Komori
Occurring Fact157AGreen Monster Inc.Information and Communications, Services and Others

Initial Report on the Potential Leakage of User Information and Other Data from Our FX Navi App

It has come to light that a third party may have continuously obtained user information and other data from the FX demo-trading app "FX Navi" between 27 and 30 April 2026. Although no actual leakage has been confirmed at this time, approximately 6.19 million records may have been affected.

Worth reading
48Recurring
0–100. This measures how worthwhile something is to read, not how good or bad the company is.
Direction
Deterioration
Direction inferred from the company’s description.
Scale
6190000
Records (approximately 6.19 million records of user information and other data)
Wording
Avoiding a definitive answer
How definitive the wording is.

Potential Leakage of User Information and Other Data from Our "FX Navi" App

Subject Entity

Filing company: Green Monster Inc.

Target Locations / Products

FX demo-trading app "FX Navi"

OccurrenceFrom around 20:26 on 27 April 2026 to around 14:26 on 30 April 2026
173 days later
Awareness or receipt of notice17 October 2026 (the date on which the Company confirmed unauthorized access to the app by a third party)
This disclosure10/23/2026
Cause

A function of the app's API

Company response

Investigation structure

The Company is investigating the cause and scope of the impact with advice from external experts.

Measures to prevent recurrence

The Company will announce specific measures to prevent recurrence based on the findings of its investigation into this matter.

Impact on Earnings Forecast

The impact of this matter on the Company's financial results is currently under review. The Company will promptly disclose any matters that require disclosure.

Outlook

The Company will investigate the cause and scope of the impact with advice from external experts and will promptly announce any matters that require disclosure.

Planned follow-up disclosure

The Company will promptly announce any matters that require disclosure.

Event that occurred
ItemDetails
Event namePotential Leakage of User Information and Other Data from Our "FX Navi" App
Date of occurrenceFrom around 20:26 on 27 April 2026 to around 14:26 on 30 April 2026
Date recognized / date notice received17 October 2026 (the date on which the Company confirmed unauthorized access to the app by a third party)
Subject EntityFiling company: Green Monster Inc.
Target Locations / ProductsFX demo-trading app "FX Navi"
CauseA function of the app's API
Impact on Earnings ForecastThe impact of this matter on the Company's financial results is currently under review. The Company will promptly disclose any matters that require disclosure.
Investigation structureThe Company is investigating the cause and scope of the impact with advice from external experts.
Measures to prevent recurrenceThe Company will announce specific measures to prevent recurrence based on the findings of its investigation into this matter.
OutlookThe Company will investigate the cause and scope of the impact with advice from external experts and will promptly announce any matters that require disclosure.
Planned follow-up disclosureThe Company will promptly announce any matters that require disclosure.
Items this document does not state (14)
Amount of Impact on Business PerformanceAccounting period in which recognizedType of litigation or proceedingCourt or authorityPlaintiffDefendantDate of filing / date of actionClaim amount / surcharge amountAmount of receivables at risk of non-collection or delayed collectionSuspended operationsScheduled resumption dateDirectors' 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 Company explains that the cause enabling the third party to obtain user information and other data was a function of the app's API.

How to read this page

This is not the documentKomori reads the disclosure the company filed and writes this summary. Figures are as stated by the company and are not audited.
Weight is not a verdictIt measures how much this changes what the company had already told the market. It is not a view on the shares.
Corrections happenIf the company reissues this disclosure, the page is rebuilt from the corrected version and the revision number moves up.
Initial Report on the Potential Leakage of User Information and Other Data from Our FX Navi App | Green Monster Inc. (157A) timely disclosure | Komori