The London-listed investment company saw investment in the strategy rise from £7m to £17m.
With this new investment, the fund's portfolio now has exposure to 19 underlying funds managed by 10 general partners.
The London firm has bought another stake in Hutton Collins Capital Partners III, which has investments in Byron Burgers, Wagamama and Caffè Nero.
The French mezzanine debt firm increases its exposure to corporate debt through two Nordic stake purchases.
While fewer secondaries funds were being raised in the first quarter, the number of mezzanine and debt funds seeking capital has increased hugely in the past year, according to data released by PEI's Research and Analytics division.