The sinobi ransomware group listed Lanmark Group on its data leak site on 2025-12-16. Country: US Sector: Professional Services Domains named: www.lanmarkgroup.com Claim as published on the leak site: Lanmark Group, Inc. is a full-service general contracting firm based in Brooklyn, NY, founded in 2005. The company specializes in handling complex construction projects for both public and private sector clients, demonstrating a commitment to quality, safety, and client satisfaction. With a focus on meticulous planning and execution, Lanmark has established a strong reputation through their extensive portfolio of successful projects. Their expertise is showcased in multi-million dollar constructions, making them a trusted partner for state and municipal agencies.