QUANTUM CORP /DE/

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934 (Amendment No. )

Filed by the Registrant ☒

Filed by a party other than the Registrant ☐

Check the appropriate box:

Quantum Corporation

(Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

A Message from Hugues

What a difference a year makes.

When I became President and Chief Executive Officer of Quantum just over one year ago, I told you I was passionately focused on driving the company toward successfully achieving the opportunities ahead of us and defining a future that could deliver positive outcomes for all stakeholders.

I have done my best to fulfill those expectations. One year later, we have eliminated our debt, strengthened our balance sheet, increased our enterprise value, demonstrated consistent revenue improvement, and reconstituted our executive management and senior leadership teams.

But there is still work to do. While the last fiscal year required transformation, the current one demands continued execution and resilience. We face new supply chain challenges that we are working hard to navigate and overcome, leaving us more disciplined, better educated, and increasingly prepared for future challenges. Our products have helped keep customers’ data accessible and secure from external events that caused significant impact to their facilities and operations, and we are leveraging that expertise to help protect other critical infrastructure in our customer base. At the same time, we are pushing our own boundaries for product design, sales expectations, and operational rigor to challenge ourselves to go farther, move faster, and perform more effectively every day.

Through it all, we have asked our employees to adapt, learn, and grow with us, and to exceed your expectations for what we can collectively do. We have demanded that even in the face of those challenges, we lead with our values of integrity, ownership, and urgency held high. The team has responded beyond what I could have predicted, and we think it’s important to recognize that the changes we’ve made this year would not have been possible without the patience, flexibility, and dedication of Quantum employees. We believe your support for our proxy proposals will give us the ability to reward them for their instrumental contributions to our success. We also believe that voting for our proposals helps align the company, our employees, and our shareholders toward the same goal: driving predictable performance and delivering consistent results that increase Quantum’s value for all stakeholders.

Last year, I said that I came back to Quantum because Quantum is in my blood. My commitment to defining high expectations and being accountable for even higher performance runs deep as well. I look forward to continuing to reintroduce you to the Quantum I know – the one that believes that what wasn’t possible yesterday can be realized today and becomes the foundation for tomorrow. Your support makes that foundation even stronger.

Hugues Meyrath

President and Chief Executive Officer

Notice of Annual Meeting of Shareholders

Quantum Corporation (Quantum or the Company) invites you to attend our 2026 annual meeting of shareholders (Annual Meeting) on Tuesday, September 15, 2026, beginning promptly at 8:30 a.m. Pacific Time. At the meeting, we will consider and vote on the following proposals:

Only shareholders of record at the close of business on July 20, 2026 (the Record Date), or their valid proxy holders, may vote at the meeting. Our Board of Directors (Board) recommends you vote “FOR” each of the nominees in Proposal One, and “FOR” Proposals Two, Three, and Four.

Important Notice Regarding the Availability of Proxy Materials

The following pages set forth our 2026 proxy statement, including more complete descriptions of proposals and Board candidates. The proxy statement and our Annual Report on Form 10-K are also available at www.proxyvote.com.

To reduce the environmental impacts of our proxy process, shareholders will not automatically receive paper copies of our proxy statement and annual report. We will instead send a Notice of Internet Availability (Notice) with instructions for accessing the proxy materials and voting online. The notice will also provide information about how shareholders may obtain paper copies of proxy materials if they prefer. Our Notice is first being sent on or about July 29, 2026 to all shareholders entitled to vote at the Annual Meeting.

Quantum knows of no other matters to be submitted at the Annual Meeting. As Corporate Secretary, I must receive any shareholder proposals intended for consideration at the Annual Meeting (including their required information) within the timeframes specified in our Bylaws and required by the rules of the Securities and Exchange Commission (SEC). If any other matters properly come before the Annual Meeting, the individuals named in the form of proxy will vote the shares they represent as the Board may recommend.

By Order of the Board of Directors,

Tara Ilges

General Counsel and Corporate Secretary

July 29, 2026

Table of Contents