Increase in Number of Partitions in Equity Derivatives Segment
BSE notice 20260828-12 · 28 Aug 2026
Official title
Increase in Number of Partitions from 12 to 14 in Equity Derivatives Segment
Official record
Open source pageSummary
Check the official recordWhat changed
The Exchange increases the number of partitions in the Equity Derivatives segment from 14 to 16. This change takes effect on September 7, 2026. Trading members must update ETI-based applications to query for 16 partitions. Members must also update EOBI and EMDI applications to accommodate product movements between partitions. Market data for a product is available only from the multicast stream of the assigned partition. The Exchange provides partition details in the Equity Derivatives master file. Members should refer to the BOLTPLUS Configuration file for multicast stream details. A mock session occurs on September 5, 2026, to test the new partitions.
What you must do
- Update ETI applications to query for 16 partitions.
- Update EOBI and EMDI applications to accommodate product movements.
Key dates
- Mock session date
Document text
[Image omitted. See the official document.]
NOTICE
| Notice No. | 20260828-12 |
|---|---|
| Notice Date | 28 Aug 2026 |
| Category | Trading |
| Segment | Derivatives |
| Department | Trading Operations |
| Subject | Increase in Number of Partitions from 12 to 14 in Equity Derivatives Segment |
| Attachments | BOLTPLUS_Connectivity_Manual |
[Image omitted. See the official document.]
Trading Members are hereby informed that the number of partitions in the Equity Derivatives segment will be increased from 14 to 16, effective September 7, 2026. Each partition serves a set of products, and from the effective date, trading will be conducted across 16 partitions for all products.
Partition Information:
Partition details are available in the Equity Derivatives master file (EQD_CODDMMYY.csv) under column 13 (Partition ID).
Impact on ETI-Based Applications
- All ETI applications utilizing Partition ID for retransmission of orders, trades, or other partition-oriented messages must be updated to query for 16 partitions instead of 14.
- The number of partitions is also included in the Session Logon Response (Template ID 10001) message of the ETI API under the field name NoOfPartition(1770).
Product Movement
- The Exchange will gradually create new products and may move certain products from the existing 14 partitions to new partitions 15 and 16.
- Any change in partition assignment will be reflected in the EQD_CODDMMYY.csv file.
Impact on EMDI/EOBI
- Movement of products between partitions will affect the existing EOBI/EOBI streams, as these are partition-wise multicast streams.
- Market data for a product will be available only from the multicast stream of the partition to which it has been moved.
- Please refer to the BOLTPLUS Configuration file version 1.18 (attached) for details on partition-wise multicast streams of EMDI and EOBI. The file is also available at www.bseindia.com/nta.aspx.
All members are requested to make necessary changes in their EOBI/EMDI applications to accommodate ongoing product movements.
Testing and Simulation
- A mock session will be conducted on September 5, 2026, for members to test the addition of new partitions.
- Partitions 15 and 16 are already available in the Simulation environment for testing from August, 2026.
[Image omitted. See the official document.]
For further queries, please contact the IML Tech Support team at 22728053 or email bse.tech@bseindia.com.
For and on behalf of the Exchange
| Ketan Jantre | Nawaid Pathan |
|---|---|
| Head – Trading Operations | Vice President – Information Technology |
Source details
- Source
- BSE Ltd (Bombay Stock Exchange)
- Type
- notice
- Published by source
- 28 Aug 2026
- Document number
- 20260828-12
- Issuing division
- Trading Operations
- Effective date
- 07 Sept 2026
- Coverage area
- securities