Skip to content
Revision In Tick Size for Block Trading Session
- Deadline
- 12 Oct 2026 · 25 days ago · Effective date of the revised tick size.
- Who
- All trading members of the National Stock Exchange of India Limited.
- Action
- Members must load the updated security files into their trading applications before trading on the effective date.
What changed
The National Stock Exchange of India Limited revises the tick size for the Block Trading session. The exchange sets a default tick size of 0.01 for all securities in the BL and TL series. This change replaces the previous price-based tick size structure. All trading members must update their trading applications with the latest security files before the effective date. Members can download the updated security files from the Extranet server or the official website. The new tick size applies from October 12, 2026.
What you must do
- Members must load the updated security files into their trading applications before trading on the effective date.
Key dates
- Effective from
- 12 Oct 2026
Document text
[Image omitted. See the official document.]
[Image omitted. See the official document.]
National Stock Exchange of India Limited
Circular
| Department: CAPITAL MARKET SEGMENT | |
| Download Ref No: NSE/CMTR/76441 | Date: September 21, 2026 |
| Circular Ref. No: 131/2026 | |
All Members,
Revision In Tick Size for Block Trading Session
This is w.r.t Chapter 3.3 Tick Size in Exchange Capital Market Consolidated Circular ref NSE/CMTR/73927 dated April 28, 2026. Please note the following revised tick size changes applicable for the Block Trading session, effective from October 12, 2026.:
| Current Applicable Tick Size in Block Trading session | Revised Applicable Tick Size Block Trading session (BL and TL series) | ||
|---|---|---|---|
| Underlying Security Price | Tick Size | ||
| From | To | ||
| Below 250 | 0.01 | The default tick size shall be 0.01 | |
| ≥ 250 | 1,000 | 0.05 | |
| > 1,000 | 5,000 | 0.10 | |
| > 5,000 | 10,000 | 0.50 | |
| > 10,000 | 20,000 | 1.00 | |
| > 20,000 | 5.00 | ||
Members are advised to load the updated security.gz/nnf_security.gz/NSE_CM_security_ddmmyyyy.csv.gz file in the trading application before trading on the effective date. These files can be obtained from the directory common/NTNEAT on the Extranet server. The security file (CM-MII-Security File (.gz)) is also downloaded on daily basis on NSE website on the below path: https://www.nseindia.com/all-reports
For and on behalf of
National Stock Exchange of India Limited
Aarti Surve
Chief Manager
| Toll Free No | Email id |
|---|---|
| 1800-266-0050 (Option 1) | msm@nse.co.in |
Source details
- Source
- National Stock Exchange of India
- Type
- circular
- Published by source
- 21 Sept 2026
- Document number
- NSE/CMTR/76441
- Issuing division
- CAPITAL MARKET SEGMENT
- Effective date
- 12 Oct 2026
- Coverage area
- securities