Defined: NSE extends F&O buying and selling by 10 minutes. What modifications for merchants?
Beginning August 3, 2026, the conventional market closing time for fairness derivatives can be prolonged by 10 minutes to three:40 pm from the present 3:30 pm. Whereas the extension is noteworthy, the larger change lies in how closing costs for eligible securities can be decided.
The transfer goals to make sure a smoother transition between the money and derivatives markets on the finish of the buying and selling day whereas sustaining consistency within the pricing framework throughout segments.
What’s the closing public sale session?
The CAS is a structured buying and selling window held on the finish of the buying and selling day. Throughout this era, market individuals place purchase and promote orders to find out a single closing worth for a safety by an auction-based mechanism.
In contrast to the present system the place costs evolve by regular buying and selling till market shut, the public sale course of discovers a good closing worth based mostly on orders entered throughout the designated session.
In accordance with the alternate, CAS will initially apply solely to securities within the money phase which have spinoff contracts out there. The framework will roll out in phases, and any future growth can be topic to SEBI steering and separate operational directions from the alternate.
Why are derivatives buying and selling hours being prolonged?
Though CAS applies solely to the fairness phase, NSE determined to increase buying and selling hours within the derivatives phase to make sure each markets stay aligned throughout the closing course of.
The alternate additionally clarified that the worth bands and pre-trade danger management measures launched as a part of CAS within the money market can be mirrored within the derivatives phase. That is meant to take care of consistency between the 2 segments throughout the closing section of buying and selling.
How will the closing public sale session work?
The CAS will run for 20 minutes, from 3:15 pm to three:35 pm. The method will start with a transition section between 3:15 pm and three:20 pm, throughout which the reference worth can be calculated utilizing the volume-weighted common worth (VWAP) of trades executed between 3:00 pm and three:15 pm.
Between 3:20 pm and three:25 pm, individuals will be capable of enter each market and restrict orders. From 3:25 pm to three:30 pm, solely restrict orders can be permitted. Throughout this era, market orders can’t be modified or cancelled.
The order entry session will shut randomly at any level between 3:28 pm and three:30 pm, after which the public sale course of will decide the ultimate closing worth.
How will closing costs be calculated?
One key level highlighted by NSE is that there can be no change within the methodology used to calculate closing costs of spinoff contracts. The quantity-weighted common worth (VWAP) used for derivatives closing worth calculation will proceed to be based mostly on trades executed throughout the last half-hour of buying and selling. Nevertheless, as a result of market hours are being prolonged, that 30-minute window will now shift to three:10 pm-3:40 pm as a substitute of the present 3:00 pm-3:30 pm.
For securities eligible for CAS, the closing worth within the money phase can be decided by the public sale course of.
Ashish Nanda, President and Digital Enterprise Head at Kotak Securities summed up the shift by noting that the market is shifting from a “steady buying and selling shut” to an “public sale found shut”.
Beneath the present framework, closing costs are derived from the VWAP of trades executed between 3:00 pm and three:30 pm. Beneath the brand new framework, closing costs for F&O-eligible shares will successfully be linked to a 20-minute public sale course of operating from 3:15 pm to three:35 pm.
What occurs if a inventory is faraway from F&O?
NSE clarified that eligibility for CAS is linked to the presence of derivatives on the inventory. If a safety is excluded from the fairness derivatives phase on each exchanges, it should not be eligible for the CAS.
In such instances, the closing worth will revert to the prevailing methodology and be decided utilizing the VWAP of trades executed over the past half-hour of buying and selling. Nevertheless, if the safety continues to be a part of the derivatives phase on no less than one alternate, it should stay eligible for CAS.
What occurs to pending orders?
The alternate outlined operational modifications referring to order administration. All unexecuted particular orders, together with stop-loss orders and disclosed amount orders, can be cancelled. Pending orders that fall exterior the revised worth band can even be cancelled routinely, and members will obtain acceptable cancellation notifications.
Why does this matter for merchants?
For a lot of market individuals, the largest implication is that the ultimate closing worth could not mirror the final traded worth seen on buying and selling screens at 3:30 pm.
In accordance with Ashish Nanda, this might require changes to buying and selling methods, notably for choice writers and arbitrageurs who rely closely on closing costs for valuation, settlement and hedging selections.
Whereas the derivatives market will stay open till 3:40 pm, the broader shift will not be merely about extending buying and selling by 10 minutes. It marks a change in how closing costs for eligible securities are found, with the alternate shifting towards an auction-based mechanism designed to find out a single closing worth on the finish of the buying and selling day.
What occurs to current market timings?
Aside from the revised closing time, most buying and selling schedules stay unchanged. The pre-open session within the derivatives phase will proceed to start at 9:00 am and the conventional buying and selling session will proceed to begin at 9:15 am. Equally, the commerce modification window will stay unchanged and proceed till 4:15 pm.
(Disclaimer: Suggestions, ideas, views and opinions given by the specialists are their very own. These don’t symbolize the views of The Financial Occasions)
