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Listed on a ransomware leak site

Otto Sieve GmbH

otto-sieve.de

Otto Sieve GmbH was listed on the Storm leak site on Aug 24, 2026. Information as of Oct 19, 2026.

Country: GermanyIndustry: Manufacturing
Updated continuously · figures as of Oct 19, 2026
Claimed by
Storm
First listed
Aug 24, 2026
Claims recorded
1

Leak-Site Claim.

StormConfirmed claim
Posted on the leak site
Aug 24, 2026
Collected by Brandefense
Aug 27, 2026
Data claimed
Not stated

Posted again 1 time by the same group

Leak-site post text, written by the group
Otto Sieve GmbH is a family-owned German company specializing in building services and modern home technology. Founded in 1967, the company provides heating, ventilation, sanitary, solar, and renewable energy solutions. Its services cover the planning, installation, maintenance, repair, and modernization of heating systems, bathrooms, heat pumps, solar technology, ventilation, and related building systems. Otto Sieve serves customers involved in new construction, renovation, and modernization projects and also provides maintenance and emergency repair services. The company emphasizes…

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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.