Midlands-based groundworks specialist PGC Contractors Ltd is in administration.
Insolvency specialist Ninos Koumettou of Alexander Lawson Jacobs was appointed administrator on 17 July.
PGC Contractors has been in operation for 18 years. According to its website, it was turning over £8-10m a year from 11 clients, including Vinci, Tolent, Kier, John Sisk and Thomas Vale.
It took on a wide range of groundworks projects, including retaining walls and flood defences, as well as reinforced concrete frames up to four storeys and bridge works.
Sister company Trafalgar Hire is believed to be unaffected.