Pre-Trade Risk Controls: NNF ID-Algo ID Validation Updates · NSE/FAOP/76748
NSE circular NSE/FAOP/76748 · 06 Oct 2026
Official title
Pre-Trade risk controls - Pre-emptive order cancellation on account of NNF ID-Algo ID validations - Update
Official record
Open source pageSummary
Check the official recordWhat changed
The National Stock Exchange of India implements additional pre-trade risk controls for NNF ID and Algo ID validations. The Exchange rejects orders that do not meet specific digit requirements for NNF IDs or contain restricted Algo ID values. Members must ensure order messages comply with these validation rules to prevent rejection. The Exchange sends an error message to the NNF user when a rejection occurs. Members must refer to the NNF API protocol version 9.51 for error code and message details. These requirements apply to all trading members effective October 12, 2026.
What you must do
- Members must ensure order messages comply with the new NNF ID and Algo ID validation rules.
- Members must refer to the NNF API protocol version 9.51 for error code and message details.
Key dates
Document text
National Stock Exchange of India Limited
Circular
Department: FUTURES & OPTIONS
| Download Ref No: NSE/FAOP/76748 | Date: October 06, 2026 |
|---|---|
| Circular Ref. No: 137/2026 |
All Members,
Pre-Trade risk controls - Pre-emptive order cancellation on account of NNF ID-Algo ID validations - Update
This is in partial modification to item no. 1.16 G regarding Pre-emptive order cancellation on account of NNF ID-Algo ID validations, of Exchange consolidated circular NSE/FAOP/73928 dated April 28, 2026.
Members are requested to note below additional validations between NNF Id and Algo Id and in case of mismatch, Exchange shall reject such orders:
- If 13^th digit in the NNF ID field contains values as “0, 2, 4 or 5” and first 12 digits of NNF ID are 111111111111, in an order message, then the order will be rejected and the order rejection message will be sent to the NNF user.
- If 13^th digit in the NNF ID field contains values as “0, 2, 4 or 5” and first 12 digits of NNF ID are 333333333333, in an order message, then the order will be rejected and the order rejection message will be sent to the NNF user.
- If 13^th digit in the NNF ID field contains values as “1, 3, 5, 6, 7 or 8” and first 12 digits of NNF ID are 444444444444, in an order message, then the order will be rejected and the order rejection message will be sent to the NNF user.
- If first 12 digits of the NNF ID have value other than 444444444444 and Algo ID field contains value as ‘99999’ in an order message, then the order will be rejected and the order rejection message will be sent to the NNF user.
The identification of 12 digits and 13^th digit of NNF ID are explained in Exchange circular NSE/INVG/73992 dated April 30, 2026.
Members are requested to refer NNF API protocol (FO version 9.51) for the details of the NNF error code and error message. (website link: https://www.nseindia.com/trade/platform-services-neat-trading-system-protocols )
The circular shall be effective from October 12, 2026.
For and on behalf of
National Stock Exchange of India Limited
Khushal Shah
Associate Vice President
| 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
- 06 Oct 2026
- Document number
- NSE/FAOP/76748
- Issuing division
- FUTURES & OPTIONS
- Effective date
- 12 Oct 2026
- Coverage area
- securities