(QMCO)

Reporting relationship: Chief Operating Officer
Issuer ticker: QMCO
Reported as of: 01 Oct 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 05 Oct 2026, 17:16:51 UTC
Prior SEC filing: 05 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Tara Ilges, attorney-in-fact for James C. Clancy

Key filing fact

James C. Clancy filed Form 4 for QUANTUM CORP /DE/ (QMCO) on 05 Oct 2026.

Key facts

This page summarizes James C. Clancy's Form 4 filing for QUANTUM CORP /DE/ (QMCO).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 05 Oct 2026, 17:16.

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 0002085977 Primary reporting owner

Clancy James C

Relationship: Chief Operating Officer
Address: C/O QUANTUM CORPORATION, 10770 E. BRIARWOOD AVE, CENTENNIAL
Signature: /s/ Tara Ilges, attorney-in-fact for James C. Clancy
Signature date: 05 Oct 2026

Reported non-derivative transactions

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

QMCO transaction

Common Stock

Award

Transaction value
Shares: +150,000
Change %: +1154%
Price: $0.000000^*
Shares after: 163,000
Date: 01 Oct 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

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

QMCO transaction Derivative

Employee Stock Option (right to buy)

Award

Transaction value
Shares: +400,000
Change %
Price: $0.000000^*
Shares after: 400,000
Date: 01 Oct 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 400,000
Exercise price: $31.88
Footnotes: F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Grant of restricted stock units (RSUs), each of which represents a contingent right to receive one share of common stock of QMCO. The RSUs vest in three equal annual installments beginning on October 1, 2027, with a vesting commencement date of October 1, 2026, subject to the Reporting Persons continued service through each vesting date.

Footnote F2

This nonstatutory stock option vests over four years in equal monthly installments beginning on November 1, 2026, with a vesting commencement date of October 1, 2026, subject to the Reporting Persons continued service through each vesting date.