| | | | | |
| Name of Subsidiary | Jurisdiction of Incorporation or Organization |
| A.C.N. 120.786.012 Pty. Ltd. | Australia |
| Advanced Digital Information Corporation | United Stated |
| Certance (US) Holdings, Inc. | United Stated |
| Certance Holdings Corporation | United Stated |
| Certance LLC | United Stated |
| Diamond Corporation | France |
| LTO Holdings, LLC, a Delaware corporation | United Stated |
| Quantum Storage Technology Co., Ltd. | China |
| Quantum ADIC Korea Co., Ltd.. | Korea |
| Quantum Beteiligungs GmbH | Germany |
| Quantum Boehmenkirch GmbH & Co. KG | Germany |
| Quantum Engineering Australia Pty. Ltd. | Australia |
| QMCO Storage India Private Limited | India |
| Quantum International Inc., a Delaware corporation | United Stated |
| Quantum Peripherals (Europe) SARL | Switzerland |
| Quantum SARL | France |
| Quantum Storage Australia Pty. Ltd. | Australia |
| Quantum Storage GmbH | Switzerland |
| Quantum Storage Japan Corporation | Japan |
| Quantum Storage Singapore Pte. Ltd. | Singapore |
| Quantum Storage UK Ltd. | United Kingdom |
| Quantum Storage Mexico S. de R.L. de C.V. | Mexico |
| Quantum Corporation Turkiye Istanbul Liaison Office | Turkey |
| Quantum Government, Inc. | United States |
| Quantum International, Inc. | Malaysia |
| Quantum Storage Belgium B.V. | Belgium |
| Quantum Storage Italy S.R.L. | Italy |
| Quantum Storage Spain, S.L. | Spain |
| Quantum Storage UK, Canada Extra Provincial | United Kingdom |
| Quantum Storage Malaysia Sdn. Bhd. | Malaysia |
| Squarebox Systems Limited | United Kingdom |