Nomura Investor Relations
Tokyo, Japan1 source
Reported:Reported by the press on 2 Nov 2026. The organisation has not confirmed it yet.
Nomura subsidiary breach exposes institutional investor information service data
Unauthorized users accessed an institutional investor information service run by Nomura Investor Relations and may have stolen names and email addresses.
- Type
- Data breach
- Sector
- Finance
- First reported
- 2 Nov 2026
- Latest source
- 2 Nov 2026
What to do
- If you have an account, change that password, and anywhere you reused it.
- Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
- Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
- If payment cards were involved, watch statements and ask your bank for a new card.
- If government ID or social security numbers were involved, consider a credit freeze.
- If this is a vendor of yours, ask what of your data they held and whether it was in scope.
- Reset any API keys, SSO trusts or shared credentials you have with them.
- Brief your help desk: attackers often impersonate the breached brand next.
Not sure? Ask an assistant with the sources attached, or have a coding agent check your systems.
Check your systems for Nomura Investor Relations
Sources
1Confidence 60% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.