Received margin shortfall email yesterday wherein the link SEBI's new rules for index derivatives: Here's what's changing – Z-Connect by Zerodha was mentioned for reference. I read the link and found
Additional margins on expiry day
Starting November 20, 2024, an Extreme Loss Margin (ELM) of 2% will be applied to short positions (selling options) on the expiry day to cover potential risks due to increased volatility.
Example: You have a short position in Nifty 25,000 call option expiring on 30th October with a margin requirement of Rs. 1 lakhs. On the expiry day of this option, you will have to maintain an additional 2%.
ELM is calculated on contract value (Strike price * Lot size). So you will need an additional margin of Rs. 12,500 (25000 Strike price * 25 Lot size * 2% / 100) on expiry day.
This does not in any way indicate hedging benefits are unavailable like in the case of calendar spreads. HOW WILL ELM ARISE SO LONG AS THERE IS A HEDGE? MARGIN SHORTFAL DUE TO ELM WILL COME INTO PLAY ONLY IF THE USER SQUARES OF THE LONG POSITION BEFORE EXITING THE SHORT POSITION. ARE THE BROKERS TRYING TO MISINTERPRET THIS TO GET HOLD OF MORE CASH THAN WHAT IS REQUIRED SO THAT CAN BE USED BY THEM FOR OTHER PURPOSES? OR IS THIS A WAY THE SEBI/EXCHANGES ARE COMPENSATING THE BROKERS FOR THE REPORTEDLY FALLEN ACTIVITY IN STOCK MARKET - PARTICULARLY IN THE DERIVATIVES SEGMENT?
This becomes more evident when you read the reasoning for denial of margin benefits on expiry days as mentioned below.
No calendar spread benefits on expiry day
Traders typically hold positions across different expiries (known as calendar spreads), this provides margin benefits and reduces the margin requirements.
On the expiry day of the F&O contracts, there’s a higher risk that the price of the contract expiring will behave very differently from contracts expiring at a later date. This is because of larger trading volumes on that particular day, which can lead to unpredictable price movements.
To manage this risk, SEBI has decided that traders will not get any margin benefits for calendar spreads on the day of expiry for contracts expiring on that day from February 10, 2025.
Example: Let’s say you have a short option expiring on 31st January with a margin of Rs. 1 lakh and a long option expiring on 28th February. Since your short position is hedged by the long one, you get a margin benefit and need only Rs. 50,000 instead of Rs. 1 lakh.
However, on 31st January (expiry day), this margin benefit will no longer be available, and you will have to maintain the full Rs. 1 lakh margin.