Description
BSE Index Services announces change in calculation frequency for BSE Largecap, Midcap, and Smallcap indices from real-time to end-of-day effective January 27, 2026.
Summary
BSE Index Services Private Ltd announces a change in the calculation frequency of three major BSE indices - BSE Largecap, BSE Midcap, and BSE Smallcap - from real-time to end-of-day calculation effective January 27, 2026. This operational change will affect how frequently these index values are updated and published.
Key Points
- Three BSE indices will move from real-time to end-of-day calculation frequency
- Affected indices: BSE Largecap, BSE Midcap, and BSE Smallcap
- Change becomes effective from January 27, 2026
- Queries can be directed to bseindex@bseindia.com
- Announcement made by BSE Index Services Private Ltd (formerly Asia Index Pvt. Ltd.)
Regulatory Changes
No regulatory changes. This is an operational modification to index calculation methodology by BSE Index Services Private Ltd.
Compliance Requirements
No compliance requirements or actions needed from market participants. This is an operational change managed by BSE Index Services.
Important Dates
- Notice Date: January 20, 2026
- Effective Date: January 27, 2026
Impact Assessment
Market Impact: Medium - The change affects data availability and frequency for three widely-tracked BSE indices. Market participants relying on real-time values for these specific indices will need to adjust their systems and processes.
Operational Impact: Users of BSE Largecap, Midcap, and Smallcap indices will receive updates only at end-of-day rather than continuously throughout trading hours. This may affect algorithmic trading strategies, portfolio tracking systems, and other applications that rely on intraday index values.
Note: The flagship SENSEX index is not affected by this change and continues with its existing calculation frequency.
Impact Justification
Operational change affecting three major BSE indices; impacts data availability but not trading or compliance obligations