SE Holdings subsidiaries experience data breach via IIJ email service

SE Holdings And Incubations (TSE:9478) announced today that its subsidiaries, SE Mobile & Online and SE Investment, may have been affected by a security incident at their email service provider, Internet Initiative Japan (IIJ). According to the announcement, IIJ reported unauthorized access to its email servers on April 14, 2025. While the extent of the breach is currently under investigation, SE Holdings stated that IIJ has not yet provided specific details regarding potential email address or content leakage. The company assures that other subsidiaries and systems unrelated to the IIJ email service remain unaffected. SE Holdings has directed stakeholders to IIJ's press release for further details on the incident.