Daiwa says vendor hack may expose data of 110,000 clients

Investing.com·5 Oct 2026·

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Summary · why it matters

Daiwa Securities said on Monday that information on as many as 110,000 clients may have been leaked following unauthorized access to servers operated by an external vendor. The Japanese brokerage disclosed that Scala Communications had found evidence of unauthorized access and a possible data leak, and said the exposed information includes clients' names, email addresses and securities account numbers. The broader incident may involve about 220,000 records, including records that do not contain information identifying individuals. Daiwa said the leaked information cannot be used to access securities accounts or conduct online trading, that it has not detected any inappropriate transactions linked to the incident, and that its own systems were not breached, with the unauthorized access occurring at the external vendor's servers. Scala notified Daiwa after identifying evidence of the intrusion and has taken emergency security measures, while Daiwa is investigating the incident and assessing the extent of the information that may have been exposed. The incident adds to a growing series of cybersecurity breaches affecting Japanese companies, with Yamato Holdings and Sakura Internet also reporting unauthorized access involving customer information.

Daiwa Securities Group Inc. ▼