Bloomberg reports that Martin-Artajo, who oversaw synthetic credit trading at the bank’s chief investment office in London, filed the case against the U.K. Financial Conduct Authority at a tribunal last week, according to the court’s website. No other details about the claim were available.
He was indicted in Manhattan federal court in September for allegedly helping to hide losses caused by Bruno Iksil, the Frenchman who became known as the London Whale. The U.S. Securities and Exchange Commission said in a parallel lawsuit that Martin-Artajo and Julien Grout, a trader who worked for him, engaged in a scheme to enhance the portfolio’s apparent performance and thereby curry favor with their supervisors.
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