The cut-off date is January 31 and July 31 of each year, i.e. For semi-annual review of indices, average data for six months ending the cut-off date is considered. Four weeks prior notice is given to market from the date of change. Index Governance: A professional team manages all NSE indices. There is a three-tier governance structure comprising the Board of Directors of NSE Indices Limited, the Index Advisory Committee (Equity) and the Index Maintenance Sub-Committee. References See also NIFTY 50 BSE SENSEX S&P Dow Jones Indices Year of establishment missing National Stock Exchange of India Indian stock market indices