Regarding the leakage of customers' email addresses due to unauthorized access at an outsourced service provider
アララ株式会社 (the outsourced provider subject to unauthorized access), MATSUI SECURITIES CO.,LTD. (the company that outsourced the handling of customer email addresses)
アララ株式会社's email delivery service, email addresses belonging to customers of MATSUI SECURITIES CO.,LTD.
Unauthorized access by a third party
Company response
Suspension of use of アララ株式会社's email delivery service
We will request that アララ株式会社 investigate the facts and cause of the incident and implement measures to prevent recurrence, while further strengthening our management framework for outsourced providers.
The impact of this matter on our financial results is expected to be immaterial.
Related procedures
Relevant authorities (specific names are Not disclosed)
We will contact individually the customers whose information was leaked, request that アララ株式会社 investigate the facts and cause of the incident and implement measures to prevent recurrence, and strengthen our management framework for outsourced providers. If any new facts come to light, we will promptly provide notification.
| Item | Details |
|---|---|
| Event name | Regarding the leakage of customers' email addresses due to unauthorized access at an outsourced service provider |
| Date of occurrence | 5 November 2026 (the date on which we received a report from アララ株式会社; the actual date of the unauthorized access is Not disclosed) |
| Date recognized / date notice received | 5 November 2026 (the date on which we received a report from アララ株式会社) |
| Subject Entity | アララ株式会社 (the outsourced provider subject to unauthorized access), MATSUI SECURITIES CO.,LTD. (the company that outsourced the handling of customer email addresses) |
| Target Locations / Products | アララ株式会社's email delivery service, email addresses belonging to customers of MATSUI SECURITIES CO.,LTD. |
| Cause | Unauthorized access by a third party |
| Impact on Earnings Forecast | The impact of this matter on our financial results is expected to be immaterial. |
| Court or authority | Relevant authorities (specific names are Not disclosed) |
| Suspended operations | Suspension of use of アララ株式会社's email delivery service |
| Measures to prevent recurrence | We will request that アララ株式会社 investigate the facts and cause of the incident and implement measures to prevent recurrence, while further strengthening our management framework for outsourced providers. |
| Outlook | We will contact individually the customers whose information was leaked, request that アララ株式会社 investigate the facts and cause of the incident and implement measures to prevent recurrence, and strengthen our management framework for outsourced providers. If any new facts come to light, we will promptly provide notification. |
| Planned follow-up disclosure | If any new facts come to light, we will promptly provide notification. |
Items this document does not state (13)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.The service operated by アララ株式会社, the outsourced provider responsible for email delivery, was subject to unauthorized access by a third party.