F&O Margin and Lot Size Explained: SPAN & Exposure
September 4, 2026
TABLE OF CONTENTS

Stock market timings in India refer to the official hours set by NSE and BSE for equity trading, running from 9:15 AM to 3:30 PM, Monday to Friday. This is preceded by a pre-opening session from 9:00 AM to 9:15 AM and followed by a post-closing session from 3:30 PM to 4:00 PM, with other segments like currency derivatives and commodities following separate, longer trading windows.
Equity normal trading: 9:15 AM to 3:30 PM, Monday to Friday
Pre-opening session: 9:00 AM to 9:15 AM for price discovery
Currency derivatives trade until 5:00 PM; commodities until 11:30 PM (or 11:55 PM during US daylight saving)
After Market Orders (AMO) can be placed roughly 3:45 PM to 8:57 AM the next day for NSE equity
Markets stay closed on Saturdays, Sundays, and official exchange holidays
Data source: NSE India, BSE India official trading session circulars
| Segment | Trading Hours | Days |
|---|---|---|
| Equity Pre-Opening | 9:00 AM - 9:15 AM | Mon-Fri |
| Equity Normal Trading | 9:15 AM - 3:30 PM | Mon-Fri |
| Equity Post-Closing | 3:30 PM - 4:00 PM | Mon-Fri |
| After Market Orders (AMO), NSE | 3:45 PM - 8:57 AM | Mon-Sat |
| Currency Derivatives | 9:00 AM - 5:00 PM | Mon-Fri |
| Commodity (Morning) | 9:00 AM - 5:00 PM | Mon-Fri |
| Commodity (Evening) | 5:00 PM - 11:30 PM | Mon-Fri |
| Derivatives (F&O) | 9:15 AM - 3:30 PM | Mon-Fri |
| Block Deals | 8:45 AM - 9:00 AM, 2:05 PM - 2:20 PM | Mon-Fri |
| IPO Listing | 10:00 AM onwards | Mon-Fri |
| Muhurat Trading | Evening, timing varies | Diwali |
The Indian stock market is open for equity trading from 9:15 AM to 3:30 PM, Monday to Friday. This is the primary window for buying and selling shares of listed companies on the NSE and BSE.
A common point of confusion for beginners is assuming the market starts at 9:00 AM. That's actually the pre-opening session, not the main trading window; regular trading begins at 9:15 AM sharp.
The market stays closed on Saturdays, Sundays, and official exchange holidays, with the exception of special sessions like Muhurat Trading on Diwali.
Each trading day is divided into distinct sessions, each serving a specific function.
This 15-minute window before regular trading plays a key role in price discovery, split into three parts.
Order Entry Period (9:00 AM - 9:08 AM): Orders can be placed, modified, or cancelled during this window. No trades execute yet; this is purely the order collection phase.
Order Matching Period (9:08 AM - 9:12 AM): The exchange matches buy and sell orders to determine the opening price. No modifications or cancellations are allowed during this window, and the system applies a matching algorithm to find the price at which maximum volume can trade.
Buffer Period (9:12 AM - 9:15 AM): Orders placed during this short window get queued and executed once regular trading begins at 9:15 AM, helping avoid abrupt price swings right at the open.
This entire pre-opening structure exists to reduce opening-price volatility and support fair price discovery, limiting the scope for manipulation at market open.
This is when the bulk of buying and selling activity happens, running for 6 hours and 15 minutes with orders executed continuously based on price and time priority.
A market order executes immediately at the best available price. A limit order sits in the order book until the specified price is matched. Understanding what is intraday trading helps in deciding how actively to trade within this window versus holding for the longer term.
The market doesn't shut down entirely at 3:30 PM. A 30-minute post-closing session follows, split into two parts.
Closing Price Calculation (3:30 PM - 3:40 PM): The exchange calculates the official closing price using the weighted average price from this 10-minute window, which then sets the reference for the next day's circuit limits.
Post-Market Orders (3:40 PM - 4:00 PM): Orders can be placed at the fixed closing price during this window, useful for anyone wanting to enter or exit at the day's official closing rate without worrying about last-minute price swings.
AMO lets traders place orders when the exchange itself isn't open, a genuinely useful feature for anyone who can't watch the market during working hours.
For NSE equity, AMO orders can generally be placed between 3:45 PM and 8:57 AM the next trading day, though the exact window can vary slightly by broker. The table below shows how this differs across a few major platforms.
| Broker | Equity AMO Window (NSE) |
|---|---|
| Zerodha | 3:45 PM - 8:57 AM |
| Most brokers | 3:45 PM - 9:00 AM (approx.) |
AMO orders queued overnight get sent to the exchange around 9:00 AM and execute during the pre-opening or regular session, depending on order type. It's worth noting that AMO orders fill at the market price during the opening session, which can differ meaningfully from the previous day's closing price, so the executed price isn't guaranteed to match what was expected when the order was placed.
Beyond equity, several other market segments run on their own schedules.
Currency pairs like USD/INR and EUR/INR trade from 9:00 AM to 5:00 PM, two hours longer than the equity segment. This extended window helps traders respond to global currency movements that unfold throughout the day. Understanding the difference between equity vs commodity segments clarifies why these markets run on different schedules.
Commodity trading runs the longest hours of any segment.
Morning Session: 9:00 AM to 5:00 PM, same as currency derivatives.
Evening Session: 5:00 PM to 11:30 PM, extended to 11:55 PM during US daylight saving time.
This evening session lets traders react to global commodity price movements as they happen. One important distinction: agricultural commodities like wheat, soybean, and cotton trade only during the morning session (9:00 AM to 5:00 PM), while the evening session is reserved for non-agricultural commodities such as gold, silver, and crude oil.
Futures and options trade during the same hours as equity, 9:15 AM to 3:30 PM, with identical pre-opening, normal, and post-closing sessions. Given how time-sensitive derivatives positions are, particularly in the final trading hour, understanding options vs stocks and share market expiry days matters for anyone actively trading F&O.
A few exceptions to the regular schedule are worth knowing.
Muhurat Trading is a symbolic one-hour session held on Diwali evening, typically between roughly 6:00 PM and 7:15 PM, though the exact timing shifts each year based on the auspicious muhurat. Many investors treat this session as culturally significant for new investments rather than a purely strategic trading window. See the dedicated guide on Diwali Muhurat trading timings for the exact 2026 schedule once announced.
Block deals are privately negotiated transactions involving large share quantities, conducted during two specific windows outside regular hours: 8:45 AM to 9:00 AM, and 2:05 PM to 2:20 PM. These windows exist specifically so large transactions don't distort regular market prices. Block deals are generally the domain of institutional investors rather than retail traders; understanding FII and DII activity explains who typically participates.
Newly listed IPO stocks don't begin trading at the usual 9:15 AM; instead, trading starts at 10:00 AM on listing day. This one-hour delay gives the exchange time to finalize listing procedures and introduce the new stock in a more controlled manner. Learn more about what is IPO and how to increase IPO allotment chances for more on the listing process.
Markets stay closed on weekends and official public holidays, including festivals like Holi, Diwali, Independence Day, and Republic Day. To check whether the market is open on a specific date, the official NSE or BSE holiday calendar, published at the start of each year, is the most reliable source. The complete NSE holidays guide covers the full 2026 calendar in detail.
Timing within the trading day matters as much as knowing the overall session hours.
Volatility peaks during this window as overnight news, global market movements, and pending orders all get absorbed at once. Some traders use the first hour to observe rather than act, waiting for prices to stabilize before entering positions, while more experienced traders specifically look for opportunities in this volatility. Understanding India VIX helps gauge how elevated volatility is on any given day.
Trading activity typically slows during these hours, with lower volume and less dramatic price movement. This window tends to suit more calculated, less reactive trading decisions.
Activity picks up again as institutional players position ahead of the close and day traders square off intraday positions. There's an informal "90% rule" among some traders, the idea that a large share of a stock's daily price movement happens in the first and last trading hour. It isn't a scientifically established rule, but it does reflect how significant these windows tend to be.
Dhanarthi's screener directly, can help filter stocks by technical and fundamental parameters, which becomes particularly useful during these higher-volatility windows. Pairing timing awareness with fundamental analysis vs technical analysis tends to produce steadier decision-making than timing alone, and understanding support and resistance in trading helps identify meaningful price levels within these windows.
Knowing the exact stock market timings in India, 9:15 AM to 3:30 PM for equity, alongside the pre-opening, post-closing, and after-market order sessions, is a foundational step for any trader or investor. Other segments like currency derivatives and commodities run on longer schedules, and special sessions like Muhurat Trading add a cultural dimension to the calendar.
Markets stay closed on weekends and official holidays, so keeping the exchange calendar handy avoids last-minute surprises. For anyone with a full-time job unable to watch the market during trading hours, AMO remains the most practical way to place orders outside the regular window. The guide on what is a stockbroker can help in choosing the right platform for placing AMO orders reliably, and Dhanarthi's financial analysis tools can help review a stock's fundamentals before entering a position around any of these session windows.
Disclaimer: This article is for educational purposes only and does not constitute investment advice. Dhanarthi is not a SEBI-registered investment advisor or research analyst. Trading hours and session timings are based on official NSE and BSE circulars as of July 2026 and are subject to change; always verify current timings on the official exchange website or your broker's platform before placing time-sensitive orders.
1. What are the stock market timings in India for equity trading?
Stock market timings in India for equity are 9:15 AM to 3:30 PM, Monday to Friday. A pre-opening session runs from 9:00 AM to 9:15 AM, and a post-closing session runs from 3:30 PM to 4:00 PM for specific order types and closing price calculations.
2. Is the stock market open on Saturday and Sunday in India?
No, the share market stays closed on Saturdays and Sundays. Trading happens only on weekdays, except during official exchange holidays announced in the annual holiday calendar.
3. What is the share market open time during weekdays?
Normal trading begins at 9:15 AM. The pre-opening session starts earlier, at 9:00 AM, where orders can be placed ahead of the official market open.
4. Can I buy shares after 3:30 PM when the market closes?
Yes, using After Market Orders (AMO). For NSE equity, AMO orders can generally be placed between 3:45 PM and 8:57 AM the next trading day, executing when the market opens.
5. What are the NSE trading hours for derivatives (F&O)?
F&O trading hours match equity: 9:15 AM to 3:30 PM, with identical pre-opening, normal trading, and post-closing sessions.
6. Can I trade on Saturday in India in any market segment?
No, all segments, equity, derivatives, currency, and commodity, stay closed on weekends. AMO orders can be placed on Saturday, but they execute only on the next trading day.
7. What is the 10 AM rule in stock trading?
The 10 AM rule refers to avoiding trades in the first 45 minutes (9:15 AM to 10:00 AM) due to elevated volatility, waiting instead for prices to stabilize before entering positions.
8. When does the stock market close in India for commodity trading?
Non-agricultural commodities close at 11:30 PM (or 11:55 PM during US daylight saving time). Agricultural commodities close earlier, at 5:00 PM. Equity and derivatives close at 3:30 PM.
9. What are the trading hours for currency derivatives?
Currency derivatives trade from 9:00 AM to 5:00 PM on weekdays, two hours longer than equity trading, to accommodate global currency movement throughout the day.
10. What is the purpose of the pre-opening session?
The pre-opening session (9:00 AM to 9:15 AM) supports price discovery and reduces opening volatility by matching buy and sell orders before regular trading begins.
11. How does the post-closing session work?
The post-closing session runs from 3:30 PM to 4:00 PM. The closing price is calculated first (3:30 PM to 3:40 PM), then post-market orders are accepted (3:40 PM to 4:00 PM) at that calculated price.
12. What is Muhurat Trading and when does it happen?
Muhurat Trading is a special one-hour session held on Diwali evening, typically between 6:00 PM and 7:15 PM, considered culturally significant for symbolic new investments, with the exact timing varying each year.
13. What is the 90% rule related to stock market timing?
The 90% rule is an informal observation that a large portion of a stock's daily price movement happens during the first and last trading hours. It isn't a scientifically proven rule, but it reflects the significance of these windows for active traders.
14. Are NSE and BSE trading hours the same?
Yes, NSE and BSE follow identical equity trading hours: 9:15 AM to 3:30 PM, with matching pre-opening and post-closing sessions.
15. Where can I check today's exact market status?
The official NSE or BSE website displays real-time market status, and most broker apps show a live indicator of whether the market is currently open, closed, or in a pre-opening session.
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