The Securities and Exchange Board of India (SEBI) has proposed significant tweaks to the Closing Auction Session (CAS) to address operational snags and ensure transparent expiry-day settlements.

  • SEBI is reviewing expiry-day settlement prices and market timings.
  • Aims to curb hyperactive trading driven by Indicative Equilibrium Price (IEP).
  • Two alternatives proposed: Blended VWAP or reverting to pre-CAS mechanism.
  • Proposal to stop displaying indicative index values to prevent misinterpretation.

The Securities and Exchange Board of India (SEBI) has moved to refine the newly implemented Closing Auction Session (CAS). In a consultation paper released on September 12, the market regulator proposed reviews of expiry-day settlement prices, market timings, and order handling processes following feedback regarding initial operational challenges.

The regulator noted significant 'hyperactivity' in expiring index options and derivatives trading during the CAS. This surge is largely attributed to trading based on the Indicative Equilibrium Price (IEP). To mitigate volatility and ensure a more orderly market, SEBI is looking at restructuring how settlement prices are determined for both index and stock derivatives.

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Proposed Settlement Methodologies

SEBI has outlined two primary alternatives for determining settlement prices on expiry days. The first approach involves adopting a blended volume-weighted average price (VWAP). The second approach suggests a temporary reversion to the pre-CAS settlement mechanism for expiry days, before eventually transitioning to the blended VWAP methodology.

Refining the settlement mechanism is crucial to prevent speculative spikes during the critical expiry window.

Why This Matters

BozokMedia analysis shows that these regulatory adjustments are vital for maintaining market integrity. The current trend of heightened activity during the CAS can lead to erratic price movements, which poses risks to both retail and institutional participants. By discontinuing the display of indicative index values, SEBI aims to prevent market participants from misinterpreting data and making reactionary trades during the auction session.

Historical Background

The introduction of the Closing Auction Session was intended to enhance price discovery at the end of the trading day. However, the transition period revealed that the current interaction between IEP and derivative contracts creates an environment of extreme volatility on expiry days, necessitating this consultative review by the regulator.

Did You Know?: The Indicative Equilibrium Price (IEP) is a calculated value used to show the potential price at which a security might trade during an auction.

Frequently Asked Questions

1. Will the Closing Auction Session (CAS) be abolished?
No, SEBI has indicated that the CAS will remain, but the rules governing its operation are being reviewed for improvement.

2. Why does SEBI want to stop showing the indicative index value?
To prevent market participants from misinterpreting the value, which could lead to artificial influence on trading and positions during the auction.