Attention, traders! SEBI introduces index-like rule for single-stock derivatives now

Capital market regulator SEBI on Thursday introduced a major change in the way single-stock derivative contracts -- futures and options (F&O) -- are treated on the expiry day, with effect from the next three months. It disallowed the benefit of offsetting positions across expiries on the day of expiry for single stock derivatives, aligning the calendar spread treatment with rules applicable to index derivatives. The decision, noted a SEBI circular, was based on references received from trading members with regard to possible risks emanating from the calendar spread benefit on expiry day for single stocks.

The regulator also stated that the existing margin calculations for calendar spread positions will continue to be unchanged for calendar spread positions involving all expiries other than the contracts expiring on a given day.

What is a calendar spread margin?

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A calendar spread margin is a lower margin requirement charged by bourses when a trader holds two opposite positions in the same contract but with different expiry dates -- typically buying a longer-term option or future and selling a shorter-term one at the same strike.

Because the positions hedge each other, the exchange allows a reduced margin compared to holding the positions separately.

What does this let traders do?

This strategy simply enables traders to benefit from the price difference -- known as spread in market parlance -- between the two contracts, while enjoying comparatively lower margin requirements due to its hedged structure.

When will the new rule take effect?

It will come into force the end of three months from the date of the circular, dated February 5.

Other key things to know

SEBI has ordered stock exchanges -- like NSE and BSE -- and clearing corporations -- CDSL and NSDL -- to take necessary steps to set up systems for implementation of this requirement.

This includes necessary amendments to the relevant regulations, if any, according to the circular.

What does this mean for traders? An example...

Let's say there are three monthly expiries available at a given time in the market on the following dates:

• 29th: current month
• 30th: next month
• 31st: far month

In this case, the calendar spread positions involving positions expiring on the 29th (current month) and 30th (next month), or the 29th (current month) and the 31st (far month), will not be provided calendar spread treatment on the 29th.

However, calendar spread positions involving positions expiring on the 30th (next month) and 31st (far month) will continue to receive calendar spread treatment on the 29th (current month expiry).

What is the advantage of this change?

The change ensures that calendar spread norms for single-stock derivatives are aligned with those already applicable to index derivatives. In turn, this creates consistency across the futures and options segment.

Exchanges give traders and brokers a clear visibility of margin requirements in advance by withdrawing the calendar spread margin benefit on the expiry day.

This then enables end clients and trading members adequate time on the expiry day to arrange additional margin or to proactively roll over or close their calendar spread positions instead of facing abrupt funding pressures.

Without such a rule, a key risk arises when one leg of the calendar spread expires. Once the expiring contract drops off, the remaining open position can suddenly attract a much higher margin requirement on the next trading day.

This sharp and unexpected jump in margin leaves brokers with limited options if clients fail to provide funds in time, especially if the open leg moves sharply against the position.

The revised framework reduces the risk of margin shocks, improves risk management for brokers, and strengthens overall market stability.