What is a special pre-open session? For which stocks is the special pre-open session applicable?

---

Special pre-open session is a short window in the stock market before normal trading starts. Only Limit orders are accepted in the special pre-open session. 

The special pre-open session is applicable to the below type of securities:

• IPOs/SME-IPOs on their first day of trading.
• Re-listed securities—i.e., when trading resumes after delisting or suspension.
• Stocks undergoing corporate restructuring (merger, demerger, amalgamation, capital reduction/consolidation, or other schemes of arrangement as per law) on the “ex-date” of restructuring.

Market timings of special pre-open sessions are as follows:

Session Stage	Time Window	Notes
Order Entry / Modification / Cancellation	09:00 AM – 09:45 AM	Random closure any time between 09:35 and 09:45 AM
Order Matching & Equilibrium Price Discovery	Immediately after random close (~09:45 AM – 09:55 AM)	System calculates opening price and matches orders
Buffer Period (Transition)	09:55 AM – 10:00 AM	Used to stabilise and move to the normal market
Normal Market Opening	10:00 AM	Regular trading begins