Travel software company Datalex has appointed Deloitte Ireland as its new auditor with immediate effect.
This comes after EY resigned as Datalex's auditors earlier this year.
In Datalex's annual report, published in September after months of delays, EY disclaimed an audit opinion - a highly unusual move for auditors.
It said this was due to a breakdown in controls last year that lead to an accounting scandal.
EY told the Registrar of Companies in September that it had formed the opinion that Datalex had failed to comply with its obligations under the Companies Act to keep adequate accounting records last year.
Datalex undertook an audit of its 2018 accounts after a review discovered "significant accounting irregularities" at the firm.
A PWC report said the company's figures for the first six months of 2018 were "materially overstated", with some revenue recorded before it had actually been received.
A delay to Datalex's publication of full year results led to the suspension of its Dublin-listed shares in April, while chairman Paschal Taggart and CEO Aidan Brogan also resigned.
Meanwhile, the company also said today that Roger Conan and Garry Lyons, non-executive directors, were stepping down from the board with effect from today.