The funds, which soft-launched on 20 December, will not be available on platforms until they have built their track records and can only be invested in directly through Neptune.
The Monthly Income Fund will invest predominantly in UK equities with some overseas exposure and Geffen aims to achieve top quartile performance in terms of total return against the appropriate peer group, the company said.
As well as Geffen’s new mandate there has been another income fund launched, which is managed by George Boyd-Bowman and is global in scope.
Boyd-Bowman has been assistant manager on Neptune’s flagship £950.4m Income Fund, also run by Geffen, since December 2011.
Branching out from the income suite Neptune has given its head of emerging markets a Frontier Emerging Markets Fund to run, which will invest in Africa, South East Asia and Latin America.
The final new mandate to launch is the Russia Special Situations Fund, which will be managed by William Rice who joined Neptune in October 2010 as an investment analyst.
He has been assistant manager on the £360.4m Russia and Greater Russia Fund alongside Geffen and will branch out from the mainly large-cap focus this mandate has to look at both small- and mid-caps in his new fund.