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Incidents attributed to:

Masaomi Matsuzaki (contractor system engineer)

Related incidents

Insider threatResolved

Benesse insider data breach

A contractor's system engineer copied 35 million customer records from Japanese education giant Benesse onto a personal device and sold them to data brokers — the largest insider data theft in Japanese history, triggering a ¥20 billion compensation programme.

Victim
Benesse Holdings
Loss
$190.0M
Records
35.0M