Quantum Corp: Barclays reports 5.60% passive stake

The reported voting and disposition authority is divided between sole power over 2,139,866 shares and shared power over 69,791 shares.

Available on EDGAR 11/06/2026 - 02:53 PM EST Accepted by SEC EDGAR 11/06/2026 - 02:52 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

Quantum Corp (QMCO) is the subject of a Schedule 13G reporting Barclays PLC beneficial ownership of 2,209,657 shares, or 5.60% of the class. Barclays PLC reports sole voting and dispositive power over 2,139,866 shares, and shared voting and dispositive power over 69,791 shares. It identifies Barclays Bank PLC, Barclays Capital Inc. and Barclays Capital Securities Ltd. as relevant subsidiaries.

Key Figures

Beneficial ownership: 2,209,657 shares Ownership of class: 5.60% Sole voting and dispositive power: 2,139,866 shares +1 more

4 metrics

Beneficial ownership 2,209,657 shares Barclays PLC's reported position

Ownership of class 5.60% Barclays PLC's reported position

Sole voting and dispositive power 2,139,866 shares Shares reported under sole power

Shared voting and dispositive power 69,791 shares Shares reported under shared power

Key Terms

beneficially owned, Sole power to vote or to direct the vote, Sole power to dispose or to direct the disposition of

3 terms

beneficially owned regulatory

"Amount beneficially owned: 2209657"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole power to vote or to direct the vote regulatory

"Sole power to vote or to direct the vote: 2139866"

Sole power to dispose or to direct the disposition of regulatory

"Sole power to dispose or to direct the disposition of: 2139866"

FAQ

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How many QMCO shares does Barclays PLC report owning?

Barclays PLC reports beneficial ownership of 2,209,657 QMCO shares, equal to 5.60% of the class.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

QUANTUM CORP

(Name of Issuer)

COMMON-STOCK

(Title of Class of Securities)

747906600

(CUSIP Number)

09/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 747906600

1

Names of Reporting Persons

Barclays PLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,139,866.00
6	Shared Voting Power 69,791.00
7	Sole Dispositive Power 2,139,866.00
8	Shared Dispositive Power 69,791.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,209,657.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.60 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: QUANTUM CORP
(b)	Address of issuer's principal executive offices: 10770 E. Briarwood Avenue, CO, 80112
Item 2.
(a)	Name of person filing: Barclays PLC
(b)	Address or principal business office or, if none, residence: 1 Churchill Place, London - E14 5HP
(c)	Citizenship: X0
(d)	Title of class of securities: COMMON-STOCK
(e)	CUSIP Number(s): 747906600
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 2209657
(b)	Percent of class: 5.60 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2139866
	(ii) Shared power to vote or to direct the vote: 69791
	(iii) Sole power to dispose or to direct the disposition of: 2139866
	(iv) Shared power to dispose or to direct the disposition of: 69791
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Barclays Bank PLC, Barclays Capital Inc, Barclays Capital Securities Ltd
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Barclays PLC

Signature:	Ramya Rao
Name/Title:	Director
Date:	11/06/2026