What are the criteria for selection and review of scrips for the SENSEX? 

A. Quantitative Criteria: 

1. Market Capitalization:
The scrip should figure in the top 100 companies listed by market capitalization. Also market capitalization of each scrip should be more than 0.5 % of the total market capitalization of the Index i.e. the minimum weight should be 0.5 %. Since the SENSEX is a market capitalization weighted index, this is one of the primary criteria for scrip selection. (Market Capitalization would be averaged for last six months) 

2. Liquidity:
(i) Trading Frequency: The scrip should have been traded on each and every trading day for the last one year. Exceptions can be made for extreme reasons like scrip suspension etc. (ii) Number of Trades: Number of Trades: The scrip should be among the top 150 companies listed by average number of trades per day for the last one year. (iii) Value of Shares Traded: Value of Shares Traded: The scrip should be among the top 150 companies listed by average value of shares traded per day for the last one year. 

3. Continuity: 
Whenever the composition of the index is changed, the continuity of historical series of index values is re-established by correlating the value of the revised index to the old index (index before revision). The back calculation over the last one-year period is carried out and correlation of the revised index to the old index should not be less than 0.98. This ensures that the historical continuity of the index is maintained. 

4. Industry Representation: 
Scrip selection would take into account a balanced representation of the listed companies in the universe of BSE. The index companies should be leaders in their industry group. 

5. Listed History: 
The scrip should have a listing history of at least one year on BSE. 

B. Qualitative Criteria: 

Track Record: 
In the opinion of the Index Committee, the company should have an acceptable track record.

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