Archive · 12 Sep 2026
SEBI May Revise Closing Auction Settlement Rules After Volatility
India’s markets use a process called the Closing Auction Session to set some official closing prices.
SEBI is considering whether the rules for this process need changes.
The review is especially focused on how derivative prices are settled when contracts expire.
The auction begins after regular trading ends for certain stocks.
Recently, prices moved sharply during an expiry-day auction.
Some option prices rose several times over in a short period.
Traders worry that too few orders could have too much influence on prices.
SEBI is expected to keep the auction but may adjust its calculation methods.
SEBI may issue a consultation paper on the Closing Auction Session framework.
Potential changes could alter how derivative settlement prices are calculated on expiry days.
The Closing Auction Session is expected to continue rather than be withdrawn.
The mechanism began on August 3 for futures- and options-eligible stocks.
Traders say limited auction liquidity can amplify price movements and complicate options strategies.
- Who
- The Securities and Exchange Board of India, market participants, traders, and analysts.
- What
- SEBI may release a consultation paper proposing changes to the Closing Auction Session framework and derivative settlement-price methodology.
- When
- The Closing Auction Session was introduced on August 3, and the proposals could be considered at a SEBI board meeting on September 24.
- Where
- India’s securities markets, including trading in futures- and options-eligible stocks.
- Why
- Market participants have raised concerns about sharp expiry-day price movements, limited auction liquidity, and unreliable or difficult-to-predict derivative settlement prices.
Market Participants’ Concerns
SEBI’s Regulatory Approach
Whether the auction mechanism should change
Market Participants’ Concerns
Traders and analysts say the auction can create execution risks, especially when limited liquidity allows relatively few orders to influence closing prices.
SEBI’s Regulatory Approach
SEBI is not expected to withdraw the Closing Auction Session and is instead considering refinements to its methodology.
Expiry-day settlement prices
Market Participants’ Concerns
Market participants want more reliable and predictable settlement prices because sharp movements have affected derivative pricing and systematic options strategies.
SEBI’s Regulatory Approach
SEBI is considering changes focused on how derivative contracts’ settlement prices are determined during expiry sessions.
- Regulator
- Securities and Exchange Board of India (SEBI)
- Framework
- Closing Auction Session (CAS)
- Introduction date
- August 3
- Possible review date
- September 24 SEBI board meeting
- CAS timing
- Futures- and options-eligible stocks enter an auction after 3:15 pm, lasting roughly 20 minutes
- Other trading times
- Non-F&O shares trade until 3:30 pm; stock and index derivatives remain open until 3:40 pm
- Reported market impact
- The indicative Sensex closing level briefly fell about 2.5%, while some put option premiums surged roughly 400–500%