ASX chief financial officer (CFO) Ramy Aziz will leave the company in September 2018 after 18 years, including eight as CFO.
Mr Aziz was the group financial controller at SFE Corporation and continued in the role at ASX following the merger of the ASX and SFE in July 2006.
Before 2000, Mr Aziz was the CFO and company secretary of Austrapay. Before that, he held a number of positions at The Chase Manhattan Bank (now JP Morgan).
The ASX is currently conducting an executive recruitment process to appoint Mr Aziz's successor.
Commenting on Mr Aziz's departure, ASX chief executive Dominic Stevens said: "Ramy has made a very significant contribution to ASX over many years and has been an important member of my Executive team. I have valued his support, and the expertise and sound judgement that he has brought to his role as CFO."
"I look forward to continuing to work closely with Ramy over the coming months as we prepare to deliver ASX’s full-year results for 2018," Mr Stevens said.