Cork accountancy business James O’Brien & Co has merged with Dublin firm Roberts Nathan in an arrangement that will see all senior staff at the business retained.

Post-merger, the Ballintemple-based firm will trade under the Roberts Nathan business name. Financial details of the agreement have not been disclosed but it is understood the restructured firm is expected to generate annual revenues of more than €6 million, employing 55 staff in Cork and Dublin. A spokeswoman for the business said all senior staff, including principal James O’Brien, will be retained in the merger.