The transfer comes after the rollout of the Closing Public sale Session, or CAS, within the fairness money section from early August this 12 months. Underneath the framework launched by means of Sebi’s January 16 round, the closing value found by means of CAS can be used as the premise for settlement costs of spinoff contracts on expiry.
The assessment follows sharp expiry-day strikes seen after the introduction of CAS. Merchants have complained that sudden swings within the closing public sale can result in massive modifications in possibility costs within the closing minutes of commerce, particularly when contracts are near expiry.
On Thursday, Sensex moved from round 76,510 at 3:17 pm to about 74,373 at 3:20 pm, triggering a pointy spike in put choices. The 76,600 put possibility jumped from Rs 102 to Rs 446, whereas the 76,400 put surged from Rs 45 to Rs 246. Such strikes deepened issues over how CAS costs feed into spinoff settlement.
CAS was launched to find out the closing value of securities within the fairness money section. The mechanism is supposed to enhance closing value discovery by gathering purchase and promote orders in the course of the public sale window. Nevertheless, using the identical CAS-discovered closing value for spinoff settlement has created issues as a result of derivatives positions might be a lot bigger and extra leveraged than cash-market trades.
Sebi stated it has carefully monitored the functioning of CAS and its market impression in the course of the first month of operation. The regulator additionally stated it obtained suggestions and options from market contributors by means of a number of channels, together with social media and different media platforms.
A key space of suggestions associated to using CAS-determined closing costs for settling spinoff contracts on expiry. This has turn into a delicate challenge for merchants as a result of even a pointy motion within the cash-market closing value can change the worth of expiring index choices and futures.Sebi stated the CAS framework was launched after detailed consultations and coverage deliberations. The regulator stated two rounds of public session have been held in December 2024 and August 2025, together with discussions in advisory committees and with inventory exchanges, dealer associations, institutional buyers and different stakeholders.
After CAS was applied, Sebi stated it continued to have interaction with inventory exchanges, brokers, proprietary merchants, software program distributors, mutual funds, trade associations and overseas portfolio buyers to assist clean implementation and tackle operational points in the course of the preliminary adoption interval.
The regulator didn’t specify what modifications could also be proposed. The session paper anticipated subsequent week will probably be watched carefully by brokers, proprietary desks, institutional buyers and energetic derivatives merchants.
Any change in methodology might be essential for expiry-day threat administration. If the settlement value is much less instantly linked to short-period CAS actions, it might cut back the possibility of sudden possibility value spikes within the closing minutes.
