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

Notice Regarding a Ransomware Incident at a Philippine Subsidiary of Our Group

The Company has confirmed that some servers at its Philippine subsidiary, Pricon Microelectronics, Inc., were affected by ransomware. The Company is currently working to protect and restore the affected systems and investigating the extent of the damage and its cause.

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Ransomware incident at a Philippine subsidiary of the Company's group

Subject Entity

Pricon Microelectronics, Inc. (Philippines)

Target Locations / Products

Some servers at Pricon Microelectronics, Inc. (Philippines)

Occurrence17 April 2026 (the date on which the Company confirmed the incident; the date on which the incident itself occurred is not disclosed)
Same day
Awareness or receipt of notice17 April 2026 (the date on which the Company confirmed the incident)
This disclosure04/22/2026
Impact on Earnings Forecast

The impact on financial results is currently under review. Whether the earnings forecasts will be revised and the revised figures are not disclosed.

Company response

Investigation structure

Working with external experts and others

Outlook

The Company will continue working to protect and restore the affected systems, while investigating the extent of the damage and its causes. The Company will promptly disclose any matters that should be disclosed once identified.

Event that occurred
ItemDetails
Event nameRansomware incident at a Philippine subsidiary of the Company's group
Date of occurrence17 April 2026 (the date on which the Company confirmed the incident; the date on which the incident itself occurred is not disclosed)
Date recognized / date notice received17 April 2026 (the date on which the Company confirmed the incident)
Subject EntityPricon Microelectronics, Inc. (Philippines)
Target Locations / ProductsSome servers at Pricon Microelectronics, Inc. (Philippines)
Impact on Earnings ForecastThe impact on financial results is currently under review. Whether the earnings forecasts will be revised and the revised figures are not disclosed.
Investigation structureWorking with external experts and others
OutlookThe Company will continue working to protect and restore the affected systems, while investigating the extent of the damage and its causes. The Company will promptly disclose any matters that should be disclosed once identified.
Planned follow-up disclosureThe Company will promptly disclose any matters that should be disclosed once identified.
Items this document does not state (16)
CauseAmount 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 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.

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Notice Regarding a Ransomware Incident at a Philippine Subsidiary of Our Group | YAMAICHI ELECTRONICS CO.,LTD. (6941) timely disclosure | Komori