Subcontractors stopped working on Dawnus sites this week and staff at the Swansea headquarters were given the bad news yesterday.
The Enquirer has been contacted by a string of subcontractors owed cash by Dawnus.
Dawnus hit the headlines on Tuesday when a subcontractor blocked a Manchester road following a pay row with them.
Documents seen by the Enquirer show Dawnus Construction Holdings filed a notice to appoint an administrator on Tuesday.
Latest accounts for Dawnus Construction Holdings for 2017 show the firm made a pre-tax loss of £1.7m from turnover of £118.5m and employed 269 people.