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Occurring Fact6941YAMAICHI ELECTRONICS CO.,LTD.Electrical Equipment and Precision Instruments

Update on the Ransomware Incident Affecting a Philippine Subsidiary of Our Group

Regarding the ransomware incident affecting some servers at a Philippine subsidiary, the affected systems returned to normal operation on 29 April. No impact on production or sales activities or information leakage has been identified at this time, but the details and cause of the incident and its impact on business performance remain under investigation.

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Ransomware incident at a Philippine subsidiary of Our Group

Subject Entity

Pricon Microelectronics, Inc. (Philippines)

Target Locations / Products

Some servers at Pricon Microelectronics, Inc.

This disclosure04/30/2026
Cause

Under investigation, Not disclosed

Company response

Scheduled resumption date

Normal operation resumed on 29 April 2026

Investigation structure

Working in cooperation with an external cybersecurity specialist. A forensic investigation is being conducted by an independent specialist

Impact on Earnings Forecast

The impact of this incident on the business performance of Our Group is currently being assessed in detail

Outlook

The details and cause of the incident will remain under investigation. If any matters requiring disclosure are identified, they will be disclosed promptly

Event that occurred
ItemDetails
Event nameRansomware incident at a Philippine subsidiary of Our Group
Subject EntityPricon Microelectronics, Inc. (Philippines)
Target Locations / ProductsSome servers at Pricon Microelectronics, Inc.
CauseUnder investigation, Not disclosed
Impact on Earnings ForecastThe impact of this incident on the business performance of Our Group is currently being assessed in detail
Scheduled resumption dateNormal operation resumed on 29 April 2026
Investigation structureWorking in cooperation with an external cybersecurity specialist. A forensic investigation is being conducted by an independent specialist
OutlookThe details and cause of the incident will remain under investigation. If any matters requiring disclosure are identified, they will be disclosed promptly
Planned follow-up disclosureIf any matters requiring disclosure are identified, they will be disclosed promptly
Items this document does not state (16)
Date of occurrenceDate recognized / date notice receivedAmount 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 operationsMeasures 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.

Recovery efforts were conducted in cooperation with an external cybersecurity specialist, and the affected systems have returned to normal operation. A forensic investigation by an independent specialist has found no evidence of information being taken outside the company or leaked, or of unauthorized data transfers or publication. The details and cause of the incident remain under investigation.

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Update on the Ransomware Incident Affecting a Philippine Subsidiary of Our Group | YAMAICHI ELECTRONICS CO.,LTD. (6941) timely disclosure | Komori