Exit Strategy — Setting Target and Stop-Loss Prices

What is an Exit Strategy?

An exit strategy is a set of rules defined before buying a stock, specifying at what price and under what conditions to sell a holding. Its core consists of two elements: a target price for realizing profits and a stop-loss price for limiting losses. The most crucial aspect is to define these *before* buying, not after.

Due to loss aversion, people tend to hold onto losing positions, hoping to sell 'once it breaks even'. In profitable situations, they tend to delay selling, thinking 'it will go up further'. When these two biases combine, they lead to the opposite of desired behavior: letting losses grow while cutting profits short. Writing down your rules beforehand can reduce emotional interference at the moment of trading.

This article is an educational resource covering the principles of designing selling rules, and does not recommend buying or selling any specific stock.

Two Ways to Set a Stop-Loss Price

Stop-loss prices are generally set using two main methods: percentage-based and volatility-based. The percentage-based method is simple. If you buy a stock at $100 and set a stop-loss percentage of 8%, your stop-loss price is $92. If the price falls below this level, you sell without questioning the reason.

The volatility-based method accounts for the fact that different stocks have different price fluctuations. If you set an 8% stop-loss on a stock that typically experiences large daily swings, you might be stopped out by normal volatility. Therefore, some investors use 1.5 to 2 times a volatility indicator like ATR (Average True Range) as their stop-loss range. For highly volatile stocks, the key is to widen the stop-loss range but reduce the number of shares purchased to keep the potential loss amount consistent.

Regardless of the method, the stop-loss price should be set immediately after buying the stock. If you lower the stop-loss line, thinking 'let's just wait a little longer' after the price approaches it, your rule is broken.

Designing Target Prices and Risk-Reward Ratios

A target price is not based on vague expectations, but rather on its relationship with the stop-loss price. The ratio of the distance to the stop-loss (risk) and the distance to the target price (reward) is called the risk-reward ratio. If the purchase price is $100, the stop-loss price is $90, and the target price is $130, the risk is $10 and the reward is $30, making the risk-reward ratio 1:3.

The risk-reward ratio is important because it directly relates to your win rate. If your risk-reward ratio is 1:2, you only need to win 4 out of 10 trades to mathematically break even or profit. This means you don't need to be right every time, which provides a psychological basis for accepting stop-losses more easily.

The target price itself gains credibility when supported by valuation. For example, if a stock has an EPS of $10 and the industry average P/E ratio is 15x, the fair value might be estimated at $150. However, such estimations are sensitive to assumptions and should be treated as a reference point, not a definitive value.

Trailing Stops and Partial Selling

Selling all shares at the target price in one go is not the only approach. A trailing stop protects profits by moving the stop-loss line up as the stock price rises. If a stock purchased at $100 rises to $130, you could raise the stop-loss line to $120, securing a minimum profit while allowing for further upside.

Partial selling involves dividing the target price into several zones and selling portions of your holdings at each. For example, selling 1/3 at $120, another 1/3 at $140, and managing the rest with a trailing stop can reduce both the regret of selling too early and the regret of holding on for too long. This strategy helps diversify the risk of putting all your eggs in one decision.

Compared to the US market, some brokerage firms in the Korean market offer limited support for automatic trailing stop orders. Therefore, investors often rely on alerts to manually manage their positions. It's advisable to check in advance what types of orders are available in your trading environment.

Common Pitfalls and Limitations

The most common mistake is setting the stop-loss line too tightly. If the stop-loss range is narrower than the stock's volatility, you'll repeatedly be stopped out by normal fluctuations, accumulating only fees and losses. Conversely, indefinitely delaying a stop-loss can turn a small loss into an irrecoverable large one.

Moving your stop-loss or target price after the market price approaches them is effectively abandoning your rules. Specifically, 'averaging down' by continuously buying more of a declining stock to lower your average purchase price directly conflicts with stop-loss rules, so you must critically assess whether your original investment thesis remains valid.

An exit strategy is not a tool to eliminate losses, but rather a tool to control their size. There are instances, such as gap downs, where the price can open below your stop-loss, leading to execution at a lower price. Therefore, you must assume that even with rules in place, losses can sometimes be larger than anticipated.

Checkpoints

Before pressing the buy button, write down three things. First, your stop-loss price; second, your target price; and third, the risk-reward ratio calculated from those two. If the risk-reward ratio is less than 1:1, reconsider entering the trade.

Do not change your established rules on the spot just because the price approaches them. A stop-loss is not an admission of failure, but rather a preservation of capital for the next opportunity. Consistently following your rules, rather than relying on single successful trades, determines long-term performance. This content is general information for educational purposes only and not investment advice.