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Frequently Asked Questions...

How the lot size and the lot price is decided in the future trading in stock market?

There is different lot size for the different company and also the margin require to buy a lot. How it is calculated?

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Selection Criteria
Eligibility Criteria for selection of Securities and Indices

The eligibility of a stock / index for trading in Derivatives segment is based upon the criteria laid down by SEBI through various circulars issued from time to time. The latest circular issued in this respect is circular No. : SEBI/DNPD/Cir-31/2006 dated September 22, 2006.

Based on various circulars, the following criteria will be adopted by the Exchange w.e.f September 22, 2006, for selecting stocks and indices on which Futures & Options contracts would be introduced.

1. Eligibility criteria of stocks

* The stock shall be chosen from amongst the top 500 stocks in terms of average daily market capitalisation and average daily traded value in the previous six months on a rolling basis.

* The stock’s median quarter-sigma order size over the last six months shall be not less than Rs. 0.10 million (Rs. 1 lac). For this purpose, a stock’s quarter-sigma order size shall mean the order size (in value terms) required to cause a change in the stock price equal to one-quarter of a standard deviation.

* The market wide position limit in the stock shall not be less than Rs. 500 million (Rs. 50 crores). The market wide position limit (number of shares) shall be valued taking the closing prices of stocks in the underlying cash market on the date of expiry of contract in the month. The market wide position limit of open position (in terms of the number of underlying stock) on futures and option contracts on a particular underlying stock shall be 20% of the number of shares held by non-promoters in the relevant underlying security i.e. free-float holding.

2. Continued Eligibility

* For an existing stock to become ineligible, the criteria for market wide position limit shall be relaxed upto 10% of the criteria applicable for the stock to become eligible for derivatives trading. To be dropped out of Derivatives segment, the stock will have to fail the relaxed criteria for 3 consecutive months.

* If an existing security fails to meet the eligibility criteria for three months consecutively, then no fresh month contract shall be issued on that security.

* Further, the members may also refer to circular no. NSCC/F&O/C&S/365 dated August 26, 2004, issued by NSCCL regarding Market Wide Position Limit, wherein it is clarified that a stock which has remained subject to a ban on new position for a significant part of the month consistently for three months, shall be phased out from trading in the F&O segment.

However, the existing unexpired contracts may be permitted to trade till expiry and new strikes may also be introduced in the existing contract months.

3. Re-introduction of dropped stocks

A stock which is dropped from derivatives trading may become eligible once again. In such instances, the stock is required to fulfill the eligibility criteria for three consecutive months to be re-introduced for derivatives trading.

4. Eligibility criteria of Indices

* Futures & Options contracts on an index can be introduced only if 80% of the index constituents are individually eligible for derivatives trading. However, no single ineligible stock in the index shall have a weightage of more than 5% in the index. The index on which futures and options contracts are permitted shall be required to comply with the eligibility criteria on a continuous basis.

* SEBI has subsequently modified the above criteria, vide its clarification issued to the Exchange “The Exchange may consider introducing derivative contracts on an index if the stocks contributing to 80% weightage of the index are individually eligible for derivative trading. However, no single ineligible stocks in the index shall have a weightage of more than 5% in the index.”

* The above criteria is applied every month, if the index fails to meet the eligibility criteria for three months consecutively, then no fresh month contract shall be issued on that index, However, the existing unexpired contacts shall be permitted to trade till expiry and new strikes may also be introduced in the existing contracts.

The following procedure is adopted for calculating the Quarter Sigma Order Size :

1. The applicable VAR (Value at Risk) is calculated for each security based on the J.R. Varma Committee guidelines. (The formula suggested by J. R. Varma for computation of VAR for margin calculation is statistically known as ‘Exponentially weighted moving average (EWMA)’ method. In comparison to the traditional method, EWMA has the advantage of giving more weight to the recent price movements and less weight to the historical price movements.)

2. Such computed VAR is a value (like 0.03), which is also called standard deviation or Sigma. (The meaning of this figure is that the security has the probability to move 3% to the lower side or 3% to the upper