Self-trade prevention and its effect on cover orders

Sun, 21 Jun 2026 00:00:00 +0000

NSE’s self-trade prevention check (STPC) is an exchange-level control that cancels one of two orders entered under the same PAN when they would otherwise match against each other in the same scrip. Because a buy and a sell from the same beneficial owner crossing in the order book produce no change in ownership, the trade would be a self-trade, also called a wash trade. The exchange blocks it by cancelling either the incoming order or the resting one. A cover order (CO) is affected like any other order: if its entry leg or its mandatory stop-loss leg would match another of your own pending orders in that instrument, one of the two is cancelled, which can quietly remove the stop you were relying on.

Wash Trade on WebNotes

Self-trade prevention and its effect on cover orders