What You'll Learn
🔹 What Is This Book About?
The book answers one critical question: "How much should you risk per trade?"
Positions sizing is most important factor in trading success (90% of performance).
Nearly 100 different position sizing models are explored thoroughly.
Shows how to choose right model for your system and objectives.
Demonstrates how proper sizing turns mediocre systems into profitable ones.
🔹 The Core Message
Position sizing matters more than entry signals or trading systems.
Your position size determines if you reach your financial objectives.
Most traders fail due to position sizing, not because of bad systems.
Even average trading system becomes profitable with proper sizing.
Success isn't about what you trade but who you are when you trade EBC Financial Group.
🔹 The Three Position Sizing Categories
Fixed Allocation Models: Risk same percentage per trade always
Growth Optimization Models: Maximize account growth mathematically
Adaptive Models: Adjust sizing based on conditions and volatility
🔹 The 5 Big Ideas
Idea 1 — Position Sizing is Foundation of All Trading Success
90% of performance variation comes from position sizing.
Entry signals contribute only 10% to results.
Most traders obsess over entries. They ignore sizing.
Trading systems without sizing = Inconsistent results always.
Idea 2 — Define Objectives Before Designing Position Sizing
Few traders clearly define their actual trading objectives.
Position sizing must match specific, written objectives.
Different objectives require different sizing strategies.
Vague objectives lead to vague sizing decisions.
Idea 3 — System Quality Number Determines Sizing Aggressiveness
SQN measures overall quality and consistency of system.
Higher SQN allows more aggressive position sizing.
Lower SQN requires more conservative position sizing.
Tharp developed SQN metric to objectively rank systems on consistency and risk-adjusted returns EBC Financial Group.
Idea 4 — Six Market Types Require Different Sizing Strategies
Markets have six distinct types based on trend and volatility.
Each type requires different position sizing approach.
Your system performs differently in each market type.
Adapt sizing based on current market type.
Idea 5 — Psychology Sabotages Position Sizing Discipline
Human emotions override mathematical position sizing logic.
Overconfidence makes traders size too large.
Fear makes traders size too small.
Mechanical execution prevents emotional override.
🔹 Key Frameworks or Models
Position Sizing Models (Nearly 100 variations):
Fixed Fractional (Risk same % per trade)
Optimal f (Maximize geometric return)
Percent Risk (Risk fixed dollar amount)
R-Multiple (Risk based on volatility)
Kelly Criterion (Mathematical optimization)
Drawdown-Based (Adjust for current drawdown)
Volatility-Adjusted (ATR-based sizing)
And 90+ more proprietary variations
The Six Market Types:
Up Trend + High Volatility
Up Trend + Low Volatility
Down Trend + High Volatility
Down Trend + Low Volatility
Sideways + High Volatility
Sideways + Low Volatility
System Quality Number (SQN) Rating Scale:
SQN 1.6 or below = Below average system
SQN 1.6-1.9 = Average system quality
SQN 2.0+ = Excellent system quality
Higher SQN = Can use more aggressive sizing
The Four-Step Position Sizing Process:
Define your trading objectives clearly
Calculate System Quality Number
Choose appropriate position sizing model
Execute sizing rules mechanically
🔹 Famous Examples in the Book
Real Trader Examples:
Traders with mediocre systems earning millions using proper sizing
Traders with excellent systems going broke using improper sizing
Successful traders using different models (Fixed Fractional, Optimal f, Kelly)
Comparison of sizing across different market types
Case Studies:
Profitable system earning mediocre returns due to undersizing
Mediocre system becoming profitable with proper sizing
Trader blowing up account despite good system (sizing problem)
Trader rebuilding account using sizing discipline
System Examples:
Trend following system with specific sizing for each market type
Day trading system using volatility-adjusted sizing
Position trading system using fixed fractional sizing
Mean-reversion system using drawdown-based sizing
🔹 What Makes This Book Different
Comprehensive Coverage: Nearly 100 models with explanations
Practical Implementation: Real examples and Excel files included
Psychological Focus: Addresses why traders ignore sizing
System-Agnostic: Works with any trading system or strategy
Quantitative Approach: Mathematical formulas and calculations
No Entries/Exits: Focuses purely on "how much," not "when"
Over 400 Pages: Extremely detailed and thorough coverage
Q&A Section: Addresses 7 categories of real trader questions
Updated 2nd Edition: New models and refined content
🔹 Who Is This Book For?
Active traders wanting to improve consistency and results
Day traders seeking volatility-adjusted position sizing
Swing traders building systematic trading plans
Options traders managing multi-leg positions
Futures traders managing leverage and margin
Forex traders trading multiple currency pairs
Stock traders managing portfolio allocation
Portfolio managers balancing multiple positions
Traders with small accounts maximizing limited capital
Serious traders willing to study deep technical content
Quant traders developing algorithmic position sizing
Prop traders meeting firm risk management requirements
Anyone making losses looking to understand why
🔹 How The Book Is Structured
Foundation Chapters (1-5):
Introduction to position sizing fundamentals
Understanding trading objectives clearly
System Quality Number (SQN) rating
Six market types framework
Overview of position sizing models
Core Model Chapters (6-13):
Fixed Fractional position sizing
Optimal f position sizing
R-Multiple position sizing
Kelly Criterion position sizing
Drawdown-based position sizing
Volatility-adjusted position sizing
Account size and liquidity constraints
Multiple position management
Implementation Chapters (14-18):
Testing and validating position sizing
Position sizing mistakes to avoid
Psychological biases affecting sizing
Position sizing software examined
Q&A: Seven categories of trader questions
🔹 Why This Book Matters Today (2025)
Algorithmic Trading: Quant traders apply Tharp's sizing models constantly
Risk Management Crisis: 2024-2025 leverage losses prove sizing importance
Crypto Volatility: Digital asset traders face extreme sizing challenges
Retail Trading Boom: Millions need Tharp's sizing principles urgently
AI Trading: Algorithms implement Tharp's sizing frameworks automatically
Regulatory Focus: Risk management regulations rely on Tharp's concepts
Hedge Fund Standard: Professional money managers use Tharp's models
Prop Trading Rules: All prop firms enforce maximum sizing limits
Your SBI PO Exam: Banking officer exam covers risk management principles
Your Hexaspear App: Should teach Tharp's position sizing concepts to all users
Market Crashes: 2024 VIX spikes showed undersized traders survived; oversized traders destroyed
🔹 Key Quotes
💬 "You don't trade the markets. You trade your beliefs about the markets." — Van K. Tharp
💬 "Position sizing is the most important factor in trading success." — Van K. Tharp
💬 "90% of trader performance variation comes from position sizing." — Van K. Tharp
💬 "An average system with great position sizing beats a great system with poor position sizing." — Van K. Tharp
💬 "The purpose of position sizing is to help traders meet their objectives." — Van K. Tharp
💬 "Most traders fail because of position sizing, not because of bad systems." — Van K. Tharp
💬 "Risking more than 3% per trade is financial suicide." — Van K. Tharp
💬 "Success as a trader has everything to do with the 'how much' factor." — Van K. Tharp
🎯 One-Line Summary
Van Tharp's Definitive Guide to Position Sizing reveals that trading success depends 90% on proper position sizing (the "how much" factor) and only 10% on entry and exit signals, with nearly 100 models to choose from based on your system and objectives.