Normal trading ends at 3:15 PM, CAS runs until 3:35 PM, and the post-close session is 3:50 PM–4:00 PM.  

Important: CAS will initially apply only to cash-market stocks for which derivative contracts are available. Other stocks will continue with the existing last-30-minute VWAP method.  

Understand CAS Trading Timings: Know the complete CAS timeline, including normal trading, auction periods, order restrictions, closing price determination, and the post-close session.