SEBI: New Closing Auction Session Free of Manipulation

Securities and Exchange Board of India (SEBI) Chairman Tuhin Kanta Pandey confirmed no evidence of manipulation in the newly implemented Closing Auction Session (CAS). This crucial market structure reform began on August 3.

Pandey highlighted CAS as a significant step aligning Indian markets with international best practices. SEBI is actively reviewing stakeholder feedback to boost participation in this transparent system.

Global Alignment and Key Features

• CAS mirrors systems in major global markets like Japan, Hong Kong, the US, Germany, Europe, and Australia.

The introduction of CAS became necessary due to evolving trends within Indian capital markets. Specifically, two key factors drove this reform.

• Passive investing is growing, with passive funds forming a significant portion of both foreign portfolio investor and domestic mutual fund equity assets under management.
• The increasing weight of Indian stocks in global indices demanded more precise execution at closing prices to minimize tracking errors effectively.

This new mechanism fundamentally changes how closing prices are determined for certain stocks. It replaces an older, less precise method.

Understanding the CAS Mechanism

• CAS features a dedicated 20-minute session.
• During this time, buy and sell orders are collected.
• An equilibrium closing price is established for stocks with futures and options contracts.
• This replaces the previous method, which used a weighted average of trades from the final 30 minutes of the regular trading session.

SEBI believes this framework will enhance cross-market consistency and improve India’s price discovery mechanism, making it more robust, fair, and transparent. However, its initial rollout saw some market adjustment.

Following its introduction, there was some initial market uncertainty, marked by a divergence between the Sensex and Nifty. Vinod Nair, Head of Research at Geojit Investments, clarified that these were not fundamental structural concerns and were expected to be brought under control, with the impact primarily limited to the F&O segment of trading stocks and main indices.

The market regulator’s affirmation of no manipulation, coupled with ongoing efforts to gather stakeholder feedback, underscores its commitment to refining this critical reform. This aims to bolster confidence in India’s capital market infrastructure.