SEBI Revises Derivative Settlement Rules Effective December 7
The Securities and Exchange Board of India alters settlement methods for expiring derivatives to stabilize market volatility.
SEBI will revert to VWAP for settling expiring derivatives from December 7.
The revised auction session will run from 3:30 PM to 3:40 PM.
Concerns over volatility led to the review of the previous closing auction framework.
In a significant regulatory update, the Securities and Exchange Board of India (SEBI) has announced changes to the settlement process for expiring derivatives contracts, set to take effect on December 7. This decision follows heightened volatility in the stock market attributed to the newly introduced closing auction framework, which was implemented on August 3, 2026. The revised rules aim to restore stability by utilizing the volume-weighted average price (VWAP) of the underlying stocks during the last 30 minutes of trading for settlement purposes.
The changes come after a review conducted by SEBI on October 15, which assessed the effectiveness of the Closing Auction Session (CAS). Initially designed to enhance the discovery of closing prices in the cash market, the auction faced criticism for its impact on derivatives trading. The auction's limited participation raised concerns that the prices determined during this period could disproportionately affect traders, especially on expiry days when market activity peaks.
Under the new framework, the Closing Auction Session will now occur from 3:30 PM to 3:40 PM, while the settlement of expiring stock derivatives will revert to the VWAP calculated from continuous trading in the last half-hour. For index derivatives, the settlement will similarly rely on the VWAPs of constituent stocks during this timeframe. This adjustment aims to mitigate the risks associated with sharp price fluctuations observed during the auction, which previously saw significant swings, such as the Sensex's indicative value fluctuating by over 2,000 points.
Market experts, including Pranshu Chugh from Inquant Systematic Investment Managers LLP, have welcomed SEBI's decision, emphasizing the importance of separating cash-market closing price discovery from derivatives settlement. This separation is expected to reduce the influence of volatile auction prices on derivatives positions, providing a more stable trading environment. The decision reflects SEBI's responsiveness to market feedback and its commitment to regulatory pragmatism.
Looking ahead, traders can anticipate a return to a more predictable settlement process for expiring derivatives, with the focus shifting back to continuous trading prices rather than auction-derived values. As the market adapts to these changes, the implications for trading strategies and overall market stability will be closely monitored in the coming weeks.
