rio tinto plc rio shares inched up 009 to £5343 thursday on what proved to be an allaround positive trading session for the stock market with the ftse 100 index ukx rising 034 to 762826 rio tinto plc closed £1063 short of its 52week high £6406 which the company achieved on january 26 trading volume 20 m remained 11 million below its 50day average volume of 31 m 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