# BSE advisory explains Closing Auction Session mechanics for F&O traders 2026-08-05T23:12:02+00:00 | Business & Economy | Indian Opinion Desk NDTV Profit reported that BSE issued an advisory urging investors and brokers, particularly those trading futures and options stocks, to understand the Closing Auction Session, a mechanism introduced under a SEBI circular of 16 January 2026 and a BSE circular of 19 January 2026. According to the exchange, the session runs from 3.20 pm and closes at a random time between 3.28 pm and 3.30 pm, accepting both market and limit orders until 3.25 pm and only limit orders after, and sets a single equilibrium price used for index closing values and derivative settlements. BSE said the price affects daily mark-to-market settlement and, on expiry day, whether options finish in, at or out of the money, and asked brokers to display indicative prices and educate clients on the process. ## Indian Opinion Analysis The advisory reads as BSE's own explanation of an existing rule rather than a warning of imminent disruption, since the report does not describe any new rule change or a specific incident prompting it. The mechanics described, order types, timing windows and their effect on settlement, are attributed to BSE's own circular rather than independently verified. Watch for how the session behaves around the next major derivatives expiry. ## Coverage - www.ndtvprofit.com Tags: BSE, SEBI Canonical: https://indianopinion.org/trading-fo-stocks-bse-issues-key-advisory-on-new-closing-auction-rules/ License: Summary and commentary (c) Indian Opinion, reusable with attribution. Facts belong to the linked sources. Cite: https://indianopinion.org/trading-fo-stocks-bse-issues-key-advisory-on-new-closing-auction-rules/#story-in-brief Review state: restored archive article, accurate at time of publication, not offered to search indexes.