SEBI Chairman Affirms Any Closing Auction Session Action Will Serve Larger Public Interest as Feedback Crosses 20,000 Comments

Securities and Exchange Board of India (SEBI) Chairman Tuhin Kanta Pandey has reiterated the capital market regulator’s commitment to investor protection, affirming that any regulatory measures taken regarding the Closing Auction Session (CAS) mechanism will strictly serve the larger public interest.

Speaking at the 12th International Convention of the Commodity & Capital Market Participants Association of India (CPAI) in New Delhi, Pandey stressed that India requires robust capital markets capable of mobilizing capital, managing risk, and maintaining investor confidence. The remarks come as SEBI finalizes its stance on the revised auction architecture following widespread market feedback.

Massive Market Response to CAS Consultation

SEBI had issued a consultation paper inviting public inputs on proposed changes to the CAS framework, market timings, and the methodology used to calculate settlement prices for index and stock derivative contracts on expiry days.

While initial estimates indicated around 3,500 submissions, SEBI confirmed that the total volume of comments surged to 20,000 by the close of the consultation window on October 3. The regulator noted that it plans to review the feedback swiftly, as the proposals outlined in the paper are well-defined, with an official circular expected soon.

Key Focus Areas under Regulatory Review:

• Derivatives Settlement Methodology: Addressing sharp swings and price divergence observed between spot and derivative segments on expiry days under the auction framework.
• Transition Between Sessions: Refining the handover between continuous trading—which stops at 3:15 PM for eligible stocks—and the CAS order input window.
• Indicative Price Dissemination: Improving real-time transparency and indicative equilibrium price feeds to avoid sudden closing spikes.
• Cash Market Liquidity: Ensuring that institutional rebalancing and retail trades do not result in artificial intraday price distortions.

Mechanism Here to Stay Despite Teething Issues

The CAS mechanism was rolled out on August 3 for equities eligible for futures and options (F&O) trading. Designed to align India's market infrastructure with global standards, CAS replaced the traditional 30-minute Volume Weighted Average Price (VWAP) calculation with a dedicated call-auction mechanism to discover a single equilibrium closing price.

However, its implementation sparked debate across Dalal Street after early sessions triggered sharp closing-candle swings in benchmark indices like the Nifty 50 and Sensex. The anomalies prompted domestic brokers, proprietary desks, and institutional funds to raise concerns over liquidity bottlenecks and execution risks.

SEBI leadership has consistently clarified that the closing auction mechanism is here to stay, citing its successful use across mature global markets and its necessity for large passive funds and exchange-traded funds (ETFs) tracking benchmark indices. Nevertheless, the regulator has emphasized that it remains open to making technical and operational tweaks to eliminate friction and protect market integrity.

Impact on Indian Investors and Market Structure

For retail investors and domestic mutual funds, the resolution of CAS-related volatility is critical. Because closing prices directly determine mutual fund Net Asset Values (NAVs), index rebalancing values, and final cash-settlement payouts for derivative contracts, an orderly closing price formation protects market participants from artificial settlement distortions.

Pandey also noted that SEBI’s broader regulatory agenda remains directed at deepening liquidity in the cash market, refining securities lending and borrowing (SLB) frameworks, and creating more efficient arbitrage channels between cash and derivatives to support orderly market functioning.

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