Hello Traders,
NSE just announced a major change for the equity derivatives segment starting December 8, 2025. They’re introducing a 15-minute pre-open session for F&O markets, similar to what we’ve had in the equity cash segment for years.
This is significant. It changes how every futures trader will start their day. Here’s everything you need to know.
What’s Changing?
From December 8, F&O markets will have a pre-open session from 9:00 AM to 9:15 AM before the regular trading session begins. Right now, derivatives open directly at 9:15 AM with immediate price discovery happening in those chaotic first few minutes. With pre-open, you’ll get 15 minutes to assess demand-supply and plan your entries before the market actually opens.
How the 15-Minute Pre-Open Works
The session is divided into three distinct phases:
Phase 1: Order Entry Period (9:00 AM – 9:08 AM) During these 8 minutes, you can place, modify, or cancel orders. Both limit orders and market orders are allowed. You’ll see real-time indicative prices, equilibrium data, and demand-supply statistics as orders come in. This gives you visibility into where the market wants to open.
Important: A random closure will occur between the 7th and 8th minute. The system will randomly pick a moment to stop accepting new orders. This prevents last-second order flooding and ensures fair price discovery.
Phase 2: Order Matching Period (9:08 AM – 9:12 AM) After the order entry period ends, the system calculates a single equilibrium price based on all the orders placed. This becomes the opening price for that contract. All matched orders execute at this one price. During this phase, you cannot modify or cancel orders.
Phase 3: Buffer Period (9:12 AM – 9:15 AM) This is a transition period between pre-open and continuous trading. At 9:15 AM, normal trading begins as usual.
Which Contracts Are Eligible?
Pre-open applies to:
- Current month futures on indices (Nifty, Bank Nifty, Fin Nifty, etc.)
- Current month futures on individual stocks
- In the last 5 trading days before expiry, next month futures will also be included
Pre-open does NOT apply to:
- Options contracts (both index and stock options)
- Far month (M3) futures contracts
- Spread contracts
- Futures on ex-dates due to corporate actions
So if you trade Nifty futures or stock futures like Reliance, HDFC Bank, etc., this applies to you. If you’re an options trader, you’ll still face the direct 9:15 AM open without pre-open.
Mark your calendars. From December 8, your F&O trading routine changes. You’ll need to be at your screens by 9:00 AM if you want to participate in pre-open and see the opening price formation happen in real-time.