BSE has initiated a switchover of its trading systems from the Primary (PR) location to the Disaster Recovery (DR) location on 18 April 2026. This notice provides the mock trading session schedule for all segments post-switchover, in continuation of Notice Nos. 20260417-1,2,3,4,5 dated 17 April 2026. Trading in the Pre-Open session commences at 11:45 am at the DR location.

Key Points

• Trading systems switched from PR to DR location on 18 April 2026
• Pre-Open session begins at 11:45 am at DR location for all segments
• Segments covered: Equity, Equity Derivatives, Currency Derivatives, Commodity Derivatives, and Electronic Gold Receipts (EGR)
• Continuous Trading (T+1) runs from 12:00 pm to 1:45 pm; Continuous Trading (T+0) runs from 12:00 pm to 1:30 pm
• Continuation of multiple notices issued on 17 April 2026

Regulatory Changes

No permanent regulatory changes. This is an operational mock exercise to test DR site readiness with modified intraday session timings applicable only for 18 April 2026.

Compliance Requirements

• All trading members must be aware of the revised session timings and plan order entry accordingly
• Members participating in IPO/re-listed scrips, SPOS, Block Deal, and Auction sessions must note the specific DR mock timings
• Trade modifications must be completed within the specified windows (by 2:15 pm for T+1, by 1:45 pm for T+0)

Important Dates

• 18 April 2026: PR to DR switchover mock day; all revised timings apply
• 11:45 am: Pre-Open Order Entry begins (Equity, Equity Derivatives, Currency Derivatives)
• 12:00 pm: Continuous Trading begins (Equity and Equity Derivatives)
• 1:45 pm: Continuous Trading ends (Equity T+1, Equity Derivatives, Currency Derivatives)
• 1:30 pm: Continuous Trading T+0 ends (Equity)
• 2:05 pm: Post-Closing ends (Equity)
• 2:15 pm: Trade Modification T+1 deadline

Impact Assessment

This mock DR switchover affects all market participants across every traded segment on BSE. Trading hours are shifted later than normal, starting at 11:45 am instead of the standard 9:15 am. Market participants—brokers, institutional investors, algo traders—must update their systems and risk controls to reflect the revised schedule. The mock is a system resilience test; actual trades executed during this session are subject to normal settlement obligations. Members should ensure connectivity to BSE’s DR infrastructure is tested and functional.