Description

BSE has scheduled a mock trading session for the Equity segment on Saturday, December 06, 2025, including testing of new BOLT Pro TWS version 12.40 and block deal framework changes.

Summary

BSE has scheduled a mock trading session for the Equity segment on Saturday, December 06, 2025. The session will allow trading members to test their systems and fulfill regulatory requirements under SEBI circular no. SEBI/HO/MRD1/DSAP/CIR/P/2020/234 dated November 24, 2020. Members can participate either in the mock trading session or UAT environment. The session will feature the new BOLT Pro TWS version 12.40 and allow testing of the revised block deal framework scheduled to go live on December 08, 2025.

Key Points

  • Mock trading session scheduled for Saturday, December 06, 2025 for Equity segment
  • Members can choose between mock trading session or UAT environment for regulatory compliance
  • New BOLT Pro TWS version 12.40 will be released (details in separate circular)
  • Opportunity to test various functionalities including call auction sessions, risk-reduction mode, trading halt, and block deals
  • Revised block deal framework (per circular 20251121-69) to be tested during mock session
  • Trading session timings mirror regular market hours with extended testing windows
  • Feedback required from all members by 4:30 PM on mock trading day

Regulatory Changes

The mock trading session references SEBI circular no. SEBI/HO/MRD1/DSAP/CIR/P/2020/234 dated November 24, 2020 regarding testing requirements for trading and risk management software. The session will also incorporate the revised block deal framework announced in BSE circular 20251121-69 dated November 21, 2025, which will go live from Monday, December 08, 2025.

Compliance Requirements

  • Trading members must participate in either mock trading session or UAT environment to fulfill regulatory requirements
  • Members using third-party trading platforms should test their applications during the mock session
  • Testing should cover various functionalities including exceptional market conditions
  • Members must provide feedback by 4:30 PM on the mock trading day
  • Members should refer to Exchange Notice No 20201201-22 dated December 1, 2020 regarding testing of software used in trading and risk management

Important Dates

  • December 04, 2025: Notice date
  • December 06, 2025: Mock trading session scheduled
  • December 08, 2025: Revised block deal framework goes live

Mock Trading Session Timings

  • Login: 08:15 AM - 08:45 AM
  • Morning Block Deal Window: 08:45 AM - 09:00 AM
  • Pre-Open Order Entry: 09:00 AM - 09:07/08 AM (random stoppage in last 1 minute)
  • Order Matching: 09:08 AM - 09:12 AM
  • Buffer Period: 09:12 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: 09:00 AM - 09:45 AM (order entry), 09:45 AM - 10:00 AM (matching)
  • Continuous Trading for SPOS Scrips: 10:00 AM - 03:30 PM
  • Periodic Call Auction: 10:30 AM - 03:30 PM (5 sessions of 1 hour)
  • Auction for Settlement Details: 12:00 PM - 12:45 PM
  • Afternoon Block Deal Window: 02:05 PM - 02:20 PM
  • Closing: 03:30 PM - 03:40 PM
  • Post-closing: 03:40 PM - 04:00 PM
  • Trade Modification T+1: Until 04:30 PM
  • Trade Modification T+0: 01:45 PM

Impact Assessment

This mock trading session has medium impact on market operations. It provides trading members with a critical opportunity to test their systems before the deployment of new BOLT Pro TWS version 12.40 and the revised block deal framework. Members using third-party platforms can ensure compatibility and test various market scenarios including exceptional conditions. The session helps ensure smooth market operations when changes go live on December 08, 2025. Non-participation could lead to operational issues for members when new systems are implemented.

Contact Information

For queries or clarifications:

Circular issued by: Ketan Jantre (Head - Trading Operations) and Sandeep Pujari (DVP - Trading Operations)

Impact Justification

Scheduled mock trading session for system testing and compliance with SEBI requirements; important for members to test new BOLT Pro TWS version 12.40 and updated block deal framework before live deployment on December 08, 2025