The investigation into Anglo Irish Bank has so far cost the Office of the Director of Corporate Enforcement €1m.
Director Paul Appleby said he hoped the investigation would be wrapped up ‘in a few months,’ but declined to give a specific date.
Between 16 and 18 people are working on the inquiry.
The probe is currently focusing on loans to directors at the bank, the ‘Golden Circle’ investors and the back-to-back loans of €7.45bn from Irish Life & Permanent.
Mr Appleby said ‘gardaí are very satisfied with progress and good progress has been made.’
He said his office would present the Director of Public Prosecutions with papers as soon as possible.
He added ‘my staff and I are well aware of the public's legitimate desire that these investigations should be concluded soon, and we are endeavouring to complete as quickly as is appropriate.’
