The company said his decision to resign was based on his desire to pursue personal and other business interests.
Wigan became CFO of Sedgman back in March 2006, three months before the company’s debut on the Australian Securities Exchange.
“Alan has been an integral part of Sedgman’s transformation from a Brisbane-based business to an ASX 300 company with global operations,” Sedgman chief executive officer Mark Read said.
“I would like to thank Alan for his valuable contribution as CFO over the last four years and wish him every success in the future.”
Wigan’s resignation is effective November 5.
The coal handling and processing specialist will start up a selection process to find an experienced CFO.
Sedgman shares closed down 2.8%, or 5.5c, to $1.935 on Friday afternoon.