Oaktree Capital Management (QMCO) discloses 5.11% beneficial stake in Quantum

Rhea-AI Filing Summary

Oaktree Capital Management LP filed a Schedule 13G reporting beneficial ownership of 2,011,678 shares of Quantum Corporation common stock. This represents 5.11% of the outstanding common stock, based on 39,374,500 shares outstanding as of June 24, 2026, as reported by Quantum.

Oaktree reports sole voting and sole dispositive power over all 2,011,678 shares, with no shared voting or dispositive power. The shares are directly held by several Oaktree-managed funds and accounts, and Oaktree states that the filing should not be deemed an admission of beneficial ownership for Section 13(d) or 13(g) purposes.

Key Figures

Shares beneficially owned: 2,011,678 shares Percent of class: 5.11% Shares outstanding baseline: 39,374,500 shares +2 more

5 metrics

Shares beneficially owned 2,011,678 shares Quantum Corporation common stock reported by Oaktree Capital Management LP

Percent of class 5.11% Portion of Quantum common stock beneficially owned by Oaktree

Shares outstanding baseline 39,374,500 shares Quantum common stock outstanding as of June 24, 2026, from Quantum’s Form 10-K

Sole voting power 2,011,678 shares Shares over which Oaktree reports sole power to vote

Sole dispositive power 2,011,678 shares Shares over which Oaktree reports sole power to dispose

Key Terms

Schedule 13G, beneficial ownership, sole voting power, sole dispositive power, +1 more

5 terms

Schedule 13G regulatory

"Oaktree Capital Management LP filed a Schedule 13G reporting beneficial ownership"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficial ownership financial

"Amount beneficially owned: See response to row 9 on the cover page"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole voting power financial

"5 | Sole Voting Power 2,011,678.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power financial

"7 | Sole Dispositive Power 2,011,678.00"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

percent of class financial

"(b) | Percent of class: See response to row 11 on the cover page"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

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

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Available on EDGAR 08/10/2026 - 04:17 PM Accepted by SEC EDGAR 08/10/2026 - 04:15 PM Learn about SEC filing dates

FAQ

What percentage of Quantum (QMCO) shares does Oaktree Capital Management report owning?

Oaktree Capital Management reports beneficial ownership of 5.11% of Quantum’s common stock. This percentage is based on 39,374,500 Quantum shares outstanding as of June 24, 2026, as reported in Quantum’s Form 10-K.

How many Quantum (QMCO) shares does Oaktree Capital Management beneficially own?

Oaktree Capital Management reports beneficial ownership of 2,011,678 Quantum common shares. Oaktree also reports sole voting and sole dispositive power over these shares, with no shared voting or dispositive power.

What is the share count used to calculate Oaktree’s 5.11% stake in Quantum (QMCO)?

The 5.11% stake is calculated using 39,374,500 shares of Quantum common stock outstanding as of June 24, 2026, as reported in Quantum’s Form 10-K filed on June 25, 2026.

Does Oaktree Capital Management share voting power over its Quantum (QMCO) shares?

No. Oaktree Capital Management reports sole voting power over 2,011,678 shares and shared voting power of 0. It also reports sole dispositive power over the same 2,011,678 shares and no shared dispositive power.

Which entities directly hold the Quantum (QMCO) shares managed by Oaktree?

The reported Quantum shares are directly held by funds and accounts managed by Oaktree, including Oaktree Value Opportunities Fund Holdings, L.P., Oaktree London Liquid Value Opportunities Fund (VOF), L.P., and Boston Patriot Arlington St LLC.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Quantum Corporation

(Name of Issuer)

Common Stock, $0.01 par value per share

(Title of Class of Securities)

747906600

(CUSIP Number)

06/30/2026

(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

Oaktree Capital Management LP

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,011,678.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,011,678.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,011,678.00

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)

5.11 %

12

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person: The reported percentage is calculated based on 39,374,500 shares of common stock ("Common Stock") outstanding as of June 24, 2026, as reported on the Issuer's 10-K filed with the Securities and Exchange Commission on June 25, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Quantum Corporation
(b)	Address of issuer's principal executive offices: 10770 E. Briarwood Avenue, Centennial, CO 80112
Item 2.
(a)	Name of person filing: This Statement is filed by Oaktree Capital Management LP, referred to herein as the "Reporting Person."
(b)	Address or principal business office or, if none, residence: 333 S. Grand Ave., 28th Floor, Los Angeles, CA 90071
(c)	Citizenship: See response to row 4 on the cover page hereto.
(d)	Title of class of securities: Common Stock, $0.01 par value per share
(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: See response to row 9 on the cover page hereto. The reported securities are directly held by the following funds and accounts, each managed by the Reporting Person: (i) Oaktree Value Opportunities Fund Holdings, L.P.; (ii) Oaktree London Liquid Value Opportunities Fund (VOF), L.P.; and (iii) Boston Patriot Arlington St LLC. The filing of this Statement shall not be deemed an admission of beneficial ownership by the Reporting Person for purposes of Section 13(d) or 13(g) or for any other purpose.
(b)	Percent of class: See response to row 11 on the cover page hereto.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See response to row 5 on the cover page hereto.
	(ii) Shared power to vote or to direct the vote: See response to row 6 on the cover page hereto.
	(iii) Sole power to dispose or to direct the disposition of: See response to row 7 on the cover page hereto.
	(iv) Shared power to dispose or to direct the disposition of: See response to row 8 on the cover page hereto.
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.
	Not Applicable
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.

Oaktree Capital Management LP

Signature:	/s/ Henry Orren
Name/Title:	Henry Orren / Managing Director
Date:	08/10/2026