National 17 October 2026
SEBI Announces Revisions to Closing Auction Session Framework
Why in the News?
The Securities and Exchange Board of India (**SEBI**) announced revised guidelines for the **Closing Auction Session (CAS)** framework, introducing major changes to settlement methodology, trading timings, and the transition of unexecuted iceberg orders.
Key Features / Major Points:
- Effective Dates: The revised framework will take effect from **December 7, 2026**, while rules regarding the transition of unexecuted limit and iceberg orders from CTS to CAS will apply from **February 8, 2027**.
- Settlement Price Retained: SEBI retained the 30-minute Volume-Weighted Average Price (**VWAP**) methodology during the last 30 minutes of continuous trading (3:00 PM to 3:30 PM) for index and stock derivatives settlement.
- Revised Trading Timings:
- CAS will run as a 10-minute separate session from **3:30 PM to 3:40 PM** (order-entry closes randomly between 3:38 PM and 3:40 PM).
- Post-close session in the cash segment will operate from **3:50 PM to 4:00 PM**.
- Trading in index and stock derivatives will extend until **3:45 PM**.
- Iceberg Orders Transition: An iceberg order is a large order split into smaller visible tranches. Unexecuted iceberg orders within applicable price bands will be converted into fully disclosed limit orders during CAS with adjusted time priority.
Static GK Facts:
- SEBI (Securities and Exchange Board of India): Statutory regulator for the securities and commodity markets in India.
- Establishment of SEBI: Established on April 12, 1988, and given statutory powers on January 30, 1992, through the SEBI Act, 1992.
- SEBI Headquarters: Mumbai, Maharashtra.
- Iceberg Order: A trading strategy used by large investors to break up huge orders into smaller parts to prevent sudden market impact.
One-Liner Quiz (All Competitive Exams):
Q: Which regulatory body introduced revisions to the Closing Auction Session (CAS) framework in India?
A: Securities and Exchange Board of India (SEBI)
Q: What is the new duration and timing fixed for the Closing Auction Session (CAS)?
A: 10 minutes (3:30 PM to 3:40 PM)
Q: Where is the headquarters of SEBI located?
A: Mumbai, Maharashtra
Q: What pricing mechanism is used by SEBI for calculating the final settlement price of derivatives?
A: VWAP (Volume-Weighted Average Price)
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