# EDGAR Filing Document

**Accession Number:** 0000709283
**File Stem:** 0000709283-25-000061
**Filing Date:** 2025-10
**Character Count:** 9611
**Document Hash:** 8dbe2424430a127c668b1fb39c6e99ba
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000709283-25-000061.hdr.sgml**: 20251006

**ACCESSION NUMBER**: 0000709283-25-000061

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 14

**CONFORMED PERIOD OF REPORT**: 20250930

**ITEM INFORMATION**: Changes in Registrant's Certifying Accountant

**FILED AS OF DATE**: 20251006

**DATE AS OF CHANGE**: 20251006

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** QUANTUM CORP /DE/
- **CENTRAL INDEX KEY:** 0000709283
- **STANDARD INDUSTRIAL CLASSIFICATION:** COMPUTER STORAGE DEVICES [3572]
- **ORGANIZATION NAME:** 06 Technology
- **EIN:** 942665054
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0331

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-13449
- **FILM NUMBER:** 251376849

**BUSINESS ADDRESS:**
- **STREET 1:** 224 AIRPORT PARKWAY
- **STREET 2:** SUITE 550
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95110
- **BUSINESS PHONE:** 408 944 4000

**MAIL ADDRESS:**
- **STREET 1:** 224 AIRPORT PARKWAY
- **STREET 2:** SUITE 550
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95110

?xml version='1.0' encoding='ASCII'? qtm-20250930

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM 8-K**

**CURRENT REPORT**

**Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934**

Date of Report (Date of earliest event reported): September 30, 2025

![Q logo.jpg](qtm-20250930_g1.jpg)

---

| |
|:---|
| **Quantum Corporation** |
| (Exact name of registrant as specified in its charter) |

---

---

| | | | |
|:---|:---|:---|:---|
| **Delaware** | **Delaware** | **001-13449** | **94-2665054** |
| (State or other jurisdiction of incorporation or organization) | (State or other jurisdiction of incorporation or organization) | (Commission File No.) | (I.R.S. Employer Identification No.) |
| **10770 E. Briarwood Avenue** | **10770 E. Briarwood Avenue** |  |  |
| **Centennial,** | **CO** |  | **80112** |
| (Address of Principal Executive Offices) | (Address of Principal Executive Offices) |  | (Zip Code) |

---

---

| | |
|:---|:---|
| **(408)** | **944-4000** |
| Registrant's telephone number, including area code | Registrant's telephone number, including area code |

---

---

| |
|:---|
| **N/A** |
| (Former name, former address and former fiscal year, if changed since last report) |

---

Securities registered pursuant to Section 12(b) of the Act:

---

| | | |
|:---|:---|:---|
| Title of each class | Trading Symbol | Name of each exchange on which registered |
| Common Stock, $0.01 par value per share | QMCO | Nasdaq Global Market |

---

Check the appropriate box below if the Form 8-K ﬁling is intended to simultaneously satisfy the ﬁling obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

**Item 4.01 Changes in Registrant's Certifying Accountant.**

*Dismissal of Independent Registered Public Accounting Firm* 

The Audit Committee (the "Audit Committee") of the Board of Directors of Quantum Corporation (the "Company") conducted a competitive process to determine the Company's independent registered public accounting firm for the fiscal year ending March 31, 2026. As a result of this process and following careful deliberation, on September 30, 2025, the Audit Committee dismissed Grant Thornton LLP ("Grant Thornton") as the Company's independent registered public accounting firm, effective as of that same date.

Grant Thornton's reports on the Company's consolidated financial statements as of and for the fiscal years ended March 31, 2025 and 2024 did not contain any adverse opinion or disclaimer of opinion and were not qualified or modified as to uncertainty, audit scope, or accounting principles, other than the explanatory paragraph regarding the Company's ability to continue as a going concern.

During the Company's fiscal years ended March 31, 2025 and 2024 and the subsequent interim period through September 30, 2025, there were no "disagreements" (as defined in Item 304(a)(1)(iv) of Regulation S-K and related instructions thereto) between the Company and Grant Thornton on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to the satisfaction of Grant Thornton, would have caused Grant Thornton to make reference to the subject matter of the disagreement in connection with its report.

Additionally, during the fiscal years ended March 31, 2025 and 2024 and subsequent interim period through September 30, 2025, there have been no "reportable events" (as defined in Item 304(a)(1)(v) of Regulation S-K and related instructions thereto), except for material weaknesses in the Company's internal control over financial reporting related to controls environment, revenue recognition, manufacturing inventory, and warrants agreements as disclosed in Item 9A, *Controls and Procedures* of the Company Annual Report on Form 10-K for the years ended March 31, 2025 and 2024. The Audit Committee discussed the subject matter of each of these reportable events with Grant Thornton, and the Company authorized Grant Thornton to respond fully to the inquiries of the successor auditor concerning the subject matter of each of these reportable events.

In accordance with Item 304(a)(3) of Regulation S-K, the Company provided Grant Thornton with a copy of the disclosures it is making in this Current Report on Form 8-K and requested Grant Thornton furnish the Company with a letter addressed to the Securities and Exchange Commission stating whether Grant Thornton agrees with the statements made by the Company herein and, if not, stating the respects in which it does not agree. A copy of Grant Thornton's letter, dated October 6, 2025, is attached as Exhibit 16.1 to this Current Report on Form 8-K.

*Appointment of Independent Registered Public Accounting Firm*

As described above, the Audit Committee recently completed a competitive process to select an audit firm to serve as the Company's independent registered public accounting firm for the fiscal year ending March 31, 2026, and related interim periods. On September 30, 2025, the Company, at the recommendation of the Audit Committee, made the decision to select CohnReznick LLP ("CohnReznick") as auditors for the Company for the fiscal year ending March 31, 2026, contingent upon the execution of an engagement letter following completion of CohnReznick's standard client acceptance procedures.

During the fiscal years ended March 31, 2025 and 2024, and the subsequent interim period through the date of this Current Report on Form 8-K, neither the Company, nor anyone acting on its behalf, consulted CohnReznick regarding either (i) the application of accounting principles to a specified transaction, either completed or proposed, or the type of audit opinion that might be rendered with respect to the Company's consolidated financial statements, and neither a written report nor oral advice was provided to the Company by CohnReznick that CohnReznick concluded was an important factor considered by the Company in reaching a decision as to any accounting, auditing or financial reporting issue; or (ii) any matter that was the subject of a disagreement within the meaning of Item 304(a)(1)(iv) of Regulation S-K or a reportable event within the meaning of Item 304(a)(1)(v) of Regulation S-K.

------

**Item 9.01 &nbsp;&nbsp;&nbsp;&nbsp;Financial Statements and Exhibits.** 

(d) Exhibits

---

| | |
|:---|:---|
| **<u>Exhibit No.</u>** | **<u>Description</u>** |
| 16.1 | <u>[Letter from Grant Thornton LLP dated](exhibit161.htm)</u><u>[October 6, 2025.](exhibit161.htm)</u> |
| 104 | Cover Page Interactive Data File (embedded within the Inline XBRL document). |

---

------

**SIGNATURE**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

---

| | |
|:---|:---|
| | **Quantum Corporation** |
| | (Registrant) |
| October 6, 2025 | /s/ Laura A. Nash |
| (Date) | Laura A. Nash |
| | Chief Accounting Officer |

---

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;

&nbsp;&nbsp;&nbsp;&nbsp;

## Exhibit 16.1

**Exhibit 16.1**

October 6, 2025 U.S. Securities and Exchange CommissionOffice of the Chief Accountant100 F Street, NEWashington, DC 20549

Re: Quantum Corporation

File No. 001-13449

Dear Sir or Madam:

We have read Item 4.01 of Form 8-K of Quantum Corporation dated October 6, 2025, and agree with the statements concerning our Firm contained therein.

Very truly yours,

/s/ GRANT THORNTON LLP

<br>