Here’s a fact that surprises people evaluating traders: the presence of a drawdown, by itself, tells you very little. Every honest record has them. The shape of the drawdown — and above all, the behaviour inside it — tells you nearly everything.

Normal pain

A functioning strategy can spend long periods below its previous high. Recovery time matters just as much as the depth of the decline. Moderate drawdowns that arrive during broad market weakness, and are recovered over months without any change in behaviour, are not necessarily a warning sign — that’s what a working process can look like from the inside. If you can’t tolerate watching it, the strategy may simply be a poor fit for your own risk tolerance.

Red-flag pain

The dangerous patterns are specific:

Drawdowns that dwarf the market’s. If the index fell 10% and the trader fell 45%, you’ve learned that the portfolio carries far more downside sensitivity than the headline description may suggest.

Drawdowns with changed behaviour inside them. Position sizes suddenly doubling mid-losing streak is the signature of revenge trading. The drawdown isn’t the danger; the response is.

The smooth curve that cliffs. Months of eerily steady small gains, then one catastrophic candle. That pattern is often consistent with martingale behaviour, hidden short-volatility exposure, or some other form of risk that produces small regular gains in exchange for rare catastrophic losses. The smoothness was the warning.

Recovery by doubling down. A fast V-shaped recovery powered by maximum leverage means the trader got paid for the exact behaviour that should have ended them. It will work until it doesn’t.

A case study from my own record

My public history contains a −78% year — 2018. By the shape test above, it was a red-flag drawdown: oversized relative to the market, and made worse by behaviour inside it. I’m not going to reframe it as bad luck. What you should evaluate is the record since: whether the behaviour changed, and whether it stayed changed. The full story of that year — and why I keep it visible — closes this series.

When you evaluate any trader’s drawdowns, ask the shape questions: Bigger than the market’s? Behaviour change inside it? Smoothness that looks too good? Recovery by escalation? Those four questions filter out most future disasters before they’re yours.

Educational only — my own process and opinions, not investment advice. Past performance is not an indication of future results.