Kerr Neilson called time on 28 years at Platinum Asset Management on Wednesday after he formally resigned from the board of the asset manager he co-founded with chief executive Andrew Clifford in 1994.

At Platinum’s annual general meeting in Sydney, the 72-year-old investor said he planned to actively manage his own portfolio in retirement as an “addicted stockpicker” who had the sharemarket “hard-wired into his whole approach to living”.