Quantum Corp (QMCO): Alyeska discloses 2.65M-share, 6.74% passive stake

Rhea-AI Filing Summary

Alyeska Investment Group, L.P., together with Alyeska Fund GP, LLC and Anand Parekh, reports passive ownership of Quantum Corporation common stock on a Schedule 13G. The reporting group beneficially owns 2,653,928 shares of common stock, representing 6.74% of the outstanding class.

The stake was acquired in a private placement and is held by Alyeska Master Fund, L.P., over which Alyeska Investment Group, L.P. exercises voting and investment control. All 2,653,928 shares are subject to shared voting and dispositive power, with no sole voting or dispositive power reported. Based on a total of 39,374,500 shares outstanding as referenced from Quantum Corporation’s Form 10-K, this position makes Alyeska a significant institutional holder. Anand Parekh may be deemed a beneficial owner due to his role as Chief Executive Officer of Alyeska Investment Group, L.P., but he disclaims beneficial ownership of these shares.

Key Figures

Beneficially owned shares: 2,653,928 shares Ownership percentage: 6.74% Shares outstanding: 39,374,500 shares +4 more

7 metrics

Beneficially owned shares 2,653,928 shares Common Stock, beneficially owned by the reporting persons

Ownership percentage 6.74% Percent of Quantum Corporation common stock class owned

Shares outstanding 39,374,500 shares Quantum common stock outstanding per Form 10-K dated 25 June 2026

Sole voting power 0 shares Shares with sole power to vote or direct the vote

Shared voting power 2,653,928 shares Shares with shared power to vote or direct the vote

Sole dispositive power 0 shares Shares with sole power to dispose or direct disposition

Shared dispositive power 2,653,928 shares Shares with shared power to dispose or direct disposition

Key Terms

Schedule 13G, beneficially owned, shared voting power, shared dispositive power, +2 more

6 terms

Schedule 13G regulatory

"Alyeska Investment Group, L.P. reports passive ownership of Quantum common stock on a Schedule 13G."

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.

beneficially owned financial

"As of 30 June 2026, the Reporting Persons beneficially own 2,653,928 shares of Common Stock acquired in a private placement."

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.

shared voting power financial

"Shared Voting Power 2,653,928.00 7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power 2,653,928.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Voting Power 2,653,928.00 7 | Sole Dispositive Power 0.00 8 | Shared Dispositive Power 2,653,928.00"

private placement financial

"the Reporting Persons beneficially own 2,653,928 shares of Common Stock acquired in a private placement."

A private placement is a sale of securities directly to a selected group of investors, typically institutions or accredited investors, instead of through a public offering. It lets a company raise money faster and with fewer regulatory steps; for existing shareholders it matters because the newly issued shares, often sold at a discount, increase the share count and can dilute their ownership.

Joint Filing Statement regulatory

"JOINT FILING STATEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement"

FAQ

What percentage of Quantum Corporation (QMCO) does Alyeska report owning?

Alyeska reports beneficial ownership of 6.74% of Quantum Corporation’s common stock. This corresponds to 2,653,928 shares, based on 39,374,500 shares outstanding referenced from Quantum’s Form 10-K.

How many Quantum Corporation (QMCO) shares does Alyeska beneficially own?

Alyeska and related reporting persons beneficially own 2,653,928 shares of Quantum Corporation common stock. The filing states these were acquired in a private placement and are held with shared voting and dispositive power.

How was Alyeska’s stake in Quantum Corporation (QMCO) acquired?

The Schedule 13G states the reporting persons’ 2,653,928 shares of Quantum common stock were acquired in a private placement. Alyeska Investment Group, L.P. exercises voting and investment control over shares held by Alyeska Master Fund, L.P.

What voting power does Alyeska report over Quantum Corporation (QMCO) shares?

The reporting persons disclose 0 shares with sole voting power and 2,653,928 shares with shared voting power. They likewise report 0 shares with sole dispositive power and 2,653,928 shares with shared dispositive power.

What share count did Alyeska use to calculate its 6.74% Quantum (QMCO) ownership?

The filing notes that the 6.74% ownership is based on 39,374,500 shares of Quantum common stock outstanding. This outstanding share count comes from Quantum Corporation’s Form 10-K dated 25 June 2026.

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Available on EDGAR 08/14/2026 - 04:32 PM Accepted by SEC EDGAR 08/14/2026 - 04:28 PM Learn about SEC filing dates

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

Alyeska Investment Group, L.P.

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 0.00
6	Shared Voting Power 2,653,928.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,653,928.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,653,928.00

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)

6.74 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 747906600

1

Names of Reporting Persons

Alyeska Fund GP, LLC

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 0.00
6	Shared Voting Power 2,653,928.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,653,928.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,653,928.00

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)

6.74 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 747906600

1

Names of Reporting Persons

Anand Parekh

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 STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 2,653,928.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 2,653,928.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,653,928.00

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)

6.74 %

12

Type of Reporting Person (See Instructions)

IN

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: (i) Alyeska Investment Group, L.P. (ii) Alyeska Fund GP, LLC (iii) Anand Parekh
(b)	Address or principal business office or, if none, residence: (i) 77 West Wacker Drive, 7th Floor, Chicago, IL 60601 (ii) 77 West Wacker Drive, 7th Floor, Chicago, IL 60601 (iii) 77 West Wacker Drive, 7th Floor, Chicago, IL 60601
(c)	Citizenship: (i) Alyeska Investment Group, L.P. - Delaware (ii) Alyeska Fund GP, LLC - Delaware (iii) Anand Parekh - United States of America
(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: 2,653,928
(b)	Percent of class: 6.74%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 2,653,928
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 2,653,928
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.

Alyeska Investment Group, L.P.

Signature:	Jason Bragg
Name/Title:	Jason Bragg | Chief Financial Officer
Date:	08/14/2026

Alyeska Fund GP, LLC

Signature:	Jason Bragg
Name/Title:	Jason Bragg | Chief Financial Officer
Date:	08/14/2026

Anand Parekh

Signature:	Anand Parekh
Name/Title:	Anand Parekh | Self
Date:	08/14/2026

Exhibit Information

As of 30 June 2026, the Reporting Persons beneficially own 2,653,928 shares of Common Stock acquired in a private placement. The number of shares of Common Stock outstanding (39,374,500) is based on the Form 10-K dated 25 June 2026. Position held by Alyeska Master Fund, L.P. Alyeska Investment Group, L.P., as investment manager, exercises voting and investment control over the shares held by Alyeska Master Fund, L.P. Anand Parekh, as Chief Executive Officer of Alyeska Investment Group, L.P., may be deemed the beneficial owner of such shares. Mr. Parekh disclaims beneficial ownership of such shares. JOINT FILING STATEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on SCHEDULE 13G, is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on SCHEDULE 13G, shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.