Closing Auction Session Timings in Equity Segment
BSE notice 20260801-1 · 01 Aug 2026
Official title
Closing Auction Session (CAS) Timings in Equity Segment
Official record
Open source pageSummary
Check the official recordWhat changed
BSE has announced the implementation of a Closing Auction Session (CAS) in the Equity segment, effective August 3, 2026. This update modifies the trading hours previously established in Exchange Notice No. 20260430-18. The new schedule introduces specific windows for the Closing Auction, including a transition period from Continuous Trading to CAS (03:15 pm to 03:20 pm), an order entry period for limit and market orders (03:20 pm to 03:25 pm), an order entry period for limit orders only (03:25 pm to 03:30 pm), and an order matching/confirmation period (03:30 pm to 03:35 pm). Trading members are required to adhere to these revised session timings for all equity trading activities.
What you must do
- Trading members must follow the updated trading session timings for the Equity segment.
Key dates
- Effective from
- 03 Aug 2026
Document text
NOTICE
Notice No. 20260801-1 Notice Date 01 Aug 2026 Category Trading Segment Equity Department Trading Operations Subject Closing Auction Session (CAS) Timings in Equity Segment Attachments No Attachment
In partial modification of Exchange Notice No. 20260430-18 dated April 30, 2026, in respect of trading hours, Trading Members are hereby informed that, pursuant to the introduction of the Closing Auction Session w.e.f from August 03, 2026, the timings for the same as below:
| TRADING SESSIONS | FROM | TO |
|---|---|---|
| Block Deal Window (Session 1) | 08:45 am | 09:00 am |
| Pre-Open | ||
| · Order Entry period | 09:00 am | 09:08 am^ |
| · Matching & buffer period | 09:08 am | 09:15 am |
| Continuous Trading T+1 | 09:15 am | 03:30 pm |
| Continuous Trading T+0 | 09:15 am | 01.30 pm |
| Special Pre-Open for IPO & Re-listed scrips# | ||
| · Order Entry period | 09:00 am | 09:45 am^^ |
| · Matching & buffer period | 09:45 am | 10:00 am |
| Continuous Trading# for SPOS Scrips | 10:00 am | 03:30 pm |
| Periodic Call Auction (6 sessions of 1 hour each) ^ | 09:30 am | 03:30 pm |
| Block Deal Window (Session 2) | 02:05 pm | 02:20 pm |
| Closing Auction | ||
| Continuous Trading session end & Reference price calculation (Transition from CTS to CAS) | 03:15 pm | 03:20 pm |
| Order Entry Period for both limit and market orders | 03:20 pm | 03:25 pm |
| Order entry period only for limit orders | 03:25 pm | 03:30 pm* |
| Order Matching/Confirmation Period | 03:30 pm* | 03:35 pm |
| Closing (for non-CAS securities) | 03:30 pm | 03:50 pm |
| Closing (Buffer Period for CAS securities) | 03:35 pm | 03:50 pm |
| Post- closing | 03:50 pm | 04:00 pm |
| Trade Modification T+1 | 04:15 pm | |
| Trade Modification T+0 | 01:45 pm |
^ - Random stoppage of order entry session in last 1 minute for Pre-Open session & Periodic Call Auction ^^ - Random stoppage of order entry session in last 10 minutes for Special Pre-Open for IPO & Re-listed scrips.
-
- Random stoppage of order entry in last 2 minutes & order matching period will start immediately after completion of order entry period.
For and on behalf of BSE Ltd.,
Ketan Jantre Head - Trading Operations
Kaushal Mehta VP – Trading Operations
Source details
- Source
- BSE Ltd (Bombay Stock Exchange)
- Type
- notice
- Published by source
- 01 Aug 2026
- Document number
- 20260801-1
- Issuing division
- Trading Operations
- Effective date
- 03 Aug 2026
- Coverage area
- securities