SMBC Nikko Securities: intrusion into its employee stock ownership plan system; data on up to 56,487 members leaked

SMBC Nikko administers employee stock ownership plans for companies and provides the plans and their members with a management system. On 9 November it found unauthorized access to this system, cut access and stopped the service the same day. Its investigation then confirmed that member data of some plans leaked. [1]

Items that may be affected, varying by member: plan name, invested stock, member ID, name, address, dividends and taxes, holdings and the transfer bank account. Phone numbers and emails are not stored in the system. Up to 56,487 members are affected; no secondary harm has been confirmed. Resumption will be announced individually and on the website. [1]