Drawdown: The Risk Number That Describes the Ride
Drawdown is the decline from a peak to the trough that follows it, measured as a percentage of the peak. Maximum drawdown is the largest such decline over a period. Where volatility describes how much something moves on average and beta describes how much it moves with the market, drawdown describes the worst stretch specifically, which is the part people actually experience.
The arithmetic that surprises people
Recovering from a decline requires a larger gain than the decline itself, because the gain is calculated on a smaller base.
- A 10 percent fall needs 11.1 percent to get back.
- A 25 percent fall needs 33.3 percent.
- A 50 percent fall needs 100 percent.
- A 75 percent fall needs 300 percent.
The relationship is not linear and it gets punishing fast. This is the whole reason drawdown is tracked separately from volatility: two holdings with identical average volatility can have very different worst cases, and the worst case is what determines how long recovery takes.
Depth and duration
A drawdown has two dimensions and most discussion only covers the first.
Depth is how far it fell. Duration is how long it took to get back to the previous high, and it is frequently the more consequential of the two. A sharp 30 percent fall recovered inside four months and a slow 30 percent fall that takes six years to recover are the same number and completely different experiences. The second consumes years during which the holding produced nothing while alternatives compounded.
Historical examples make the point without needing any forecast attached: broad US indices have taken multiple years to regain previous highs after their larger declines, and individual stocks have taken considerably longer or never done it at all.
What it does not tell you
Maximum drawdown is a single historical observation, which makes it fragile in a specific way: it describes the worst thing that happened in the window measured, and says nothing about whether that was the worst thing that can happen. A five year maximum drawdown that excludes the last major market decline is measuring a calm period.
It is also backward looking by construction, and it is sensitive to the window chosen. Shifting the start date by six months can change a maximum drawdown figure substantially, which makes cross comparison between sources unreliable unless both use the same window.
And a current drawdown is not a measure of whether something is cheap. A stock 60 percent below its high may have fallen because the business deteriorated by more than 60 percent. The distance from a previous high says nothing about the value of what remains.
Why it belongs next to the other risk measures
Volatility, beta and drawdown are often treated as alternatives and they are not. Volatility averages the movement, which smooths over the worst of it. Beta relates the movement to the market, which says nothing about market wide falls where everything declines together. Drawdown ignores averages entirely and reports the worst run.
Read together they describe different failure modes. A holding with modest volatility and a severe historical drawdown behaves calmly most of the time and badly occasionally, which is a specific risk profile that neither number alone communicates.
Where the reading fits
Price behaviour, including how a stock has moved relative to its own recent range, is one of the dimensions EquityBias reads per covered stock. It sits alongside analyst activity, news sentiment and fundamentals, and no single one of those carries a conclusion on its own.
A stock deep in a drawdown with improving fundamentals and a stock deep in a drawdown with deteriorating fundamentals produce very different pictures across the four dimensions, and the gap between them is reported as divergence rather than averaged away. Every covered stock carries a 30 day score history on its own page, browsable by sector from the coverage directory.
Related: beta for market relative movement, and volume in trading for what participation says about a move.
Market movement is only half the picture
Price behaviour read alongside fundamentals, analyst activity and news, with the disagreements shown rather than averaged.
Track your own stocks free →EquityBias is a market data research tool. Nothing here is financial advice. Historical drawdown describes past price movement and does not indicate future risk or performance.