Peak-to-trough drawdown measures the decline from a portfolio's previous high point to a subsequent low before a new peak is reached. It is one of the most practical ways to describe the severity of a historical loss.

How Drawdown Works

Suppose a portfolio rises from £100,000 to £120,000 and later falls to £90,000 before recovering. The peak-to-trough drawdown is £30,000, or 25% of the £120,000 peak.

Why Drawdown Matters

Annual returns can hide the path an investor had to endure. Two portfolios may produce similar long-term returns while experiencing very different losses along the way. Drawdown makes that path visible.

Maximum Drawdown

Maximum drawdown is the largest peak-to-trough decline recorded over a chosen period. Investors can compare maximum drawdown across strategies to understand how severe the worst historical loss has been.

Drawdown and Recovery

Losses become harder to recover from as they increase. A 10% decline requires an 11.1% gain to return to the starting value, while a 50% decline requires a 100% gain. This is why downside control matters for compounding.

How Investors Can Use It

Look at drawdown alongside return, volatility, Sharpe ratio and benchmark performance. Also consider how long recovery took. A moderate loss that recovered quickly can have a different practical impact from a smaller loss that lasted for years.

Portfolio-Level Drawdown

Individual holdings can have large drawdowns without necessarily creating the same loss at portfolio level. Diversification, position size and correlation all influence how security-level declines translate into total portfolio outcomes.

Managing Drawdown Risk

• Use sensible position sizes.
• Avoid excessive concentration.
• Understand correlations during stress.
• Maintain liquidity for planned withdrawals.
• Review portfolio exposures when risk changes materially.

FAQ

Is drawdown the same as volatility?

No. Volatility measures fluctuations in returns, while drawdown measures the decline from a previous peak.

Should every investor minimise drawdown?

The appropriate level depends on objectives, time horizon and risk tolerance. Drawdown is a measurement that helps investors make that trade-off explicit.

Conclusion

Peak-to-trough drawdown turns a vague idea of "risk" into a tangible measure of loss. Used with return, volatility and recovery time, it gives investors a clearer understanding of how a strategy may behave through difficult periods.