"The appointment takes effect immediately," the statement said. The 49-year-old Juniac served as chief of staff of IMF chief Christiane Lagarde when she served as France's finance minister.
He replaces Jean-Cyril Spinetta, who became interim CEO on October 17 when Pierre-Henri Gourgeon resigned. The 65-year-old Gourgeon had been appointed CEO on January 1 2009.
In July, company shareholders voted to reappoint Gourgeon for another four-year term, but later that month the group reported a first quarter net loss of 197 million euros ($283 million) and warned that outlook was uncertain for the rest of the year.
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