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QMCO · Additional Proxy Materials (DEFA14A) · Filed December 2, 2025

Quantum Corp — Additional Proxy Materials (DEFA14A)

Form
DEFA14A
Filed
December 2, 2025
Ticker
QMCO
Accession
0000709283-25-000087
Quantum Corp on Boardroom AlphaView on SEC EDGAR
Boardroom Alpha · Filing insights

No material governance developments; Quantum's filing contains only voting reminders for the Dec 15 deadline. Consult the filing for more details.

About Quantum Corp
Market cap
$184M
1Y TSR
−12.2%
3Y TSR
−25.6%
Board grade
C-
Sector
Technology
CEO
Hugues Meyrath
Last annual meeting: Dec 16, 2025 · View full Quantum Corp profile →
Document


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:
☐ Preliminary Proxy Statement
☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐ Definitive Proxy Statement
☒ Definitive Additional Materials
☐ Soliciting Material Pursuant to Section 240.14a-12

qlogo.jpg
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):
☒ No fee required.
☐ Fee paid previously with preliminary materials.
☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.







1

[Social media posts first used on or after December 2, 2025]
image_0.jpg
Voting your Quantum shares is quick and easy.

Please submit your vote before the Dec 15 deadline (11:59 PM ET) ahead of the Dec 16 Annual Meeting.

Vote now: [link to 2025 Annual Meeting landing page]
#QuantumCorp #ShareholderVote #QMCO
image_1.jpg
Don’t forget to vote!

Quantum’s voting cut-off is Dec 15 at 11:59 PM ET ahead of the Dec 16 Annual Meeting.

[link to 2025 Annual Meeting landing page]
#QuantumCorp #ShareholderVote #QMCO


image_2.jpg
A reminder for Quantum shareholders:
Please submit your vote ahead of the Dec 15, 11:59 PM ET cut-off.

The Annual Meeting will be held Dec 16.

Vote now: [link to 2025 Annual Meeting landing page]
#QuantumCorp #ShareholderVote #QMCO

image_3.jpg
Quantum shareholders: please vote your shares by 11:59 PM ET on Dec 15 in advance of the Dec 16 Annual Meeting.

Vote here → [link to 2025 Annual Meeting landing page]
#QuantumCorp #ShareholderVote #QMCO


image_4.jpg
Quantum shareholders are reminded to vote their shares ahead of the Dec 15 at 11:59 PM ET voting deadline.

The Annual Meeting will be held on Dec 16.

Vote here: [link to 2025 Annual Meeting landing page]
#QuantumCorp #ShareholderVote #QMCO
image_5.jpg
A reminder to Quantum shareholders: Please submit your vote before the Dec 15 (11:59 PM ET) cut-off to participate in the Dec 16 Annual Meeting.

Vote here: [link to 2025 Annual Meeting landing page]
#QuantumCorp #ShareholderVote #QMCO

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Reference

Frequently asked questions

When did Quantum Corp file this DEFA14A?
Quantum Corp (QMCO) filed this Additional Proxy Materials (DEFA14A) with the SEC on December 2, 2025. The accession number assigned by EDGAR is 0000709283-25-000087.
What does a DEFA14A disclose?
DEFA14A is additional definitive proxy soliciting material filed in connection with a shareholder meeting — supplemental letters, slides, or amendments issued after the main proxy statement.
What is the key takeaway from this filing?
No material governance developments; Quantum's filing contains only voting reminders for the Dec 15 deadline. Consult the filing for more details. This is Boardroom Alpha's one-line summary of the additional proxy materials; see the full filing text above for the formal disclosure.
Where can I find Quantum Corp's prior proxy statements on EDGAR?
The SEC EDGAR browser lists every DEFA14A Quantum Corp has filed under CIK 709283, sortable by date. Use the "View on SEC EDGAR" link in the page header, or browse directly via https://www.sec.gov/cgi-bin/browse-edgar.
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