rio tinto plc rio shares inched down 080 to £5612 friday on what proved to be an allaround dismal trading session for the stock market with the ftse 100 index ukx falling 127 to 733212 rio tinto plc closed £731 below its 52week high £6343 which the company achieved on march 3 editors note this story was autogenerated by automated insights an automation technology provider using data from dow jones and factset see our market data terms of use