Turtle Trading strategy
Turtle Trading is the famous 1980s experiment by Richard Dennis and William Eckhardt, who bet they could teach complete beginners — the “Turtles” — to trade profitably with a strict set of mechanical rules. At its core it is a trend-following breakout system: it buys when price breaks out to a new high, rides the trend, and cuts it when the trend turns. It is one of the most studied rule-based strategies ever, which makes it a perfect thing to test honestly rather than take on faith.
An illustration of where the rule triggers — not real prices, and not a signal to act. The dashed forks mean the outcome is undetermined; whether the rule made money is what a backtest measures.
How it works
- • Entry — it goes long when price breaks above the highest high of a lookback window (classically the last 20 days) — a Donchian-channel breakout.
- • Exit — get out when price breaks below the lowest low of a shorter window (classically the last 10 days) — trend-following, so you give back some of the move at the turn.
- • Position sizing — the original Turtles sized by volatility (ATR / “N”), risking a fixed fraction per unit, and pyramided into winners as the trend extended.
- • The idea — capture the rare, large trends that pay for the many small losing breakouts — a few big winners are meant to carry the whole system.
On this site, Turtle Trading is run as the Donchian breakout. See honestly how that approach performed across every famous stock and coin — costs on, no look-ahead, measured against simply buying and holding, with the losses shown.
The honest caveat
The Turtles were genuinely, famously successful in their era — but that is exactly why to be careful. Widely known mechanical edges get competed away, and a breakout system trades in and out, so it pays costs and sits out of the market between trends: in strong, steady bull runs it often lags simply holding, and in choppy markets the breakouts whipsaw. Turtle Trading and the Donchian-channel breakout are the same rule on this site, so the honest test measures them once. On our survivorship-biased set of famous US stocks and ETFs, all 36 could be judged over the roughly five-year window, and the breakout beat simply holding on only 5 and lagged it on 31 — a median excess return of −54.1% versus buy & hold across those names, not a forecast for any one of them. The honest value is finding the specific cases where it did, and never assuming a famous name means a live edge. Test it before you trust it.
Past performance is not a reliable indicator of future results. This is an educational, analytical tool — not investment advice, and not a recommendation to buy or sell anything. You make all decisions and execute on your own broker. This is an educational, analytical tool, not investment advice and not a recommendation to buy, sell or use any strategy. You make all decisions and execute on your own broker.