The blacklock ransomware group listed MCM Construction on its data leak site on 2025-05-30. Country: US Sector: Manufacturing Domains named: mcmconstructioninc.com Claim as published on the leak site: Commercial & Residential Construction California, United States <25 Employees MCM Construction is a leading bridge construction company in the USA, known for building over 1000 critical structures across the West. Revenue $26.1 Million