NOTICE
Notice No. 20260716-3
Notice Date 16 Jul 2026
Category Trading
Segment Equity
Department Trading Operations
Subject Mock Trading on Saturday, July 18, 2026, for Equity segment
Attachments No Attachment
Exchange has scheduled a mock trading session (from PR site) in Equity segment on July 18th, 2026. As per circular no. 20260319-21 & 20260610-41 issued regarding introduction of Closing Auction Session (CAS) & Standard Operating Procedures, mock trading session has been scheduled on July 18th, 2026 as follows –
- Mock trading session 1 - To facilitate testing of changes related to Closing Auction Session (CAS).
- Mock trading session 2 - To test trading functionalities without CAS changes, to facilitate live trading from Monday July 20, 2026.
A. Mock Trading Session 1
| TRADING SESSIONS | FROM | TO |
|---|
| Log-in | 08:15 am | 08:45 am |
| 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 | 12:15 pm |
| Continuous Trading T+0 | 09:15 am | 10.30 am |
| 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 | 12:15 pm |
| Periodic Call Auction (2 sessions of 30 minutes each) ^ | 09:30 am | 10:30 am |
| Block Deal Window (Session 2) | 10:05 am | 10:20 am |
| Closing Auction Session | | |
| Reference price calculation (Transition from CTS to CAS) | 10:40 am | 10:45 am |
| Order Entry Period for both limit and market orders | 10:45 am | 11:30 am |
| Order entry period only for limit orders *Random stoppage of order entry in last 2 mins | 11:30 am | 12:15 pm* |
| Order Matching/Confirmation Period | 12:15 pm | 12:20 pm |
| Closing | 12:15 pm | 12:35 pm |
| Post- closing | 12:35 am | 12:45 pm |
| Trade Modification T+1 | | 12:15 pm |
| Trade Modification T+0 | | 10.35 am |
^ - Random stoppage of order entry session in last 1 minute for Pre-Open & Periodic Call Auction
^^ - Random stoppage of order entry session in last 10 minutes for Special Pre-Open for IPO & Re-listed scrips
B. Mock Trading Session 2
| TRADING SESSIONS | FROM | TO |
|---|
| Log-in | 02:30 pm | 02:45 pm |
| Morning Block Deal (Session 1) | 02:45 pm | 03:00 pm |
| Pre-Open | | |
| · Order Entry period | 03:00 pm | 03:38 pm^ |
| · Matching & buffer period | 03:38 pm | 03:45 pm |
| Continuous Trading T+1 | 03:45 pm | 05:30 pm |
| Continuous Trading T+0 | 03:45 pm |
^ - Random stoppage of order entry session in last 1 minute for Pre-Open & Periodic Call Auction
^^ - Random stoppage of order entry session in last 10 minutes for Special Pre-Open for IPO & Re-listed scrips
C. Trading members are requested to note following Important instructions -
- A separate test scrip master file shall be provided for testing Closing Auction Session (CAS) during the mock session. This will be in addition to the scrip master files provided for live trading.
- Test scrip master file will have selected securities on which CAS shall be scheduled during mock. Kindly refer the exchange circular - 20260330-40 & 20260422-15 for CAS session identifier introduced in scrip master format.
- This test scrip master file shall be made available on Friday July 17, 2026 on or before 11:00pm on the Exchange website at the following location - https://www.bseindia.com/members/index as a separate hyperlink with file name as Mock_18-07-2026.zip.
- After the mock trading session 1, members are requested to replace the test file with the appropriate scrip master file to be used for live trading on Monday, July 20, 2026.
- New version of BOLT Pro TWS
- New version of BOLT Pro TWS 13.30 for CAS functionality testing during 1st mock trading session. It shall be available for download on July 18, 2026 via DLOAD only via lease line connectivity and shall not be available to connect via internet.
- New version of BOLT Pro TWS 13.25 for 2nd mock trading session, as well as for live trading from Monday July 20, 2026. It shall be available for download on July 17, 2026 from 7:00 pm onwards. Details for same shall be published via separate circular.
All trading members are requested to ensure that BOLT Pro TWS version 13.25 should be used for live trading from Monday July 20, 2026
- Trades of Trading session 1 shall not be available in Trading session 2
- In mock trading session 1, market data via NFCAST stream shall be available as per new format (version 6.2 published via circular no. 20260709-11) on the existing multicast IP & Port (multicast IP - 227.0.0.1 & Port - 18901)
- In mock trading session 2, and for live trading from Monday July 20, 2026, market data via NFCAST stream shall be available as per existing format (version 5.0) on the existing multicast IP & Port.
- As informed via circular no. 20260709-11, market data stream MDI / EMDI API with new version 1.4.5 shall be available during mock trading sessions 1 & 2 and continue for live trading from July 20, 2026 in the Equity segment.
- Closing reference price for CAS eligible securities shall be calculated based on VWAP of trades executed between 10:25am - 10:40am.
Trading members using third party trading application are requested to take note and use this opportunity to test their respective trading application for CAS functionality during mock trading session.
Market participants are requested to note that the mock trading session is merely for the purpose of testing and familiarization and that the trades resulting from such mock trading will not attract any margin obligation or pay-in and pay-out obligation and will not create any rights and liabilities. Participants are requested to participate actively in the mock trading sessions.
Feedback of Mock Trading Session
To be able to provide our members with a robust & efficient system for trading with better features, feedback from all members is very important. We solicit your active support and participation in this endeavor. We request all members to give their feedback for the mock trading session on the contact numbers/ email id provided below by 6:30 pm.
In case of any queries or clarifications, trading members may kindly get in touch with their respective Relationship Manager or contact either the BSE Helpdesk or the BSE Tech Support team teams for any clarification/ queries on this circular –
For and on behalf of BSE Ltd.,
Ketan Jantre
Head - Trading Operations
Sandeep Pujari
DVP – Trading Operations
