The FSA has charged former Mizuho International investment banker Thomas Ammann and two associates with insider dealing.
Ammann has been charged with three counts of insider dealing and two counts of encouraging insider dealing.
Christina Weckwerth, who lives in Germany, has been charged with two counts of insider dealing and Jessica Mang has been charged with one count of insider dealing.
The regulator has also charged Ammann and Weckwerth with a single count of money laundering.
The offences relate to trading in shares of Dutch printing firm OcéNV between February and November 2009.
The charges follow on from the arrests of Ammann and Mang last November.
Mizuho International is the London-based securities and investment banking arm of the Mizuho Financial Group. The FSA has cleared Mizuho of any wrongdoing.
Weckwerth and Mang are not connected to the firm.
In a statement, Mizuho says: “The FSA has confirmed that there has been no wrongdoing by Mizuho International and no actions are being taken against Mizuho International.
“The FSA has not expressed any concern about Mizuho International or its systems and controls.
“The transactions to which the charges relate were executed by the individual in his personal capacity and were not done through or processed by Mizuho International.”
All three have been bailed to attend the City of Westminster magistrates court on August 23.
The FSA has pursued insider dealing cases more aggressively in recent years.
It has so far secured 10 convictions in relation to insider dealing and is currently prosecuting a further 13 individuals for insider dealing charges.