[Form 4] QUANTUM CORP /DE/ Insider Trading Activity

Rhea-AI Filing Summary

Laura A. Nash, Chief Accounting Officer of Quantum Corp (QMCO), reported transactions on Form 4 showing equity vesting and automatic share sales to cover taxes. On 10/01/2025 Ms. Nash received 500 shares (performance‑based stock units) at a purchase price of $0 upon vesting. On the same date she sold 118 shares at a weighted average price of $9.91, and on 10/02/2025 she sold 611 shares at a weighted average price of $10.86. The filings state the October 1 sales and October 2 sales were block trades executed for multiple holders and that the share disposals were automatic, non‑discretionary sales to cover tax withholding for vested awards. Beneficial ownership reported changed from 11,868 shares after the acquisition to 11,139 shares following the October 2 sale.

Insights

Corporate Governance Analyst

Officer reported vesting of $0 PSU shares and automatic sales of 729 shares to cover taxes.

The Form 4 discloses the vesting of 500 performance‑based shares on 10/01/2025 and automatic sales of 118 and 611 shares on 10/01/2025 and 10/02/2025 respectively to satisfy tax withholding obligations.

This is a routine compensation settlement rather than a discretionary sale; the filing notes the transactions were non‑discretionary and performed as block trades for multiple holders. The filing also documents the change in beneficial ownership to 11,139 shares after the transactions.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Nash Laura A.

(Last) (First) (Middle)

C/O QUANTUM CORPORATION

10770 E. BRIARWOOD AVE

(Street)

CENTENNIAL CO 80112

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
QUANTUM CORP /DE/ [ QMCO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Accounting Officer

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	10/01/2025		A		500	A	$0	11,868	D
Common Stock	10/01/2025		S		118(1)	D	$9.91(2)	11,750	D
Common Stock	10/02/2025		S		611(3)	D	$10.86(4)	11,139	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the number of shares automatically sold on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of performance-based stock units granted on July 1, 2023.

2. Represents a weighted average price. These shares were sold as part of block trades for multiple security holders of the issuer on October 1, 2025, at a price ranging from $9.9026 to $9.9118. The reporting person undertakes to provide upon request by the Securities and Exchange Commission, the issuer, or a securityholder of the issuer detailed information regarding the number of shares sold and the prices at which the transactions were executed.

3. Represents the number of shares automatically sold on a non-discretionary basis, to cover tax withholding obligations in connection with the vesting of restricted stock units granted on October 1, 2024.

4. Represents a weighted average price. These shares were sold as part of block trades for multiple security holders of the issuer on October 2, 2025, at a price ranging from $10.85 to $10.87. The reporting person undertakes to provide upon request by the Securities and Exchange Commission, the issuer, or a securityholder of the issuer detailed information regarding the number of shares sold and the prices at which the transactions were executed.

Remarks:

	/s/ Tara Ilges, Attorney-in-Fact for Laura A. Nash	10/03/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Laura A. Nash report on the QMCO Form 4?

The filing reports that 500 performance‑based shares vested on 10/01/2025 and that 118 shares were sold on 10/01/2025 at a weighted average $9.91 and 611 shares were sold on 10/02/2025 at a weighted average $10.86.

Why were shares sold by the reporting person on QMCO Form 4?

The filing states the shares were sold automatically on a non‑discretionary basis to cover tax withholding obligations related to the vesting of equity awards.

How did these transactions affect Laura Nash's beneficial ownership of QMCO shares?

Following the reported transactions the filing shows beneficial ownership of 11,139 shares, down from 11,868 immediately after the acquisition entry.

What prices were disclosed for the sales in the Form 4?

The October 1 block trades had a weighted average price of $9.91 (range $9.9026–$9.9118) and the October 2 block trades had a weighted average price of $10.86 (range $10.85–$10.87), per the filing.

Who signed the Form 4 for Laura A. Nash?

The Form 4 was signed by Tara Ilges, Attorney‑in‑Fact for Laura A. Nash, on 10/03/2025.