Starting today, the pre-open session for IPOs and stocks relisting on the exchanges will close randomly in the last 10 minutes of the session. Earlier, the pre-open session used to close randomly in the last minute.

What does this mean?

Normally, the pre-open session is held from 9:00 AM to 9:08 AM with trading starting from 9:15 AM.

However, when a stock is listing on the exchanges. A special pre-open session is held from 9:00 AM to 9:45 AM to determine the opening price.

Between 9:00 AM to 9:45 AM, investors can place, modify, and cancel the orders. The order matching happens at the end of the session and normal trading resumes from 10 AM. Learn more.

Why the changes in pre-open session closing timings?

During the pre-open session for certain IPOs and relisted stocks, large orders are often placed at high prices but canceled just before the session ends.

This can create false demand and manipulate stock prices, which harms regular investors. To avoid such cases, the pre-open session will now be closed randomly during the last 10 minutes (between the 35th and 45th minute).