Centrus Energy gains after appointing new CFO

** Shares of U.S.-based nuclear fuel supplier Centrus Energy LEU.A rise 2.8% to $242.70

** Company appoints Todd Tinelli as chief financial officer, effective August 11

** Tinelli replaces Kevin Harrill, who is resigning to pursue other opportunities after a four-year tenure as CFO and earlier as accounting chief

** Harrill will remain with the company through August 29

** Including session's moves, shares up 268.3% YTD