SEBI is set to change how expiring derivatives contracts are settled, using a 30-minute volume-weighted average price (VWAP) starting December 7, 2026. This adjustment aims to lower the high volatility seen during closing hours. Market watchers anticipate this will benefit brokerage firms by encouraging more consistent trading activity, while the impact on exchange earnings remains to be evaluated.
The Securities and Exchange Board of India (SEBI) has introduced a new framework for the Closing Auction Session, which will change how settlement prices are calculated for expiring derivative contracts. Starting December 7, 2026, the regulator will move to a volume-weighted average price (VWAP) method based on the final 30 minutes of continuous trading. The regulator introduced this change following feedback from market participants, who noted that the previous system often led to high price volatility at the end of the trading day.
Impact on Trading Mechanics
The previous method for closing auctions sometimes caused sharp price swings, which discouraged participation in futures and options. By shifting to a 30-minute VWAP, the regulator aims to create a more stable price discovery process. Alongside this, the operational timeline for the closing auction will be standardized. The auction session will run for 10 minutes, from 3:30 PM to 3:40 PM, on all active trading days. Derivatives contracts for both stocks and indices will continue to trade until 3:45 PM, with specific guidelines for the final day of the contract.
Brokerages vs. Exchanges
Analysts have highlighted that this shift could provide a tailwind for brokerage firms. These firms generally benefit when trading volumes are higher and more consistent. The expectation is that by reducing the artificial volatility of the closing auction, more participants may feel comfortable trading, which could help restore volumes that had previously dropped.
For exchange operators, the outcome is different. While a recovery in overall market activity is positive, the direct earnings impact for exchanges might be more limited. Earnings for exchanges do not always rise in direct proportion to an increase in trading turnover. The market will be watching to see if this change effectively brings back the trading interest that existed before the previous volatility issues arose.
What Investors Should Track
Investors and traders should monitor the implementation of these rules in December. The key metric to observe will be whether the new VWAP method successfully reduces the price spikes seen at the end of expiry days. Additionally, watching trading volume data in the weeks following the change will indicate if the new rules are helping to improve market participation. The shift is designed to streamline the closing process, and its success will depend on how market participants adjust their strategies to the new calculation method.