SEBI Finds No Manipulation in India's New Closing Auction Session

India's stock-market closing process has recently undergone a major change.

SEBI Chairman Tuhin Kanta Pandey said on August 12, 2026 that the regulator had found no evidence of manipulation in the newly introduced closing auction session.

What changed?

The new mechanism uses a separate 20-minute closing auction to determine the closing price.

Buy and sell orders are collected during the auction, with the closing price determined at the level where the maximum volume can be executed.

This replaced the previous method based on the average traded price during the final 30 minutes of regular trading.

Why was the change introduced?

The reform is intended to make closing prices more transparent and efficient and to align the process more closely with international market practices.

Closing prices matter beyond a single trading session.

They can affect index calculations, portfolio valuations, passive funds and benchmark tracking.

Participation is increasing

SEBI said mutual-fund participation increased from roughly 5%-6% on the first day to about 20%-25% subsequently.

The regulator expects participation to develop as market participants become more familiar with the mechanism.

Why traders should understand the closing auction

A trader who relies heavily on the final minutes of the market should understand that the price discovery process has changed.

Historical intraday data and strategy assumptions may need to be considered carefully when analysing the final portion of the session.

For systematic strategies, changes in market structure can matter because the behaviour of the closing price and execution near the close may differ from historical periods.

SignBot perspective

A strategy should not assume that a market rule remains unchanged forever.

Exchange mechanisms, contract specifications and market rules can evolve.

This is one reason traders should periodically review their strategy assumptions and test whether the system still behaves as expected.

Source note: Regulatory details are based on Reuters reporting on SEBI's August 12, 2026 comments.

*This article is educational market information, not investment advice.*