NSE updates 12-18 October 2026: MWPL margin, closing auction

NSE Clearing will levy a 15% additional exposure margin from 30 October on F&O stocks where the top 10 clients hold over 20% of MWPL. The list is reviewed monthly.

NSE relayed SEBI's revised closing auction session, a 10-minute window from 3:30 pm, and VWAP-based settlement of expiring derivatives. Most changes start on 7 December 2026.

It also circulated SEBI's common advertisement code for intermediaries, amended certification rules for specified persons and RBI's forex derivative curbs, which cut the no-underlying limit from USD 100 million to USD 5 million.

Members must move to the new encrypted message mechanism before 7 December 2026 and add a cautionary pop-up for international ETFs by 16 November. A cyber advisory lists common audit gaps, including MFA and CISO standing.

F&O contracts on six stocks, including City Union Bank and Navin Fluorine, start on 28 October 2026. Polycab leaves F&O after the October 2026 expiry.

Corporate bond RFQ T+0 trading now runs 9 am to 5 pm. NSE also revised its offer for sale operating guidelines and listed 15 T-bills and SDLs from 16 October.

Daily ASM, ST-ASM and ESM lists changed margins on flagged stocks, and CLC Industries moved to GSM Stage IV. Mock trading ran across segments on 17 October with no new version.