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Occurring Fact4784GMO internet,Inc.Information and Communications, Services and Others

Notice Regarding Our Policy for Responding to Unauthorized Access to Services We Provide

In connection with the unauthorized access to “Onamae.com Desktop Cloud,” we have decided to provide special support payments and assistance to customers whose information has been confirmed to have been disclosed, not comply with the attackers’ demands, and establish a reward for information. The scope of the damage and the total amount of compensation have not yet been determined.

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Policy for responding to unauthorized access involving services we provide

Subject Entity

GMO Internet, Inc. and its parent company, GMO Internet Group, Inc.

Target Locations / Products

Onamae.com Desktop Cloud service

OccurrenceFrom 21 October 2026 onward (date of the first report). The specific date of the unauthorized access itself is Not disclosed in this document
This disclosure10/28/2026
Cause

Unauthorized access by a third party. The detailed cause of the intrusion is Not disclosed

Related procedures

Type

Consultation with the police and other relevant authorities, and preparation for legal action

Court or authority

Police and other relevant authorities

Amount of Impact on Business Performance

The total amount associated with the response cannot currently be determined. GMO special support payments are capped at ¥3 million per disclosure, and the reward is capped at US$1 million in total

Company response

Investigation structure

The white-hat team of GMO Internet Group, Inc. continues to investigate and analyze customers’ devices

Outlook

We will provide updates on our website and elsewhere as information becomes available, and will promptly disclose any newly identified facts requiring disclosure. We will proceed with the investigation and analysis of devices, coordination with the police and other relevant authorities, and special support payments and assistance.

Planned follow-up disclosure

We will provide updates as information becomes available and promptly provide an update once the amount can be determined.

Event that occurred
ItemDetails
Event namePolicy for responding to unauthorized access involving services we provide
Date of occurrenceFrom 21 October 2026 onward (date of the first report). The specific date of the unauthorized access itself is Not disclosed in this document
Subject EntityGMO Internet, Inc. and its parent company, GMO Internet Group, Inc.
Target Locations / ProductsOnamae.com Desktop Cloud service
CauseUnauthorized access by a third party. The detailed cause of the intrusion is Not disclosed
Amount of Impact on Business PerformanceThe total amount associated with the response cannot currently be determined. GMO special support payments are capped at ¥3 million per disclosure, and the reward is capped at US$1 million in total
Type of litigation or proceedingConsultation with the police and other relevant authorities, and preparation for legal action
Court or authorityPolice and other relevant authorities
Investigation structureThe white-hat team of GMO Internet Group, Inc. continues to investigate and analyze customers’ devices
OutlookWe will provide updates on our website and elsewhere as information becomes available, and will promptly disclose any newly identified facts requiring disclosure. We will proceed with the investigation and analysis of devices, coordination with the police and other relevant authorities, and special support payments and assistance.
Planned follow-up disclosureWe will provide updates as information becomes available and promptly provide an update once the amount can be determined.
Items this document does not state (14)
Date recognized / date notice receivedAccounting period in which recognizedImpact on Earnings ForecastPlaintiffDefendantDate of filing / date of actionClaim amount / surcharge amountAmount of receivables at risk of non-collection or delayed collectionSuspended operationsScheduled resumption dateMeasures to prevent recurrenceDirectors' and officers' liabilityVoting rights ownership percentage before the changeVoting rights ownership percentage after the change

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 total amount associated with the response cannot yet be determined because the number of affected customers, the scope of the disclosed information, and the transactions eligible for compensation have not been confirmed. The decision not to comply with the attackers’ demands reflects the fact that compliance would not guarantee the deletion of the information or prevent its misuse, as well as our social responsibility not to encourage criminal activity.

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Notice Regarding Our Policy for Responding to Unauthorized Access to Services We Provide | GMO internet,Inc. (4784) timely disclosure | Komori