Notice of System Disruption Caused by a Cyberattack (Update 4)
COTA CO.,LTD. (the filing company)
Some internal servers and internal PC terminals, and production, order acceptance and shipment operations for the company's products
Some servers and internal PC terminals were infected with ransomware through unauthorized access from outside the company, resulting in the encryption of data and other information
The company plans to record costs related to the response, but the amount is still under review. Accounting classification: Not disclosed
Fiscal year ending March 2026
There is currently no change to the earnings forecast for the fiscal year ending March 2026. The impact on financial performance is expected to be limited.
Company response
An investigation conducted in cooperation with external experts, including a forensic investigation
Restoration of the systems, including the rebuilding and strengthening of the network and server environments, and further strengthening of the security framework
The company will proceed with system restoration, including the rebuilding and strengthening of the network and server environments, as well as further strengthening of the security framework. If any matters requiring disclosure become clear, the company will disclose them promptly.
| Item | Details |
|---|---|
| Event name | Notice of System Disruption Caused by a Cyberattack (Update 4) |
| Date of occurrence | 27 March 2026 |
| Date recognized / date notice received | 27 March 2026 (the date on which the company confirmed malfunctions in some internal PC terminals and identified unauthorized access through an internal investigation) |
| Subject Entity | COTA CO.,LTD. (the filing company) |
| Target Locations / Products | Some internal servers and internal PC terminals, and production, order acceptance and shipment operations for the company's products |
| Cause | Some servers and internal PC terminals were infected with ransomware through unauthorized access from outside the company, resulting in the encryption of data and other information |
| Amount of Impact on Business Performance | The company plans to record costs related to the response, but the amount is still under review. Accounting classification: Not disclosed |
| Accounting period in which recognized | Fiscal year ending March 2026 |
| Impact on Earnings Forecast | There is currently no change to the earnings forecast for the fiscal year ending March 2026. The impact on financial performance is expected to be limited. |
| Investigation structure | An investigation conducted in cooperation with external experts, including a forensic investigation |
| Measures to prevent recurrence | Restoration of the systems, including the rebuilding and strengthening of the network and server environments, and further strengthening of the security framework |
| Outlook | The company will proceed with system restoration, including the rebuilding and strengthening of the network and server environments, as well as further strengthening of the security framework. If any matters requiring disclosure become clear, the company will disclose them promptly. |
| Planned follow-up disclosure | If any matters requiring disclosure become clear, the company will disclose them promptly. |
Items this document does not state (12)
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.Some servers and internal PC terminals were infected with ransomware through unauthorized access from outside the company, resulting in the encryption of data and other information.