The FMA launched its probe when it received a number of complaints by Forestland investors about the group
"Intueri is very pleased that the SFO enquiry has been closed," chair Chris Kelly said.
"The Board and the Executive team past and present should be held accountable for these losses."
Paul O'Neil's departure comes as the FMA's focus shifts under the new Financial Markets Conduct Act.
"Something is wrong with the FMA. There is high staff turnover even at the lower rungs of the organisation"