Key takeaways
- BSE said it initiated a primary-to-disaster-recovery switchover and scheduled a mock on Saturday, 12 September.
- The mock was not a regular cash-market session and did not create a normal Saturday market close.
- Equity pre-open was scheduled at 12:45 IST, T+1 continuous trading at 13:00–14:45 and the sequence through 15:15.
- The notice said primary-site orders would be purged and requested member feedback by 19:00 IST.
- The reviewed notice does not independently prove successful completion or a permanent change in hours.
A mock session, not a regular Saturday market
BSE Notice 20260912-1 said the exchange initiated a switchover from its primary location to its disaster-recovery location and set a mock-market timetable for 12 September 2026. The date was a Saturday, when there was no regular NSE or BSE cash-market session to summarise. The controlled exercise should not be used as a substitute for a normal market close.
The status is “Operational mock — completion not independently verified.” BSE's notice supports that it initiated the switchover and scheduled test activity. It does not serve as an outcome report confirming every phase, every connection or the quality of execution. Nor does it establish a permanent change to production trading hours.
What Notice 20260912-1 says
The notice sets out activity after the primary-to-disaster-recovery transition across equity and derivatives-related segments. It says outstanding orders at the primary site would be purged before trading from the recovery location. This creates a controlled starting point for participants connecting to the designated test environment rather than carrying over an assumed production order state.
The notice is an operating schedule and instruction for the mock. It establishes what BSE announced and intended to run. It does not provide post-event logs, member-connection results, incident data or a completion certification. Any conclusion about success or failure would therefore require a separate follow-up record rather than an inference from the timetable.
Selected equity and derivatives times in IST
For equity, the notice scheduled pre-open at 12:45 IST, T+1 continuous trading from 13:00 to 14:45, and a sequence extending through 15:15. For equity derivatives, it scheduled the switchover window from 12:00 to 12:45 and disaster-recovery trading from 13:00 to 14:55. These times belong to the 12 September mock timetable.
They are not new weekday market hours and should not be carried into another date without a fresh BSE notice. Different segments can have separate testing phases and endpoints, so a single time should not be generalised to the whole exchange. The article uses selected times only to explain the shape of the announced exercise, not to provide live access instructions.
Purpose and limits of a disaster-recovery mock
A disaster-recovery exercise gives an exchange and its members a controlled setting to practise operating from backup infrastructure and observe whether defined workflows can proceed. It can include connection, order, trading and post-close stages. The existence of a mock reflects resilience planning; it does not imply that the primary site had suffered a production failure.
A timetable alone also cannot prove resilience performance. Completion, member participation, defects, latency, reconciliation and recovery objectives would need outcome evidence. The notice reviewed here does not independently establish that all members connected or that every stage met its expected result. Those questions remain outside the supported claim scope.
Order purge, pre-open and auction elements
Purging outstanding primary-site orders before recovery-site trading helps prevent the test from assuming that all earlier orders remain valid in the new environment. A pre-open phase then provides an organised opening sequence for the mock. The timetable also includes market components that resemble familiar production processes, but they remain parts of a controlled exercise.
Similar labels do not turn the mock into regular price discovery. Prices or trades generated in a test context should not be presented as the day's cash-market close, breadth or turnover. The exercise and SEBI's separate closing-auction consultation also have different statuses: one is an exchange operational mock, while the other is a regulator consultation about possible market-design changes.
What completion and feedback would show
The notice requested member feedback by 19:00 IST, indicating that observations after the scheduled phases formed part of the process. A BSE completion report, member-feedback summary or incident disclosure could clarify what happened. In their absence, it is not defensible to label the exercise successful, failed or complete merely because its scheduled end time passed.
A later result should be read for its exact scope. Confirmation that one segment completed would not automatically establish every segment completed. A report of an issue would need to describe its effect rather than being converted into a broad outage claim. A permanent-hours change would require its own formal circular and should not be inferred from test times.
Current answer and update rule
For readers asking whether BSE was open on Saturday, the careful answer is that BSE scheduled a controlled mock after initiating a recovery-site switchover; there was no regular cash-market session. The primary notice supports the schedule and initiated action, while completion remains unverified. No production-market statistics or investment inference belongs in this account.
FinanceIndos published and reviewed this page on 12 September 2026 using BSE Notice 20260912-1 as private provenance. The page will be updated only for a completion or outcome notice, member-feedback summary or incident disclosure. It remains a historical operational record even after leaving prominent homepage rotation.
SOURCE, REVIEW & REVISION
How this guide is maintained
Reviewed by FinanceIndos Data Review Desk on 12 Sept 2026. Reviewer titles identify an internal source-review scope and do not imply individual professional advice or invented credentials.
Revision 1: Initial publication records BSE's initiated switchover and mock timetable while leaving phase completion and member outcomes unverified.
External source records are preserved in a private provenance ledger. Public citations and reading paths stay within FinanceIndos, while status words, dates and measurement limits remain visible in the article.