NSE Revises Pre-Open Session Framework for Equity Derivatives. Effective Date: 7 September 2026
NSE Revises Pre-Open Session Framework for Equity Derivatives. Effective Date: 7 September 2026
The National Stock Exchange (NSE) has introduced changes to the Pre-Open Session framework for the Equity Derivatives segment, effective 7 September 2026.
Key Changes:
Session | Current Timings | Revised Timings (Effective 7 Sept 2026) | Permitted Activities |
|---|---|---|---|
| Order Entry Period – Phase 1 | 9:00 AM – 9:08 AM* | 9:00 AM – 9:05 AM | Order entry, modification, and cancellation allowed for Limit & Market Orders. |
| Order Entry Period – Phase 2 | Not Applicable | 9:05 AM – 9:10 AM* | Only Limit Orders can be placed, modified, or cancelled. Market Orders are not allowed and will be rejected. (Random closure during the last 2 minutes.) |
| Order Matching & Trade Confirmation | 9:08 AM* – 9:12 AM | 9:10 AM – 9:12 AM* | Opening price determination, order matching, and trade confirmation. |
| Buffer Period | 9:12 AM – 9:15 AM | 9:12 AM – 9:15 AM | Transition from Pre-Open Session to Continuous Trading Session. |
*Note: The Order Entry Period closes randomly during the last 2 minutes, after which the Order Matching Period begins immediately.
Important Highlights
- Market Orders can only be placed between 9:00 AM and 9:05 AM.
- Between 9:05 AM and 9:10 AM, only Limit Orders are permitted
- Any Market Order submitted after 9:05 AM during the Pre-Open Session will be rejected by the Exchange.
- Algo market orders shall be allowed during initial 5 mins of order entry period when both limit and market orders are allowed.
- These changes are applicable to the Equity Derivatives (F&O) segment and will be effective from 7 September 2026.
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