{"id":170687,"date":"2026-08-03T19:48:52","date_gmt":"2026-08-03T14:18:52","guid":{"rendered":"https:\/\/signalz.pro\/?post_type=article&p=170687"},"modified":"2026-08-03T19:48:52","modified_gmt":"2026-08-03T14:18:52","slug":"new-closing-price-rules-for-fo-stocks-complete-sebi-cas-timetable-impact","status":"publish","type":"article","link":"https:\/\/signalz.pro\/article\/new-closing-price-rules-for-fo-stocks-complete-sebi-cas-timetable-impact\/","title":{"rendered":"New Closing Price Rules for F&O Stocks: Complete SEBI CAS Timetable & Impact"},"content":{"rendered":"

New Closing Price Rules for F&O Stocks: Complete SEBI CAS Timetable & Impact<\/b><\/h1>\n

Last updated: August 2026<\/span><\/p>\n

SEBI has introduced a new Closing Auction Session (CAS) to decide the final closing price for F&O stocks. Effective August 3, 2026, regular continuous trading for F&O stocks ends at 3:15 PM instead of 3:30 PM. The final cash closing price is decided through a 20-minute auction, while F&O derivative trading continues until 3:40 PM.<\/span><\/p>\n

Quick Summary: New Market Timings for F&O Stocks<\/b><\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Session \/ Segment<\/b><\/p>\n<\/td>\n

Old Timing<\/b><\/td>\nNew Timing (From Aug 3, 2026)<\/b><\/td>\n\n

What Happens?<\/b><\/p>\n<\/td>\n<\/tr>\n

\n

F&O Cash Regular Trading<\/b><\/p>\n<\/td>\n

9:15 AM -3:30 PM<\/span><\/td>\n9:15 AM -3:15 PM<\/b><\/td>\n\n

Continuous trading stops 15 minutes earlier for F&O stocks.<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Reference Price VWAP<\/b><\/p>\n<\/td>\n

3:00 PM -3:30 PM<\/span><\/td>\n3:00 PM -3:15 PM<\/b><\/td>\n15-minute VWAP sets reference price and \u00b13% price band.<\/span><\/td>\n<\/tr>\n
\n

Closing Auction Session (CAS)<\/b><\/p>\n<\/td>\n

Not Applicable<\/span><\/td>\n3:15 PM -3:35 PM<\/b><\/td>\n\n

Auction pools orders to find one fair closing price.<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Order Entry Session 1<\/b><\/p>\n<\/td>\n

Not Applicable<\/span><\/td>\n3:20 PM -3:25 PM<\/b><\/td>\n\n

Market and Limit orders allowed within \u00b13% band.<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Order Entry Session 2<\/b><\/p>\n<\/td>\n

Not Applicable<\/span><\/td>\n3:25 PM -3:30 PM<\/b><\/td>\n\n

Limit orders only. Closes randomly between 3:28\u20133:30 PM.<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Order Matching & Final Price<\/b><\/p>\n<\/td>\n

Not Applicable<\/span><\/td>\n3:30 PM -3:35 PM<\/b><\/td>\n\n

Orders match at single equilibrium price; close is published.<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

F&O Derivative Contracts<\/b><\/p>\n<\/td>\n

9:15 AM -3:30 PM<\/span><\/td>\n9:15 AM -3:40 PM<\/b><\/td>\n\n

Futures and options trade 10 minutes longer.<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

Post-Close Cash Session<\/b><\/p>\n<\/td>\n

3:40 PM -4:00 PM<\/span><\/td>\n3:50 PM -4:00 PM<\/b><\/td>\nTrades execute only at the official CAS closing price.<\/span><\/td>\n<\/tr>\n
\n

Non-F&O Cash Stocks<\/b><\/p>\n<\/td>\n

9:15 AM -3:30 PM<\/span><\/td>\n9:15 AM -3:30 PM<\/b><\/td>\n\n

No changes. Normal trading continues until 3:30 PM.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

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How Does SEBI’s Closing Auction Session (CAS) Work?<\/b><\/h2>\n

SEBI created CAS to stop last-minute price tricks in the stock market. Earlier, the exchange calculated closing prices using the average price of trades in the last 30 minutes.<\/span><\/p>\n

Now, the exchange collects buy and sell orders into a single pool. It calculates one single price where the highest number of shares can trade.<\/span><\/p>\n

This single price becomes the official closing price for the stock. Non-F&O stocks are not affected by this change yet. You can learn the basics of stock market mechanisms through the<\/span> Signalz Learn Section<\/span><\/a>.<\/span><\/p>\n

What Happens During the CAS Timetable for F&O Stocks?<\/b><\/h2>\n

The last 45 minutes of the trading day follow a strict timetable. Here is how it works step-by-step:<\/span><\/p>\n

3:00 PM to 3:15 PM: Reference Price Calculation<\/b><\/h3>\n

Regular trading continues normally. The exchange calculates the average price of all trades in these 15 minutes. This creates the reference price and sets a \u00b13% price boundary for auction orders.<\/span><\/p>\n

3:15 PM to 3:20 PM: Transition Period<\/b><\/h3>\n

Regular cash trading pauses for F&O stocks. You cannot place or edit orders in this 5-minute pause. Existing limit orders move automatically to the auction book.<\/span><\/p>\n

3:20 PM to 3:25 PM: Order Entry Window 1<\/b><\/h3>\n

You can place, change, or cancel both market orders and limit orders. All orders must stay within \u00b13% of the reference price.<\/span><\/p>\n

3:25 PM to 3:30 PM: Order Entry Window 2<\/b><\/h3>\n

You can only place or edit limit orders. Market orders are locked. To prevent price manipulation, this window closes at a random second between 3:28 PM and 3:30 PM.<\/span><\/p>\n

3:30 PM to 3:35 PM: Order Matching<\/b><\/h3>\n

The exchange matches buy and sell orders at the price with the maximum volume. It publishes the official closing price by 3:35 PM. You can follow live updates on our<\/span> Signalz Feed<\/span><\/a>.<\/span><\/p>\n

Which Orders Are Allowed During the Closing Auction?<\/b><\/h2>\n

Not all order types can enter the auction. Here is a clear list of allowed and blocked orders:<\/span><\/p>\n