The Financial Conduct Authority (FCA) and the Metropolitan Police this morning executed search warrants in West London.
Four individuals including three men aged 29, 51, and 56 and one women aged 25 have been arrested and are currently in custody to be questioned in connection with an investigation in to insider dealing and market abuse.
The FCA said no further details can be confirmed at this time and no individuals have been charged. The arrests are not linked to any other ongoing insider dealing investigation.
Insider dealing is a criminal offence punishable by a fine or up to 7 years imprisonment.