic Technology SPV LLC

June 8, 2026 9:15 PM





If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).




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SCHEDULE 13D




Comment for Type of Reporting Person:
The amount listed in Rows 8, 10 and 11 consists of 2,653,308 shares of Common Stock of the Issuer, par value $0.01 per share ("Common Stock"), issuable on the exercise of the Forbearance Warrant (as defined herein) ("Forbearance Warrant Shares"), 11,020,645 shares of Common Stock issued on the conversion of the Convertible Notes (as defined herein) ("Convert Shares"), 3,083,975 shares of Common Stock issued in connection with the Conversion (as described below) (the "Consideration Shares") and 105,911 shares of Common Stock issuable on the exercise of the Conversion Warrant (as defined herein) ("Conversion Warrant Shares"). The Reporting Persons will not have the power to vote or dispose of (i) the Forbearance Warrant Shares unless, and to the extent, Dialectic Technology SPV LLC ("Dialectic") exercises its right to acquire Forbearance Warrant Shares in accordance with the terms of the Forbearance Warrant and (ii) the Conversion Warrant Shares unless, and to the extent, Dialectic exercises its right to acquire Conversion Warrant Shares in accordance with the terms of the Conversion Warrant. The percentage calculated in Row 13 is based on a total of (i) 14,638,029 shares of Common Stock issued and outstanding of the Issuer as set forth in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on February 17, 2026 and (ii) 10,615,712 shares of Common Stock issued by the Issuer in connection with the private placement to certain investors as set forth in the Issuer's Current Report on Form 8-K filed with the SEC on June 2, 2026.


SCHEDULE 13D




Comment for Type of Reporting Person:
The amount listed in Rows 8, 10 and 11 consists of 2,653,308 Forbearance Warrant Shares, 11,020,645 Convert Shares, 3,083,975 Consideration Shares and 105,911 Conversion Warrant Shares. The Reporting Persons will not have the power to vote or dispose of (i) the Forbearance Warrant Shares unless, and to the extent, Dialectic exercises its right to acquire Forbearance Warrant Shares in accordance with the terms of the Forbearance Warrant and (ii) the Conversion Warrant Shares unless, and to the extent, Dialectic exercises its right to acquire Conversion Warrant Shares in accordance with the terms of the Conversion Warrant. The percentage calculated in Row 13 is based on a total of (i) 14,638,029 shares of Common Stock issued and outstanding of the Issuer as set forth in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on February 17, 2026 and (ii) 10,615,712 shares of Common Stock issued by the Issuer in connection with the private placement to certain investors as set forth in the Issuer's Current Report on Form 8-K filed with the SEC on June 2, 2026.


SCHEDULE 13D




Comment for Type of Reporting Person:
The amount listed in Rows 8, 10 and 11 consists of 2,653,308 Forbearance Warrant Shares, 11,020,645 Convert Shares, 3,083,975 Consideration Shares and 105,911 Conversion Warrant Shares. The Reporting Persons will not have the power to vote or dispose of (i) the Forbearance Warrant Shares unless, and to the extent, Dialectic exercises its right to acquire Forbearance Warrant Shares in accordance with the terms of the Forbearance Warrant and (ii) the Conversion Warrant Shares unless, and to the extent, Dialectic exercises its right to acquire Conversion Warrant Shares in accordance with the terms of the Conversion Warrant. The amount listed in Rows 7 and 9 consists of (i) 12,491 shares of Common Stock directly held by Mr. Fichthorn; and (ii) 16,405 restricted stock units ("RSUs") issued to Mr. Fichthorn in his capacity as a director of the Issuer. The percentage calculated in Row 13 is based on a total of (i) 14,638,029 shares of Common Stock issued and outstanding of the Issuer as set forth in the Issuer's Quarterly Report on Form 10-Q filed with the SEC on February 17, 2026 and (ii) 10,615,712 shares of Common Stock issued by the Issuer in connection with the private placement to certain investors as set forth in the Issuer's Current Report on Form 8-K filed with the SEC on June 2, 2026.


SCHEDULE 13D


Dialectic Technology SPV LLC
Signature:/s/ John Fichthorn
Name/Title:John Fichthorn / Authorized Signatory
Date:06/08/2026
Dialectic Technology Manager LLC
Signature:/s/ John Fichthorn
Name/Title:John Fichthorn / Manager
Date:06/08/2026
JOHN FICHTHORN
Signature:/s/ John Fichthorn
Name/Title:John Fichthorn
Date:06/08/2026

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