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24-May-2024 17:00

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FAQs on Price Band/ Operating Range Flex 


Exchange defines a price range for each security/contract which is pre-defined percentage of the base price of the security/ contract. The operating range mechanism is implemented in order to prevent erroneous order entry by market participants beyond operating range.  There is no operating range in respect of securities, for which derivative products are available. However in order to prevent members from entering orders at non-genuine prices in such securities based on Pre-trade risk control guidelines, the Exchange has set the dummy circuit (dynamic operating range) filter (operating range) at 10%. 

  1. In case of securities for which derivatives products are available, when the market price or Last Traded Price (LTP) approaches the upper or lower band, Exchange relaxes the operating range.
  2. Once relaxed, the members can place orders in the particular security/contract at prices up to the revised upper or lower band.
  3. Relaxation of the operating range of contract is known as “Flexing”. 

The process of flexing is system driven. In the event of a market trend movement in either direction, the dynamic price band shall be relaxed by 5% at a time in the direction of the price movement during the day in co-ordination with the other Exchange as follows:   

  1. If the dynamic price band of the underlying security has been relaxed OR  
  2. If the last trade in the contract occurs at 9.90% and more of the base price AND
  3. A minimum of 25 trades have been executed with 5 different UCCs on each side of the trade at or above 9.90% or more of the base price.  This process shall be repeated as the price trend moves in the same direction.
  4. In exceptional circumstances, all the Exchanges shall consult and relax the dynamic price band.   

Flexing of price bands/ operating range is undertaken by the Exchange by taking into consideration various factors like movement in underlying price, surveillance actions etc. 

Flexing of price bands/ operating range on members request is applicable for:

1. Options contracts in F&O segment (Index options and Stock options)
2. Options contracts in CD segment
3. SLBM (Borrow / Lend / Recall / Repay). 

Members can place the request for flexing of price bands/ operating range during the normal trading hours of the relevant segment. 

Members can place their request for flexing of price bands/ operating range through any of the following options: 

Mode Details 
Phone 1800 266 00 50 (Option 1) 
Email  msm@nse.co.in 

Members need to provide the following details while placing a request with the Exchange for flexing of price bands/ operating range:- 
For FO & CD: 

Symbol Strike  Type  Expiry  Existing Price  *New Price 
     CE/PE   DD-MMM-YYYY     

For SLB: 

Symbol  Series  Existing price *New Price 

*New Price – Till what price range should be opened.

Upon completion of request for flexing of price band/ operating range, a message is broadcast on the trading system informing members about the same in the following format: 

Segment Message broadcast on Exchange Trading System 
Futures & Options  The revised price range for <instrument> <symbol> <expiry date> <strike> <call/put> : <revised relaxed range> 
Currency Derivatives  The revised price range for OPTCUR <symbol> <expiry date> <strike> CE/PE is: <revised relaxed range> 
Security Lend and Borrowing Market  The UPPER/LOWER price range of the security <security name> <series> <expiry date> in Securities Lending Borrowing Market is being relaxed now from the existing range of <Existing price> to revised range of <revised price> 

The new flexed price band/ operating range is applicable for all members. 

The applicable price bands/ operating range can be viewed in the respective database files for the segment which are provided to members at end of day: 

Segment File name  Nomenclature 
FO contract.gz  Contract.txt 
CD cd_contract.gz  Contract.txt 
SLB security_slb.gz  Security.txt 

If the requested flexing price is already relaxed/flexed or the price is within the range, then in such cases Exchange will not process the flexing request.

Download FAQs on Price Band/ Operating Range flex (.pdf)


“This document/FAQ has been drafted in order to ease Member’s/reader’s understanding of the subject matter. The information and/ or content (collectively ‘Information’) provided herein is general information only and NSE has issued detailed circulars to that effect from time to time, While reasonable care has been exercised to ensure that the Information is adequate and reliable, no representation is made by NSE as to its accuracy or completeness and NSE, its affiliates and subsidiaries accept no liability of whatsoever nature for any direct or consequential loss, including without limitation any loss of profits, arising from reliance on this Information. The readers are expected to undertake their own diligence and are advised not to solely rely on this document. Any such reliance shall be at the reader’s own risk. Nothing stated herein shall bind NSE, in any manner whatsoever.” 

Updated on: 06/01/2023