Detectives from the Garda National Economic Crime Bureau have arrested a man for insider trading contrary to the European Union (Market Abuse) Regulations 2016.
The investigation started after a report was given to the GNECB by the Central Bank.
The man is being detained in a south Dublin garda station.
In a statement, the GNECB said the extensive investigation had progressed with the assistance of personnel attached to the Central Bank.
"Their expertise and experience had been invaluable," the statement added.
