第一ライフグループ・第一生命（人事）Data breach / unauthorized access incident
- Occurred on
- Unconfirmed
- Announced on
- October 2, 2026
- Severity
- AFinancial and HR records — information that easily translates into monetary damage.
- Scale
- 120,000 people
- Main impact
- It has been announced that the names, addresses, job titles, supervisors' names, etc., of approximately 120,000 current and former employees may have been exposed.
- Information involved
- Home addressFull name
- Cause / key point
- Unauthorized access by a third party.
- Industry
- Finance & insurance
- Listing / capital
- UnlistedParent company.: 第一ライフグループ(東証プライム 8750)
第一生命 is a subsidiary of 第一ライフグループ.
- Last updated
- October 20, 2026
Stock price reaction to the disclosure第一ライフグループ・親会社 / 東証プライム 8750
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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
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Attack method classification: Unauthorized access (method undisclosed)(Breached, but the technique was not identified or disclosed)
Read the Unauthorized access (method undisclosed) guide and national trends →