TOPPAN / Sompo Japan
1MinorNo leakAnnounced
A mistaken operation sent kana names and policy numbers of 177,426 people (possibly duplicated) to another insurer. Complete deletion by the recipient was confirmed; no emails, addresses or accounts were included.
This incident was imported from a dataset that compiles public announcements, and we are still checking it against the sources. Counts and causes will be updated after the check. Sources are in Japanese.
- Cause
- Sent to the wrong person
- Occurred
- 2026-09-01
- Sector
- Finance & insurance
- Operational impact
- None
Data involved
| Data | Status | Count | Group | Evidence |
|---|---|---|---|---|
| Name | No leak found | 177,426 people | — | Source(opens in a new tab) |
Counts are the figures the organization announced. Because the same person may be counted more than once, we do not add the rows together.
What users should do
- Watch for emails and texts pretending to be the company
General steps based on the type of data involved. Check the organization’s notice or help line to see whether you are affected.