The chief financial officer of Independent News and Media is to leave the company by mutual consent at the end of January 2019.
The media group confirmed Ryan Preston's departure in a statement to the stock exchange this afternoon.
"On behalf of the Board of INM and the Company I would like to thank Ryan for his contribution to the Company over the last four years," INM chief executive Michael Doorly said in the statement.
"We wish him every success in his future career."
The firm said it was engaged in a process of appointing a successor and would announce the chosen candidate in due course.
Mr Preston has worked at INM since 2014.
Between 2016 and 2017 he and former executive Robert Pitt made separate protected disclosures in relation to matters at INM, including a proposed takeover of radio station Newstalk.
This led to the Office of the Director of Corporate Enforcement launching an investigation into the company, which ultimately revealed a data breach involving some journalists' emails.
Mr Pitt left INM in October 2017.