Chief Accounting Officer — Hiral A. Patel: The filing announces the external appointment of a new Chief Accounting Officer, which is a standard executive hire rather than a departure.

Chief Accounting Officer — Laura A. Nash: The Chief Accounting Officer is leaving the company after a transition period, but the filing explicitly states there are no disagreements and operations will not be disrupted.

Results of Financial Operations and Financial Condition. On August 10, 2026, Quantum Corporation (the “Company”) reported its financial results for the fiscal quarter ended June 30, 2026. A copy of the Company’s earnings release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liabili…

Results of Financial Operations and Financial Condition. On June 25, 2026, Quantum Corporation (the “Company”) reported its financial results for the fiscal quarter ended March 31, 2026. A copy of the Company’s earnings release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liabilit…

Termination of a Material Definitive Agreement. Termination of Credit Agreement With respect to that certain Term Loan Credit and Security Agreement (as amended, restated, supplemented or otherwise modified prior to the date hereof, the “Credit Agreement”), dated as of August 5, 2021, with the other loan parties party thereto, the lenders party thereto and Alter Domus (US) LLC, as disbursing agent and collateral agent, on June 4, 2026, Quantum Corporation (the “Company”) paid an aggregate of…

Other Events. On June 2, 2026, the Company issued a press release announcing the parties’ entry into the transactions described above. A copy of the press release is attached as Exhibit 99.2 to this Current Report on Form 8-K and incorporated by reference herein. Forward-Looking Statements This Current Report on Form 8-K and the exhibits hereto contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are those in…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth under

Unregistered Sales of Equity Securities. The disclosure set forth under

Entry into a Material Definitive Agreement. Private Placement Securities Purchase Agreement On June 1, 2026, Quantum Corporation (the “Company”) entered into Securities Purchase Agreements (the “Purchase Agreement”) with certain accredited investors (the “Investors”), pursuant to which the Company, in a private placement (the “Private Placement”), agreed to issue and sell to the Investors an aggregate of 10,615,712 shares of the Company’s common stock, par value $0.01 per share (“Common Stock…

of this Current Report on Form 8-K, including the preliminary financial results for the fiscal fourth quarter ended March 31, 2026 contained in Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liabilities of that Section. The information in this

Results of Financial Operations and Financial Condition. On February 17, 2026, Quantum Corporation (the “Company”) reported its financial results for the fiscal quarter ended December 31, 2025. A copy of the Company’s earnings release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the l…

Chief Financial Officer — William H. White: The company appointed William H. White as the new Chief Financial Officer.

Results of Financial Operations and Financial Condition. On January 15, 2026, Quantum Corporation (the “Company”) provided preliminary financial results for its fiscal third quarter ended December 31, 2025. A copy of the Company’s press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The information in this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934,…

Unregistered Sales of Equity Securities. The disclosure set forth under

Entry into a Material Definitive Agreement. As previously disclosed, on September 23, 2025, Quantum Corporation, a Delaware corporation (the “Company”), entered into a Transaction Agreement (the “Transaction Agreement”) with Dialectic Technology SPV LLC, a Delaware limited liability company (“Dialectic”), OC III LVS XXXIII LP, a Delaware limited partnership (“LVS XXXIII”), and OC III LVS XL LP, a Delaware limited partnership (“LVS XL” and together with LVS XXXIII, the “OC III Lenders”, and th…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth under

Results of Financial Operations and Financial Condition. On November 13, 2025, Quantum Corporation (the “Company”) reported its financial results for the fiscal quarter ended September 30, 2025. A copy of the Company’s earnings release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the…

of this Current Report on Form 8-K, including the preliminary financial results for the quarter ended September 30, 2025 contained in Exhibit 99.1, shall not be deemed to be filed for purposes of Section 18 of the Securities Exchange Act of 1934 (the “Exchange Act”), or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933 or the Exchange Act, except as shall be ex…

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 L…

Results of Financial Operations and Financial Condition. On September 10, 2025, Quantum Corporation (the “Company”) reported its financial results for the fiscal quarter ended June 30, 2025. A copy of the Company’s earnings release is furnished as Exhibit 99.1 to this report. The information in this Item 2.02, including Exhibit 99.1 hereto, is being furnished and shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liab…

Director — James C. Clancy, Tony J. Blevins: Two new directors were appointed to the Board of Directors.

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On August 21, 2025, Quantum Corporation (the “Company”) received a written notice (the “Notice”) from the Listing Qualifications staff of the Nasdaq Stock Market LLC (“Nasdaq”) stating that the Company is not in compliance with Nasdaq Listing Rule 5250(c)(1) as a result of the Company’s failure to timely file its Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2025 (the “Qu…

Termination of a Material Definitive Agreement. On August 13, 2025, Quantum Corporation (the “Company”) terminated the Amended and Restated Revolving Credit and Security Agreement, dated December 27, 2018 (as amended, modified, supplemented, renewed, restated or replaced from time to time prior to the date hereof, the “Revolving Credit Agreement”), by and among the Company, Quantum LTO Holdings, LLC, the other borrowers and guarantors from time to time party thereto, the lenders from time to…

Results of Operations and Financial Condition. The disclosure set forth in

Chief Financial Officer — Lewis W. Moorehead: Mr. Moorehead resigned as the Chief Financial Officer and Principal Financial Officer.