Copy trading: picking a lead trader and limiting drawdown

1. A “100% win rate” is often survivorship bias

Sorting the board by the highest return or the highest win rate is a common way to pick a trader who is one bad trade from a large loss. Some leads never set a stop and look skilled until one trend runs through the position.

A durable record is small losses and larger wins, with rules that are actually followed. It is not a streak of wins.

2. Four checks

1. Max drawdown: the largest peak-to-trough drop. A history under roughly 15%–20% usually means the risk was cut. It is not a promise about the next drawdown.

2. Time and sample size: a few weeks and a handful of trades are not enough. A record of 30–90 days and 100 or more trades is a more useful sample, still not a forecast.

3. Sharpe ratio: return per unit of volatility. Higher is steadier in the past. It does not predict the next period.

4. Leverage habit: leads who stay in major assets often use modest leverage, commonly under 5x–10x. Check the live positions, not the label.

3. Budget and a per-trade cap

Do not give one lead your whole balance. Split a copy budget across two or three styles, for example one BTC trend trader and one range trader. Turn on a per-order stop so a single copy can close when the loss hits your limit. The stop fills at the market that exists then, not at a guaranteed price.