The thegentlemen ransomware group listed Sielke on its data leak site on 2026-11-12. Country: DE Domains named: sielke.com Claim as published on the leak site: sielke.com Sielke is a German family company founded in 2002 in Hamburg, operating two brands: Sielke Papier for paper, packaging and office supplies, and Sielke Home for stylish home and living products. Headquartered at Dynamowerk 1 in Hamburg-Harburg, it has been serving businesses and consumers for 23 years. Sielke Papier provides a full range from printing and kraft paper to custom packaging solutions with sustainable FSC-certified options. Sielke Home offers decoration, kitchen, bath, well