X0202 SCHEDULE 13G 0000949509 XXXXXXXX LIVE Common Stock, $0.01 par value per share 06/30/2026 0000709283 Quantum Corporation 747906600 10770 E. Briarwood Avenue Centennial CO 80112 Rule 13d-1(b) Oaktree Capital Management LP DE 2011678 0 2011678 0 2011678 5.11 PN The reported percentage is calculated based on 39,374,500 shares of common stock ("Common Stock") outstanding as of June 24, 2026, as reported on the Issuer's 10-K filed with the Securities and Exchange Commission on June 25, 2026. Quantum Corporation 10770 E. Briarwood Avenue, Centennial, CO 80112 This Statement is filed by Oaktree Capital Management LP, referred to herein as the "Reporting Person." 333 S. Grand Ave., 28th Floor, Los Angeles, CA 90071 See response to row 4 on the cover page hereto. N IA See response to row 9 on the cover page hereto. The reported securities are directly held by the following funds and accounts, each managed by the Reporting Person: (i) Oaktree Value Opportunities Fund Holdings, L.P.; (ii) Oaktree London Liquid Value Opportunities Fund (VOF), L.P.; and (iii) Boston Patriot Arlington St LLC. The filing of this Statement shall not be deemed an admission of beneficial ownership by the Reporting Person for purposes of Section 13(d) or 13(g) or for any other purpose. See response to row 11 on the cover page hereto. See response to row 5 on the cover page hereto. See response to row 6 on the cover page hereto. See response to row 7 on the cover page hereto. See response to row 8 on the cover page hereto. Y Y Y Y Y N 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. Oaktree Capital Management LP /s/ Henry Orren 08/10/2026