According to the industry regulator, a 64 year-old man has been detained by City of London Police Economic Crime Directorate.
The man has been arrested on suspicion of providing fake information and laundering money related to a case of possible insider trading.
In a statement, the FSA said: âFollowing questioning under caution by FSA staff, he was released on police bail pending further enquiries.
âFollowing the arrest a premises in Potters Bar was also searched as part of the investigation.â
The suspectâs detention follows the arrest of six other individuals made by investigators earlier in the year.
Meanwhile, Margaret Cole, head of enforcement at the FSA, was appointed to the regulatorâs board of directors.
Ms Cole has been responsible for leading the bodyâs crackdown on insider dealing through a managing a policy of âcredible deterrenceâ.
During 2009 the FSA made three criminal convictions and levied a total of Â£33.6 million worth of fines in relation to insider trading.
By Jim Ottewill