X0206 3 2022-04-22 0 0000709283 QUANTUM CORP /DE/ QMCO 0001163368 PACIFIC INVESTMENT MANAGEMENT CO LLC 650 NEWPORT CENTER DRIVE NEWPORT BEACH CA 92660 0 0 1 0 Common Stock 10248322 I See Footnote Warrant 1.33 2018-12-27 2028-12-27 Common Stock 4309464 I See Footnote Warrant 2.79 2020-06-16 2030-06-16 Common Stock 2215825 I See Footnote The securities reported in the tables above are held by certain funds and accounts for which the Reporting Person serves as investment manager, advisor or sub-advisor, including (i) OC II FIE V LP, which holds 2,980,860 shares of common stock, par value $0.01 per share (the "Common Stock") and warrants to purchase 6,525,289 shares of Common Stock and (ii) OC III LVS XL LP, which holds 7,267,462 shares of Common Stock. The Reporting Person disclaims beneficial ownership in the reported securities, except to the extent of its pecuniary interest therein. /s/ Jason Nagler 2022-04-25