The Securities and Exchange Board of India (Sebi) on Thursday revealed modifications to the closing auction session (CAS) structure, introducing adjustments to the settlement methodology, trading timings and the change of unexecuted iceberg orders.
The revised framework will certainly work from December 7, 2026, besides modifications connecting to the shift of unexecuted limitation and iceberg orders from the constant trading session (CTS) to CAS, which will enter into pressure on February 8, 2027
The negotiation price of index derivatives will be based on the volume-weighted standard rates (VWAP) of constituent protections throughout the last 30 mins of the CTS in the equity cash segment.
For expiring stock by-products, removing firms will certainly determine settlement rates using the VWAP of the underlying supply during the last 30 minutes of the CTS across all stock exchanges.
Exchanges will offer the VWAP and amount traded to removing firms and continuously disseminate a sign worths to market individuals in genuine time throughout this period.
Under the modified timings, CAS will certainly operate as a separate 10 -minute session from 3: 30 pm to 3: 40 pm on all trading days. The order-entry duration will certainly close randomly in between 3: 38 pm and 3: 40 pm.
Trading in index derivatives will certainly continue until 3: 45 pm on routine trading days, yet agreements ending that day will quit trading at 3: 30 pm. Trading in supply derivatives will continue up until 3: 45 pm, including on expiry days. The post-close session in the cash sector will run from 3: 50 pm to 4 pm, with trades carried out at the closing costs of protections.
The changes were revealed complying with an appointment paper that had actually obtained over 20, 000 pointers, complied with by deliberations of the marketplace regulatory authority’s Additional Market Advisory Board on Thursday.
The regulator had likewise recommended a combined mechanism, over which numerous market participants had elevated problems, provided the reduced liquidity in the window.
CAS entered effect on August 3 and sparked an outcry from the trading community over the settlement cost, sharp spikes and low liquidity.
Sebi has actually additionally defined exactly how unexecuted orders will certainly move from the continual trading session to CAS. Pending limit orders will usually be continued, other than stop-loss orders and orders priced beyond the relevant CAS rate bands.
Unexecuted iceberg orders within the suitable cost bands will be converted into totally divulged limit orders, unless market individuals pull out when putting the original orders. These transformed orders will have reduced time concern than other limit orders carried forward from the continuous session, yet greater top priority than limitation orders positioned during CAS.
