Overview
“About 20,000” plus a 152-record subset → not summed; count blank. No bank/card data.
Timeline
- Occurred
- Discovered
- Disclosed
Organization response
Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.
What you can do
Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.
Sources
- お客さま情報が入った業務用パソコンの紛失について東京ガスネットワーク株式会社 · 2026-11-09