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Nostrum
nostrum.co.jpNostrum was listed on the The Gentlemen leak site on Apr 27, 2026. Information as of Oct 19, 2026.
Country: JapanIndustry: Unknown
Updated continuously · figures as of Oct 19, 2026- Claimed by
- The Gentlemen
- First listed
- Apr 27, 2026
- Claims recorded
- 1
Leak-Site Claim.
The GentlemenConfirmed claim
- Posted on the leak site
- Apr 27, 2026
- Collected by Brandefense
- May 6, 2026
- Data claimed
- Not stated
nostrum.co.jp Nostrum Corporation, based in Japan, was founded in 1991 and specializes in smartphone app development, web system development, and website construction. The company is represented by Ryoichi Jono and is registered on the J-GoodTech platform as a verified Japanese technology business. One of their flagship self-developed products is a job aptitude test preparation tool, a simulation platform replicating real SPI, TG-WEB, and similar employment exam interfaces used by major Japanese companies
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Other Victims Of The Same Group.
| Victim | Claimed by | Country | Industry | Data claimed | Posted |
|---|---|---|---|---|---|
| AirQ airq-ad.com | The Gentlemen | AEUnited Arab Emirates | Transportation and Logistics | Not stated | |
| First Dental Health firstdentalhealth.com | The Gentlemen | USUnited States | Healthcare | Not stated | |
| Gio Dental Med Spa giodentalspa.com | The Gentlemen | MXMexico | Healthcare | Not stated | |
| Wellington College International School Bangkok wellingtoncollege.ac.th | The Gentlemen | THThailand | Education and Research | Not stated | |
| Ecuadors National Police policia.gob.ec | The Gentlemen | ECEcuador | Government and Public Sector | Not stated | |
| Santa Barbara Endodontics sbendo.com | The Gentlemen | USUnited States | Healthcare | Not stated |
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