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Listed on a ransomware leak site

Seiko Group Corporation

seiko.co.jp

Seiko Group Corporation was listed on the ALPHV leak site on Aug 21, 2023. Information as of Oct 19, 2026.

Country: JapanIndustry: Media and Entertainment
Updated continuously · figures as of Oct 19, 2026
Claimed by
ALPHV
First listed
Aug 21, 2023
Claims recorded
1

Leak-Site Claim.

ALPHVConfirmed claim
Posted on the leak site
Aug 21, 2023
Collected by Brandefense
Jul 12, 2025
Data claimed
Not stated
Leak-site post text, written by the group
Seiko Group Corporation, commonly known as Seiko, is a Japanese maker of watches, clocks, electronic devices, semiconductors, jewelry, and optical products. This company has low security of its network and products. As a result it's network has been breached by ALPHV Ransomware Team and a lot of critical data was stolen from Seiko's network through this breach. Total volume of stolen data is 2,5TB. Downloaded data includes sensitive and confidential information about Seiko's business processes and products. Short list of downloaded data: - watch blueprints - new watch models development -…

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.