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Sensitive index

25 April 2010

what is the basis of forming an index. Like if i wish to establish a stock exchange what rationale should be considered to form an index.please tell me in detail

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3 Replies

CA Himanshu Bansal (Risk Manager) (2345 Points)
Replied 25 April 2010

Hi,

Scrip selection criteria :

The general guidelines for selection of constituents in SENSEX are as follows:

Listed History:The scrip should have a listing history of at least 3 months at BSE. Exception may be considered if full market capitalisation of a newly listed company ranks among top 10 in the list of BSE universe. In case, a company is listed on account of merger/ demerger/ amalgamation, minimum listing history would not be required.

Trading Frequency:The scrip should have been traded on each and every trading day in the last three months. Exceptions can be made for extreme reasons like scrip suspension etc.

Final Rank:The scrip should figure in the top 100 companies listed by final rank. The final rank is arrived at by assigning 75% weightage to the rank on the basis of three-month average full market capitalisation and 25% weightage to the liquidity rank based on three-month average daily turnover & three-month average impact cost.

Market Capitalization Weightage:The weightage of each scrip in SENSEX based on three-month average free-float market capitalisation should be at least 0.5% of the Index.

Industry Representation:Scrip selection would generally take into account a balanced representation of the listed companies in the universe of BSE.

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

Source: BSE

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CA Himanshu Bansal (Risk Manager) (2345 Points)
Replied 25 April 2010

Scrip selection criteria :

The constituents and the criteria for the selection judge the effectiveness of the index. Selection of the index set is based on the following criteria:

Liquidity (Impact Cost)

For inclusion in the index, the security should have traded at an average impact cost of 0.50% or less during the last six months for 90% of the observations for a basket size of Rs. 2 Crores.

Impact cost is cost of executing a transaction in a security in proportion to the weightage of its market capitalisation as against the index market capitalisation at any point of time. This is the percentage mark up suffered while buying / selling the desired quantity of a security compared to its ideal price (best buy + best sell) / 2

Floating Stock

Companies eligible for inclusion in S&P CNX Nifty should have atleast 10% floating stock. For this purpose, floating stock shall mean stocks which are not held by the promoters and associated entities (where identifiable) of such companies.

Others

a) A company which comes out with a IPO will be eligible for inclusion in the index, if it fulfills the normal eligiblity criteria for the index like impact cost, market capitalisation and floating stock, for a 3 month period instead of a 6 month period.

b) Replacement of Stock from the Index:

A stock may be replaced from an index for the following reasons:

i. Compulsory changes like corporate actions, delisting etc. In such a scenario, the stock having largest market capitalization and satisfying other requirements related to liquidity, turnover and free float will be considered for inclusion.

ii. When a better candidate is available in the replacement pool, which can replace the index stock i.e. the stock with the highest market capitalization in the replacement pool has at least twice the market capitalization of the index stock with the lowest market capitalization.

With respect to (2) above, a maximum of 10% of the index size (number of stocks in the index) may be changed in a calendar year. Changes carried out for (2) above are irrespective of changes, if any, carried out for (1) above.

Source: NSE