Irish Cement has confirmed that the Competition and Consumer Protection Commission carried out an inspection on May 14 at the company's plant in Platin, Co Meath.
The competition investigation was looking for evidence that the CRH subsidiary is abusing a dominant position in the bagged cement market.
Irish Cement is one of the largest players in the Irish market and is part of Ireland's biggest company, CRH, which has operations in Europe, the US and Asia.
In a statement today, Irish Cement said it fully facilitated the inspection and is continuing to co-operate with CCPC.
It added that inspections regarding competition policies, procedures and practices are an accepted part of the business environment around the world.
"Irish Cement operates to the highest business standards across all elements of its operations and is confident that it has no issue in relation to competitive practice," the company added.