The akira ransomware group listed Heierli on its data leak site on 2025-04-15. Country: CH Sector: Other Domains named: heierli.ch Claim as published on the leak site: The company's activities include project planning, construction m anagement, expertise and consulting in civil engineering and its specialized fields. We are ready to upload more than 92 GB of essential corporate doc uments such as: contact numbers and e-mail addresses of employees and customers, financial data (audits, payment details, reports) , corporate NDA’s, etc.