SEBI Stands Firm on Closing Auction Session, Signals Openness to Refinement

India’s capital markets oversight body has taken a definitive stance on its latest structural reform. The Securities and Exchange Board of India (SEBI) has confirmed that the newly introduced Closing Auction Session (CAS) mechanism is here to stay, ruling out any possibility of a rollback despite initial pushback and operational feedback from market participants.

Speaking on the sidelines of a cybersecurity conference at the National Institute of Securities Markets (NISM), SEBI Chairman Tuhin Kanta Pandey emphasized that while the core framework remains intact, the regulator is actively reviewing operational friction to refine the trading experience.

"The CAS is here to stay for sure; only we will see if there are certain constraints or certain issues that we can improve, certainly we will improve," Pandey told reporters.

Addressing Social Media Feedback & Market Friction

Rolled out on August 3, the CAS framework replaced the traditional Volume-Weighted Average Price (VWAP) calculation for stock closing prices with a discrete auction model. The shift triggered immediate reactions across online trading communities, with brokers and retail traders raising concerns regarding execution dynamic shifts during the final trading window.

Pandey acknowledged that SEBI’s internal teams are closely tracking feedback circulating on social media platforms. However, he stressed that policy decisions would be driven by deliberate analysis rather than immediate instinctive responses. SEBI technical teams are currently engaged in active discussions with industry participants to gather constructive inputs.

Transition Challenges vs. Global Standards

According to SEBI, part of the operational friction stems from market participants adjusting to the strategic shift away from legacy systems. Many institutions continue to rely heavily on execution strategies tailored for the old VWAP model, creating a temporary gap as firms transition toward auction-based execution.

Pandey highlighted that closing auction mechanisms are standard across major international exchanges, making India a relatively late adopter of the structural framework. He noted that resistance to change often accompanies long-standing procedural shifts:

"When you have something going on for years and years, they feel that change will never come. We do not put in energy into learning a new system," he remarked.

The Road Ahead

Despite initial friction, SEBI has also received positive feedback from institutional stakeholders welcoming the reform for its potential to improve end-of-day price discovery and curb closing-price distortion.

The regulator's stance signals a clear message to market participants: CAS is a permanent component of Indian market architecture, and future efforts will focus strictly on technical enhancements, liquidity deepening, and smoother implementation.