Stop Loss

A stop-loss order is an instruction to your broker to automatically sell (or buy, for short positions) a security when its price reaches a predetermined level. It is the most fundamental risk management tool in trading — the mechanism that converts "I'll cut my losses" from a vague intention into an enforceable action.

On NSE/BSE, stop-loss orders come in two variants: SL (Stop-Loss Limit) and SL-M (Stop-Loss Market). An SL order has both a trigger price and a limit price — when the trigger is hit, a limit order is placed at your specified price. An SL-M order has only a trigger price — when hit, a market order is executed at the best available price. SL-M ensures execution but at potentially worse prices; SL ensures price but risks non-execution if the stock gaps past your limit.

Proper stop-loss placement requires analysis, not arbitrary round numbers. Traders place stops below Support levels for long positions or above Resistance for short positions. A stop placed too tight gets triggered by normal market noise (whipsaws); too wide defeats the purpose of loss limitation. A common approach is to place stops 1-2 ATR (Average True Range) below the entry for swing trades.

Consider a practical example: you buy Reliance Industries at INR 2,500 based on a breakout above resistance. Your analysis shows support at INR 2,420. You place an SL order with trigger at INR 2,415 and limit at INR 2,410. If Reliance drops to INR 2,415, the trigger fires and your shares are offered at INR 2,410, limiting your loss to approximately INR 90 per share (3.6% of entry).

Stop-loss discipline separates successful traders from the rest. The most common mistake is moving the stop loss further away when a trade goes against you — "giving it room" is usually giving it room to cause a bigger loss. Professional traders set their stops before entering the trade, based on the Risk-Reward Ratio, and do not move them further from the entry price under any circumstances.