Nikkei Business Daily reported a data breach at SMBC Nikko Securities (Japan) on 11 November 2026, and it has been confirmed. It affected 56,487 people.
People affected
56,487people
Reported
11 November 2026News report
What was exposed
Nobody has said yet what was exposed.
How it happened
How
Hacking Unauthorized access to employee stock ownership plan management systemsourceOur translation from Japanese従業員持ち株会管理システムへの不正アクセス
Confirmed by SMBC Nikko Securities: SMBC Nikko Securities announced on the 11th that unauthorized access to the employee stock ownership plan management system resulted in the leakage of personal information of up to 56,487 stock association membersOur translation from JapaneseSMBC日興証券は11日、従業員持ち株会管理システムへの不正アクセスで持ち株会会員の個人情報が最大5万6487人分漏洩したと発表した
News reports are read by an AI model; every fact taken from an article was checked word for word against it, and anything it could not find was dropped. · Corrections and changes
Questions about the SMBC Nikko Securities breach
Was SMBC Nikko Securities hacked?
Nikkei Business Daily reported a data breach at SMBC Nikko Securities (Japan) on 11 November 2026, and it has been confirmed. It affected 56,487 people. How it happened, by the sources: hacking.
What data was exposed in the SMBC Nikko Securities breach?
The notices and reports so far do not say what was exposed. This page is updated when they do.
How do I know if I was affected?
Organisations normally tell the people whose data was involved, by letter or email, and that notice says what of yours was in it. We cannot look up individual people. If you got a notice, check that it is real, then follow the steps on this page.
Is there a SMBC Nikko Securities data breach settlement?
No settlement open for claims is on record for SMBC Nikko Securities as of 15 November 2026. Every open settlement is listed with its deadline.
Is a letter, email or text about the SMBC Nikko Securities breach real or a scam?
A real notice names the breach, says what data was involved and never asks for a password, a code or a payment. Criminals often send fake notices after a breach is in the news. Do not use links or phone numbers in the message: go to SMBC Nikko Securities’s own site, or check the letter here.
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