Trading Tartaruga — Turtle Trading

Em 1983, Richard Dennis e William Eckhardt conduziram um experimento extraordinário: poderiam pessoas sem experiência de trading ser ensinadas a trade profitably usando um sistema de rules? Dennis bet “yes”; Eckhardt bet “no”. Dennis recruited 23 “Turtles” (tartarugas) — people from diverse backgrounds — taught them a systematic trend-following method, e gave them capital. Result: many Turtles became extraordinarily profitable, generating returns de 80-100%+ annually over several years. O experimento provou que trading é skill que pode ser learned, não innate talent.

Princípios Turtle

Princípio 1: Trade com o Trend

Turtles são trend followers — they don’t predict, they follow:

• Buy when price breaks above recent high (20-day ou 55-day)
• Sell when price breaks below recent low
• Stay in position until trend ends (defined by exit rules)
• Não try to pick tops/bottoms — enter after trend starts, exit after trend ends

Princípio 2: Cut Losses Short

• Maximum loss per trade: 2% of account
• Stop loss placed at entry — never move stop away from position
• Exit immediately when stop is hit — no exceptions, no “waiting for reversal”
• Small losses are cost of doing business

Princípio 3: Let Profits Run

• Não take partial profits early
• Use trailing stop — move stop as profit grows
• Exit only when trailing stop is hit or system signal says exit
• Many Turtle profits came from a few huge winners — 5-10R trades

Princípio 4: Manage Risk Aggressively

• Position sizing based on volatility — not fixed percentage
• More volatile = smaller position
• Less volatile = larger position
• Total portfolio risk capped at specific limits

Sistema Turtle Completo

Entry Systems

System 1 (Short-term):

• Buy when price breaks above 20-day high
• Sell when price breaks below 20-day low
• Skip signal if last signal was profitable (filter rule)

System 2 (Long-term):

• Buy when price breaks above 55-day high
• Sell when price breaks below 55-day low
• Always take signal — no filter rule

Exit Rules

System 1 Exit:

• Exit long when price breaks below 10-day low
• Exit short when price breaks above 10-day high

System 2 Exit:

• Exit long when price breaks below 20-day low
• Exit short when price breaks above 20-day high

Position Sizing — O “N” Unit

Turtles sized positions based on market volatility measured by N (average true range over 20 days):

• 1 Unit = account risk of 1% per position
• Unit size = (1% × Account Value) / (N × Point Value)
• More volatile market → smaller N units → smaller position
• Less volatile → larger N units → larger position

Example (adaptado para B3):

• Account: R$100,000
• Risk per unit: 1% = R$1,000
• PETR4 N (ATR 20-day) = R$1.50
• Unit size = R$1,000 / R$1.50 = 667 shares
• 4 units maximum = 2,667 shares (4% max risk)

Pyramid (Adding to Positions)

Turtles added positions as trend progressed:

• Add 1 unit when price moves ½N in favorable direction from last entry
• Maximum 4 units per position
• Maximum risk: 4 units × 1% each = 4% per position
• Total portfolio risk capped at specific limits

Risk Limits

• Single market: max 4 units (4% risk)
• Related markets (e.g., oil stocks): max 6 units (6% risk)
• Single direction (all longs/shorts): max 10 units (10% risk)
• Total portfolio: max 12 units (12% risk)
• When limits hit: reduce existing positions first

Por Que Turtle System Funcionou?

1. Trend Following é Statistically Valid

Markets trend — statistically provado. Following trends captures these moves.

2. Risk Management Preserves Capital

2% risk per trade → never catastrophic loss. Survive losing streaks.

3. Letting Winners Run Captures Fat Tails

Market returns have fat tails — big winners are rare but huge. Turtle captures these.

4. Rules Eliminate Emotion

Every decision is pre-defined — no emotional override.

5. Volatility-based Sizing Adapts to Market Conditions

High volatility → small positions → survive turbulence Low volatility → large positions → capitalize on calm

Turtle Trading no B3

Adaptation para Mercado Brasileiro

• 20-day breakout funciona bem em IBOV → trends de 2-4 weeks
• 55-day breakout funciona em IBOV monthly → macro trends
• Volatility sizing é critical em B3 → IBOV vol é higher than US markets
• System 1 para swing trading (2-5 days)
• System 2 para position trading (weeks-months)

Exemplo PETR4

• PETR4 breaks above 55-day high em R$35
• N = R$1.20 (ATR 20-day)
• Buy 1 unit = (1% × R$100K) / (R$1.20 × 100) = 833 shares
• Add at R$35.60 (½N above entry) → 1 more unit
• Add at R$36.20 → 1 more unit
• Add at R$36.80 → 1 more unit (max 4 units)
• Trailing exit: sell when price breaks below 20-day low
• If PETR4 trends to R$42 → profit of ~R$5.50 per share × 3,332 shares = ~R$18,300
• Risk: 4% = R$4,000 → R:R = 4.6:1

Limitações

• Whipsaw em ranges — breakout systems lose em sideways markets
• Losing streaks — trend following has 40-50% win rate, long streaks possible
• Requires discipline — rules seem simple but执行 é hard (emotion override)
• Market adapt — others know Turtle rules → front-running possible
• Volatility changes — N-based sizing assumes stable volatility

Conclusão

Turtle Trading provou algo revolutionary: trading pode ser learned through systematic rules. Não é magic talent — é methodology + discipline. Para investidores brasileiros, o Turtle system oferece:

• Clear entry/exit rules → no ambiguity
• Volatility-based sizing → adapts to B3’s higher volatility
• Trend following → statistically valid approach
• Risk management → 2% rule preserves capital

O experimento provou que traders com discipline e systematic approach podem generate returns extraordinários — mesmo sem prior experience. A lição: sistema + discipline = success.

Trading Tartaruga