Up to 200 jobs could be affected at trucking group Wettenhalls, with reports part of the organisation has gone into the administration.
The Transport Workers Union says its concerned about the future of workers employed by the company, based in Laverton North, in Melbourne's west.
The union says its inter-state freight division went into voluntary administration last night.
State Secretary Wayne Mader, says about 200 workers will be affected nationally, with half of those workers in Victoria.
"They're just in total shock I think and concerned about their entitlements," he said.
"We're just hopeful that the company and the administrator will ensure that all monies that are owed to employees for their entitlements and work done is going to be honoured." Wettenhalls has not returned calls from the ABC.