Short answer

The exchange conducts a mock trading session on one Saturday each month. This allows brokers to test their trading infrastructure, new products/systems, and run contingency drills. You will see live ticks on Arrow during these sessions.

Impact on your account display

Your holdings and position values display according to mock-trading prices. This might result in incorrect prices on the Marketwatch and potentially inaccurate positions or holdings values. However, at the end of the session, Friday’s closing prices will be updated.

You can check the mock trading calendar on NSE’s and MCX’s websites.