Increase in Number of Partitions in Equity Segment
BSE notice 20260604-6 · 04 Jun 2026
Official title
Increase in Number of Partitions from 4 to 5 in Equity Segment
Official record
Open source pageSummary
Check the official recordWhat changed
The Exchange increases the number of partitions in the Equity segment from 4 to 5. This change takes effect on June 15, 2026. Trading members must update ETI-based applications to query for 5 partitions instead of 4. 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 master file. A mock session occurs on June 13, 2026, to test the new partition structure.
What you must do
- Update ETI applications to query for 5 partitions
- Update EOBI and EMDI applications to accommodate product movements
Key dates
- Simulation environment availability
- 04 Apr 2026
Document text
[Image omitted. See the official document.]
NOTICE
| Notice No. | 20260604-6 |
|---|---|
| Notice Date | 04 Jun 2026 |
| Category | Trading |
| Segment | Equity |
| Department | Trading Operations |
| Subject | Increase in Number of Partitions from 4 to 5 in Equity Segment |
| Attachments | BOLTPLUSConnectivityManual |
Trading Members are hereby informed that the number of partitions in the Equity segment will be increased from 4 to 5, effective June 15, 2026. Each partition serves a set of products, and from the effective date, trading will be conducted across 5 partitions for all products.
Partition Information: Partition details are available in the Equity master file (BSE_EQ_SCRIP_DDMMYY.csv) under column 56 (UnqPdctIdr). Given by partition id-product id for e.g 4-261
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 5 partitions instead of 4.
- 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 4 partitions to new partition 5.
- Any change in partition assignment will be reflected in the BSE_EQ_SCRIP_DDMMYY.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 1.17 (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 June 13, 2026, for members to test the addition of new partitions.
- Partition 5 is already available in the Simulation environment for testing from April 4, 2026.
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
Head – Trading Operations
Nawaid Pathan
Vice President – Information Technology
Source details
- Source
- BSE Ltd (Bombay Stock Exchange)
- Type
- notice
- Published by source
- 04 Jun 2026
- Document number
- 20260604-6
- Issuing division
- Trading Operations
- Effective date
- 15 Jun 2026
- Coverage area
- securities