Why Traders Must Know Equity High Watermark and How to Use It to Prevent Excessive Risk

Many traders focus on daily profit increases but overlook an important indicator that shows the true state of their portfolio: Equity High Watermark, or the highest portfolio value ever achieved. Understanding and tracking this metric helps traders control emotions, manage risk, and prevent excessive risk-taking after making good profits or suffering significant losses.

What Is Equity High Watermark

Equity High Watermark is the highest portfolio value your trading account has ever reached. For example, if you start with 100,000 baht capital and make profits until your portfolio value rises to 150,000 baht, that 150,000 baht figure is your High Watermark. If you then suffer losses and your portfolio value drops to 140,000 baht, the High Watermark remains at 150,000 baht until you make profits that exceed that level.

This metric is important because it serves as a "reference line" that shows where our portfolio stands compared to the best point we've ever achieved, and helps traders recognise the duration and magnitude of drawdowns that occur from that peak.

Why High Watermark Matters for Risk Management

Many people think that as long as they're still profitable above their starting capital, they're trading well. But in reality, tracking the High Watermark gives us a clearer picture, because it tells us whether we're in a drawdown period and, if so, how we should adjust our trading approach.

Preventing Excessive Risk After Making Profits

A common problem is that after traders make good profits and their portfolio value reaches a new peak, they often become overconfident and start increasing lot sizes or opening positions more frequently, thinking "I've made good profits now, a bit more risk won't hurt." But this is the beginning of a major problem.

When you know your portfolio is at a High Watermark, you should be more cautious, not more reckless. Because excessive risk-taking at this point may lead you into a prolonged and severe drawdown. Using proper lot sizing and maintaining trading discipline will help protect your High Watermark.

Measuring the True Performance of Your Trading System

High Watermark also helps you measure your trading system's performance objectively. If your portfolio consistently makes new High Watermarks, it shows your trading system is working well. But if your portfolio remains below the previous High Watermark for an extended period, it indicates something is wrong—perhaps a deteriorating trading system or lax risk management.

Tracking your Equity Curve alongside your High Watermark will give you an even clearer overall picture of your portfolio.

How to Use High Watermark in Real Trading

Set Criteria for Reducing Lot Size When Falling from High Watermark

The key principle is: when your portfolio falls from the High Watermark by more than a set percentage, you should reduce your lot size. For example, if you decide that when your portfolio falls 10% from the High Watermark you'll reduce lot size by 30%, and if it falls 20% you'll reduce lot size by another 30%.

This method helps ensure you don't trade too heavily during periods when your portfolio is weak, and reduces the risk of Psychological Drawdown that could destroy your mental state before your capital runs out.

Record High Watermark and Time Spent Below That Point

Keeping records of what your High Watermark is and how long it takes you to reach a new High Watermark is valuable data. If you find you're taking too long to return to your peak, it may mean you need to improve your trading system or risk management approach.

Using a platform like Thaifxbook that tracks statistics from real MT5 trading accounts will help you see High Watermark and Equity Peak data clearly without having to calculate it yourself.

Use It as a Criterion for Profit Withdrawal

Many professional traders use High Watermark as a criterion for withdrawing profits. For example, every time their portfolio reaches a new High Watermark, they withdraw a portion of the profits, such as 20-30% of the gains above the previous level. This method helps you lock in actual profits and reduces the risk of losing all your gains if a major drawdown occurs.

Common Mistakes Traders Make Regarding High Watermark

Not Tracking High Watermark at All

Many traders don't track this figure at all. They only look at whether they made a profit or loss today, but don't know where their portfolio stands compared to the highest point they've ever achieved. Not knowing this figure prevents them from adjusting their strategy in time when their portfolio starts falling from its peak.

Being Too Attached to Old High Watermark

Conversely, some people become too attached to their old High Watermark and feel discouraged or pressured every time their portfolio is below that point. It's important to understand that drawdown is an unavoidable part of trading. Having good trading psychology will help you not stress too much about this figure.

Increasing Risk to Chase High Watermark

When their portfolio falls from the High Watermark, some traders try to increase lot size or trade more frequently to get back to the peak as quickly as possible. But this is a dangerous trap. Increasing risk during a period when your portfolio is weak usually makes the drawdown deeper rather than leading to recovery.

The correct approach is to maintain discipline, use an appropriate Risk-Reward Ratio, and patiently wait for your trading system to work until your portfolio gradually recovers to a new High Watermark sustainably.

Conclusion

Equity High Watermark is a metric every trader should track, because it helps you know the state of your portfolio compared to the best point you've ever achieved. Learning to use High Watermark to set criteria for reducing lot size, withdrawing profits, and evaluating trading system performance will help you prevent excessive risk and generate sustainable long-term profits. Using tools that help track these statistics transparently and accurately will make you a more disciplined and professional trader.