Nucleus has stopped trading six Castlestone funds on the platform following an FSA visit to the asset management's premises this week.
On Wednesday, the FSA confirmed it had executed search warrants on the firm's premises in London and Chichester amid an ongoing regulatory investigation.
Following the visit, IFA-owned wrap Nucleus has closed six Castlestone funds on the platform to trading.
The funds are: Castlestone Aliquot Agriculture UCITS, Castlestone Aliquot Commodity UCITS, Castlestone Aliquot Commodity, Castlestone Aliquot Gold Bullion Income, Castlestone Global Property (DRE) and Castlestone Next 11 Emerging Markets I Acc.
This week, it also emerged Connor Noonan became the fourth member of staff to leave Castlestone since May.
Noonan was a commodities analyst working on the $34.7m Aliquot Commodity (UCITS) fund - one of three portfolios to have subscriptions suspended by the Central Bank of Ireland in May.
Yesterday, Castlestone Management released a statement saying it continues to operate as normal despite the FSA visit.
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