Periodical returns requirement: recognised stock exchanges must report specified market data to regulatory authority to ensure market transparency. Every recognised stock exchange shall furnish the Securities and Exchange Board of India periodical returns relating to official rates for securities, the number of shares delivered through the clearing house, making-up prices, clearing house programmes, the number of securities listed and de listed during the previous three months, the number of securities brought on or removed from the forward list during the previous three months, and any other matter as may be specified by the Securities and Exchange Board of India.