Why You Sometimes Can't Sell a Stock in India

Individual stocks have daily price bands of 2%, 5%, 10% or 20%; hit one and trading freezes for the day.

Index-wide circuit breakers halt the whole market at 10%, 15% and 20% moves in Nifty or Sensex.

Trade-to-Trade and ASM/GSM/ESM surveillance can ban intraday and force higher margins or weekly trading.

Surveillance is a red flag, not an endorsement — check the stage before averaging down.