Shares in Interbrew, the Belgian beer brewer which has launched its IPO on Euronext Brussels, held their own on the first day of trading in spite of investor concerns about a takeover investigation into the company.

Interbrew is being investigated under European anti-monopoly laws over its recent $3.3bn (€3.7bn) acquisition of Bass. It saw its shares debut at a slight premium to the issue price as they began trading on the Brussels segment of Euronext.