SEBI is reportedly preparing to suspend the use of the Closing Auction Session for derivatives settlement for one year. The move follows feedback after the system caused volatility on expiry days. While the auction mechanism remains for the cash market, the shift back to the previous settlement method has driven gains in exchange and brokerage stocks.
SEBI is reportedly moving to pause the use of the Closing Auction Session (CAS) for derivatives settlement, a decision expected to ease the volatility that has challenged traders and investors since the mechanism's launch in August 2026. According to market reports, the regulator is likely to revert to the previous Volume-Weighted Average Price (VWAP) methodology for derivatives contracts for at least one year.
The Closing Auction Session was introduced on August 3, 2026, with the aim of enhancing price discovery at the end of the trading day for F&O-eligible stocks. However, the system quickly became a point of contention. Market participants, including institutional and retail traders, reported significant and unpredictable price swings, particularly on days when monthly derivatives contracts expired. These sharp movements made it difficult for traders to manage positions efficiently, leading to widespread calls for a review of the new settlement rules.
The regulator’s pivot comes after a comprehensive consultation process. By the time the consultation paper concluded on October 3, 2026, SEBI had received a massive response of 20,000 public comments. This high level of engagement underscored the depth of frustration regarding the impact of the CAS on derivatives pricing. By choosing to pause the mechanism for this specific segment, the regulator is addressing the operational pressure faced by the market ecosystem.
Financial markets responded positively to the reports of this potential policy reversal on October 6, 2026. Shares of major stock exchanges, clearing corporations, and brokerage firms recorded gains of up to 4% during the trading session. Investors appear to be welcoming the prospect of returning to a more familiar and predictable settlement framework, which could reduce the operational uncertainty that defined the last two months of trading.
While the change is set to affect the derivatives segment, the Closing Auction Session will continue to function for the cash market. The regulator maintains that the auction process remains an effective tool for determining the fair closing price of underlying stocks. Consequently, the cash market will retain the CAS mechanism, while the derivatives segment will return to the older 30-minute VWAP method.
For investors and market participants, the next key update to track is the issuance of the formal circular from the exchanges confirming the timeline and technical details of this transition. While this regulatory adjustment is expected to stabilize settlement processes, the overall direction of the market will continue to be influenced by broader factors, such as foreign institutional investment flows, domestic macroeconomic data, and global sentiment.