21 organisations in Japan have been listed on ransomware group leak sites, tracked by Binary Response.
| Organisation | Group | Sector | Date |
|---|---|---|---|
| GCA Group | thegentlemen | 04 Apr 2026 | |
| whiskey.co.jp | krybit | 03 Apr 2026 | |
| Nippon Medical School Musashi Kosugi Hospital | netrunner | 03 Apr 2026 | |
| Shiraume Hospital | netrunner | 03 Apr 2026 | |
| Nissan | everest | 01 Apr 2026 | |
| Omikenshi | thegentlemen | 23 Mar 2026 | |
| Nafco | akira | 23 Mar 2026 | |
| MEDICUS SHUPPAN | thegentlemen | 21 Mar 2026 | |
| OTNet | nightspire | 21 Mar 2026 | |
| sopower.com | dragonforce | 20 Mar 2026 | |
| TSN Co., Ltd. | worldleaks | 20 Mar 2026 | |
| Chase Asia | thegentlemen | 16 Mar 2026 | |
| Donjon | akira | 05 Mar 2026 | |
| CERUMO Co., Ltd | nightspire | 05 Feb 2026 | |
| YOKOSUKA GAKUIN | Rhysida | Education | 15 Dec 2025 |
| Promotion Management Center | AiLock | 14 Oct 2025 | |
| Furuno Electric | Rhysida | Technology | 13 Oct 2025 |
| Toppan Next | Akira | Technology | 18 Apr 2025 |
| Microworks | Rhysida | Not Found | 15 Oct 2024 |
| Casio Computer Co., Ltd | Underground | Technology | 09 Oct 2024 |
| jaxa.jp | ALP-001 | 29 Nov 2023 |