SEBI’s October 15, 2026 circular replaces the existing closing-auction design with a 10-minute Closing Auction Session (CAS) running from 3:30 p.m. to 3:40 p.m. on implementation day, December 7, 2026. It also sets different closing times for index and stock derivatives and keeps expiry-day settlement based on 30-minute VWAP calculations rather than the CAS auction price.
The supplied official regulatory and exchange material does not establish the percentage decline in BSE or NSE shares or prove that any market move was caused by the rule change. The operational changes below are the confirmed part of the announcement.
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What changes on December 7, 2026
The revised framework separates the closing auction from continuous cash-market trading and compresses the session to 10 minutes. The schedule is:
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- 3:31–3:36 p.m.: both market and limit orders may be entered.
- 3:36–3:38 p.m.: only limit orders may be entered.
- 3:38–3:40 p.m.: the system closes at a random time.
- After closure: orders are matched using the auction outcome.
Only market and limit orders are permitted during CAS. Participants cannot submit new iceberg orders or stop-loss orders in this session.
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How the CAS reference price is set
The reference price is the volume-weighted average price (VWAP) for the final 15 minutes of continuous cash trading. Under the revised timetable, that is the 3:15–3:30 p.m. period.
- If no trade occurs during those 15 minutes, the security’s last traded price for the day is used.
- If the security did not trade at all during the day, the previous trading day’s close is used.
- The fallback close is adjusted for applicable corporate actions.
This reference price anchors the CAS process; it is not itself necessarily the final auction price.
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How the old and revised regimes differ
NSE’s published description of the original Phase 1 implementation provides the baseline that the December changes replace for cash-market stocks with listed derivatives.
| Feature | Original Phase 1 design | Revised design from December 7, 2026 |
|---|---|---|
| CAS time | 3:15–3:35 p.m. (20 minutes) | 3:30–3:40 p.m. (10 minutes) |
| Reference-price VWAP | 3:00–3:15 p.m. | Last 15 minutes of continuous cash trading, 3:15–3:30 p.m. under the new schedule |
| Order-entry phases | Original framework used the earlier 20-minute structure | Market and limit orders 3:31–3:36; limit orders only 3:36–3:38; random closure 3:38–3:40 |
| Price band | ±3% band in the original NSE description | Orders outside the applicable CAS bands do not carry forward; the October 15 circular does not state a replacement percentage |
| Auction-price logic | Equilibrium price based on maximum executable volume, minimum imbalance and proximity to the reference price | The circular changes the session timetable and order treatment; the cited material does not specify a different ranking formula |
| Implementation | Original January 16, 2026 framework | Most provisions effective December 7, 2026 |
Derivative trading hours and expiry-day settlement
Trading cut-offs
- Index derivatives on regular days: trading continues until 3:45 p.m.
- Expiring index derivatives: trading ends at 3:30 p.m. on expiry days.
- Stock derivatives: trading continues until 3:45 p.m., including expiry days.
- Cash post-close session: remains 3:50–4:00 p.m.
What determines settlement on expiry days
For expiring index derivatives, settlement uses an index value calculated from the VWAPs of constituent stocks during the last 30 minutes of continuous cash trading. For expiring stock derivatives, settlement uses the underlying stock’s VWAP over that same 30-minute period, calculated across all stock exchanges.
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Therefore, expiry-day futures and options settlement is VWAP-based, not simply the CAS auction price. Exchanges must publish indicative VWAP and index values in real time during the 30-minute calculation window.
What happens to pending orders
Limit orders carried into CAS
An unexecuted limit order from continuous trading carries into CAS when it is within the applicable CAS price bands. Stop-loss orders and orders outside those bands do not carry forward.
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Iceberg-order transition
The special transition begins February 8, 2027, rather than December 7, 2026. From that date, an eligible unexecuted iceberg order can be carried forward as a fully disclosed limit order unless the trading participant opted out.
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Why SEBI revised the framework
SEBI’s January 16, 2026 circular described the CAS objective as transparent and efficient closing-price discovery. After reviewing implementation, public comments, recommendations from the Secondary Market Advisory Committee and discussions with exchanges, the October 15 circular says the revisions are intended to support efficient price discovery and orderly functioning of the cash and derivatives markets.
The changes address several practical points at once: a shorter auction window, a clearly defined 15-minute reference VWAP, separate treatment of expiry-day derivatives, and explicit handling of orders that remain unexecuted when continuous trading ends.
What traders should check before the first revised session
- Confirm that your trading platform shows the 3:30–3:40 p.m. CAS rather than the former 3:15–3:35 p.m. window.
- Do not assume a stop-loss or new iceberg instruction will be accepted during CAS.
- Check whether an unexecuted limit order is inside the applicable price band and therefore eligible to carry forward.
- On an expiry day, distinguish the 3:30 p.m. cut-off for expiring index derivatives from the 3:45 p.m. cut-off for stock derivatives and regular-day index derivatives.
- For an iceberg order that remains open after February 8, 2027, check whether your participant has opted out of the fully disclosed-limit transition.
What is—and is not—known about the BSE and NSE share move
The headline description of BSE and NSE shares falling is not quantified by the cited SEBI or exchange documents. Those materials also do not attribute a particular price move to the rule revision. A percentage change or causal explanation would require a dated market-data source. The confirmed news is the regulatory timetable and settlement framework, not a measured market reaction.
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