In a brief statement, the FTSE 250-listed online financial trading firm said its senior independent director, Malcolm Le May will lead the search for Green’s successor.
Green commented: "With the completion of the CEO succession, this feels like a good moment to hand over the reins.”
“I look forward to watching the company grow and prosper under June Felix's leadership," he added.
On 30 October last year, IG appointed Felix as its new CEO with immediate effect, making her the firm’s first ever female chief.
Felix, whose appointment follows the departure of veteran Peter Hetherington last month, previously served as president of payment tech firm Verifone Inc’s (NYSE:PAY) Europe and Russia business. She has also previously held senior roles at Citibank and IBM.
Felix, who had been a non-executive director of IG since September 2015, was selected as CEO following an extensive succession planning process that assessed external and internal candidates, the group said.