Description

BSE announces mock trading session on Saturday, December 06, 2025 for Equity segment to test trading platforms, new BOLT Pro TWS version 12.40, and updated block deal framework.

Summary

BSE has scheduled a mock trading session for the Equity segment on Saturday, December 06, 2025. This session allows trading members to test their platforms and comply with SEBI regulatory requirements. The mock session will include testing of the new BOLT Pro TWS version 12.40 and the updated block deal framework scheduled to go live on December 08, 2025.

Key Points

  • Mock trading session scheduled for Saturday, December 06, 2025
  • Members can participate in either Mock Trading Session or UAT environment to meet SEBI requirements (circular SEBI/HO/MRD1/DSAP/CIR/P/2020/234 dated November 24, 2020)
  • New BOLT Pro TWS version 12.40 will be released (details in separate circular)
  • Updated block deal framework (per circular 20251121-69 dated November 21, 2025) to be tested during mock session
  • Third-party trading platform users can test various functionalities including call auction sessions, risk-reduction mode, trading halt, and block deals
  • Feedback to be submitted by 4:30 PM on mock trading day

Regulatory Changes

  • Review of block deal framework (circular 20251121-69 dated November 21, 2025) will go live from Monday, December 08, 2025
  • Members must comply with SEBI circular no. SEBI/HO/MRD1/DSAP/CIR/P/2020/234 dated November 24, 2020 regarding testing of trading and risk management software

Compliance Requirements

  • Trading members should participate in mock trading session or UAT environment to fulfill regulatory requirements
  • Members using third-party trading platforms should test their applications during the mock session
  • Members must test various functionalities including exceptional market conditions, call auction sessions, risk-reduction mode, trading halt, and block deals
  • Feedback must be submitted by 4:30 PM on December 06, 2025
  • Members should refer to Exchange Notice No 20201201-22 dated December 1, 2020 regarding testing requirements

Important Dates

  • December 06, 2025 (Saturday): Mock trading session for Equity segment
  • December 08, 2025 (Monday): Updated block deal framework goes live
  • 4:30 PM on December 06, 2025: Deadline for feedback submission

Mock Trading Session Timings (December 06, 2025)

  • Log-in: 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 Period: 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 - 10:00 AM
  • 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

Operational Impact: Medium - Trading members need to allocate resources for mock trading participation and testing. This is crucial for ensuring smooth transition to new BOLT Pro TWS version 12.40 and updated block deal framework.

Market Impact: Low - No impact on live trading as this is a mock session conducted on Saturday when markets are closed.

Member Impact: Medium - Members must participate to comply with SEBI testing requirements and prepare for the new block deal framework going live on December 08, 2025. Third-party platform users have opportunity to test exceptional market conditions.

Contact Information:

Impact Justification

Scheduled mock trading session for system testing and validation. Important for members to test new BOLT Pro TWS version 12.40 and updated block deal framework before live implementation on December 08, 2025.