京王電鉄株式会社Data breach / unauthorized access incident
- Occurred on
- September 26, 2026
- Announced on
- September 26, 2026
- Severity
- BIncidents centered on names and contact details.
- Scale
- Unknown
- Main impact
- A ransomware attack has disrupted business systems at some group companies. Train operations are reported to be unaffected at this time, and no data leakage has been confirmed, but an investigation is ongoing.
- Information involved
- Not specified in the disclosure
- Cause / key point
- A ransomware attack on servers.About Ransomware
- Industry
- Transport & travel
- Listing / capital
- Listed company東証プライム 9008(京王電鉄)
- Sources
- Last updated
- October 20, 2026
Stock price reaction to the disclosure京王電鉄 / 東証プライム 9008
Stock information is reference data based on Yahoo Finance and may be delayed. This site does not solicit or advise investment and does not guarantee the accuracy or completeness of this information. We accept no liability for any investment decision based on it.
Is this incident worth paying attention to?
Written & reviewed
Reviewed byYutaro SasaoFounder & CEO, MediaLeap Inc.
CEO of MediaLeap Inc. Working on both sides of web advertising and web media since 2013; founded the company in May 2025.
Review scope: cross-checking against primary sources (official and government announcements), verifying claims stay within the facts, and checking source attribution。Last reviewed:
Written by:Leak Watch editorial team (AI-assisted drafts verified against sources by the editorial team) · Reviewer profile · Request a correction
Related incidents
Browse the database →Incidents sharing the same company, service, attack method or industry (grouped automatically from the disclosures).
Same attack method
- SSライドオンエクスプレス（『銀のさら・釜寅・すし上等』公式サイト・公式アプリ）2026.10.13 announced・Affected 6,500,000 records
- Sアフラック生命保険2026.06.30 announced・Affected 4,400,000 people
- Sアサヒグループホールディングス2026.07.17 announced・Affected 1,525,000 records
- BCKCネットワーク株式会社、株式会社学参2026.06.10 announced・Affected 664,000 records
- Aイズミ（ゆめオンライン・ゆめデリバリー）2026.10.14 announced・Affected 400,000 records
- Aエネサンスグループ2026.05.11 announced・Affected 365,000 records
Same industry
- SSSアドベンチャー（スカイチケット）2026.10.10 announced・Affected 14,640,000 records
- SSタイムズカー(タイムズモビリティ)2026.09.25 announced・Affected 6,600,000 accounts
- S日水物流(ニッスイグループ)2026.10.07 announced・Affected Unknown
- Sあいの風とやま鉄道株式会社2026.09.15 announced・Affected 1,409 people
- S西武鉄道（52席の至福）2026.09.02 announced・Affected 500 people
- Aエイチ・アイ・エス(HIS タイ現地法人)2026.10.07 announced・Affected 627 people
Attack method classification: Ransomware(Encrypting data and demanding a ransom)
Read the Ransomware guide and national trends →