Qatar's stock exchange plans to restructure its 20-share index by September to replace less active shares with more heavily traded ones, according to an announcement from the exchange. Qatar Gas Transport Company, United Development Company, National Leasing, Gulf Warehousing, Qatar Meat and Livestock Company, Dlala Brokerage and Salam International will be included in the new index. Ahli Bank, Doha Insurance, Qatar Insurance Company, Qatar National Cement Company, Qatar Flour Mills Company, Qatar Industrial Manufacturing Company and Qatar Electricity and Water Company will be dropped. The Doha Securities Market said the selection criteria was based on market capitalisation, volume of shares traded, turnover ratio and number of transactions.