The UK Financial Services Authority on Thursday said it charged former Mizuho investment banker Thomas Ammann and two associates for alleged insider dealing in the shares of Dutch company Oce NV, in its latest effort at cracking down on market abuse in the country.

The FSA said Ammann, aged 38, who worked for Mizuho until November 2010, had been charged with three counts of insider dealing. His lawyer wasn't immediately available to comment. Mizuho isn't implicated in the charges, which relate to personal trading by Ammann.