In the world of trading, few stories are as famous as the one behind the Turtle Traders. 

The Turtle experiment was simple in concept — could absolute beginners, given nothing but a set of rules and two weeks of training, beat the markets?

The results of the experiment were extraordinary. 

Even today, four decades later, many of their principles still echo through our algorithm-dominated trading world.

In this article, we’ll revisit the original Turtle strategy, examine how it worked, and explore how this legendary approach could be reimagined for modern traders.

Who Were the Turtles?

The Turtle Traders were the product of a famous bet between trading legend Richard Dennis and his partner William Eckhardt. Dennis believed that trading could be taught; Eckhardt thought that the ability to trade was a set of skills that you are born with. 

To settle the debate, Dennis placed an ad in the newspaper and selected a group of everyday individuals, none of whom had any prior trading experience.

These recruits underwent a two-week crash course in trading, during which they were taught a complete, mechanical system. It was based on trend-following logic, relying on breakouts, strict entry and exit rules, and position sizing based on market volatility. 

The idea was simple — eliminate emotion, follow the rules, and let the trends do the work.

The experiment was a runaway success. As a group, the Turtles reportedly achieved an average annual return of 80%, managing millions in capital and building one of the most talked-about trading systems in history.

Turtle Trading Rules and Instruments

Entry Rules: 

The Turtles followed mechanical entry rules based on the concept of trading with the trend. 

The initial entry criteria were:

1. Enter a long position if the price breaks above the 20-day high.
2. Enter a short position if the price falls below the 20-day low.
3. For a more conservative approach, a second strategy of a 55-day breakout was used as an alternative.
4. Orders were placed using buy/sell stop orders triggered by the breakout.

Markets Traded:

The system was applied across a wide range of liquid futures markets:

• Currency Futures: EUR/USD, JPY/USD, GBP/USD, CHF/USD, CAD/USD
• Commodity Futures: Gold, Silver, Crude Oil, Heating Oil, Corn, Wheat, Soybeans, Sugar, Cocoa, Cotton
• Stock Index Futures: S&P 500, Nikkei 225, Dow Jones (DJIA)
• Interest Rate Futures: U.S. Treasury Bonds, Eurodollars

The Importance of Volatility:

They used the Average True Range (ATR) of a 20-days, termed “N”, in many of their calculations to account for the impact of volatility.

Pyramiding (accumulation): Adding to Winning Trades:

The Turtles were also taught to scale into winning trades. This method, known as pyramiding or accumulation, involved adding to a trade if the price moved in their favour. 

If N (ATR) was 40 points, they would add 0.5 × the Average True Range to the trade. 

For example, accumulation of a new position would be actioned at 20 and then again at another 20, adding up to a maximum of four positions: the original trade plus three additional entries.

Exits and Risk Management

Initial Stop Loss:

Each trade was initiated with a stop loss placed 2N away from the entry price. This ensured that no single trade risked more than 2% of the account balance.

Trailing Stop:

As the trade progressed and additional units were added, the stop loss was dynamically adjusted using the most recent entry as a reference.

The trailing stop for all positions was 2N on the latest (most recent) added position. If the stop was hit, all positions in that trade were closed simultaneously, locking in gains and controlling downside risk.

How Have Markets Changed Since the 1980s?

1. Algorithmic and high-frequency trading (HFT) now dominate markets, often resulting in faster and more erratic price movements.
2. Trading costs (commissions, spreads) have significantly decreased, enabling more frequent entries and tighter stops.
3. Trend persistence has diminished. Markets often reverse more quickly, making it harder for long-trend strategies to succeed without adaptation.
4. Forex and futures markets are more liquid, making it easier to execute large positions with less slippage.
5. Futures markets have seen changes in volume and type, enabling a greater selection of asset choices.
6. Stock indices tend to exhibit more mean reversion, demanding smarter trend filters.
7. Breakouts from common levels are less reliable, often resulting in quick reversals due to stop hunting and market manipulation.
8. A greater need for confirmation signals before acting on a breakout.
9. ATR-based sizing remains relevant but may benefit from more dynamic scaling.
10. Rigid stop-loss rules (like 2× ATR) are more likely to be hit due to shorter trend durations.

How Could the Turtle System Be Used Today?

Although the principles underpinning the turtle systems remain valid for trading today, some tweaking of the original criteria and parameter levels would be worth exploring. 

Entry Modifications:

Requiring confirmation from trend filters, such as price being above the 200 EMA or RSI values above 55, or perhaps looking for confirmation on larger timeframes, could reduce false signals and improve win rates.

Additional volume filters, including relative volume, OBV, and average volume, may add value to decision-making

Incorporating indicators developed since the turtle experiment, such as other variations of the ATR and RSI, Bollinger bands, and Keltner channels, may be worth consideration for the confluence of the basic trend following structure. 

Exit and Risk Enhancements:

In the turtles experiment, the ATR was static once the initial trade was entered; the N value remained fixed for that position and all subsequent accumulated positions. 

Arguably a dynamic ATR instead of a fixed level may be worth consideration to adjust to changing volatility over time.

This especially makes sense if you are considering adding additional confluence from other indicators for the initial position.

Trade Like a Turtle

Using the original Turtle approach could be considered a checklist for good practice. Especially when it comes to rule-based system designs, risk management, emotional discipline in execution, and equal attention to entry, accumulation, and exit.

Consider testing a “Turtle-inspired” strategy using current instruments and enhanced filters before taking it live. The spirit of the Turtle experiment lives on not just in its rules, but in the key message that trading can be taught. 

You can learn it, but success depends on sticking to a well-thought-out plan and adhering to the golden rules of trading that still apply today.

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