Pre-Trade risk controls - Pre-emptive order cancellation on account of NNF ID-Algo ID validations - Update

National Stock Exchange of India Limited

Circular

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. 3.6 C regarding Pre-emptive order cancellation on account of NNF ID-Algo ID validations, of Exchange consolidated circular NSE/CMTR/73927 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:

1. 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.
2. 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.
3. 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.
4. 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 (CM version 6.7) 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 November 23, 2026.

For and on behalf of
National Stock Exchange of India Limited

National Stock Exchange of India Limited

Khushal Shah
Associate Vice President