Risk Management & Position Sizing

Most investors spend their energy hunting for the next great trade. The ones who last spend it on something far less glamorous: making sure no single trade — or unlucky run of trades — can ever take them out of the game. That is what this book is about. Returns get the headlines, but risk control is the quieter discipline that decides who is still investing in ten years and who became a cautionary tale.

What this book teaches

Risk management is not a vague attitude of "being careful." It is a concrete, learnable set of tools, and you will work through all of them here: how to define risk honestly as the probability of permanent loss rather than mere price wobble; why even a strategy with a real edge can still blow up an account, and the ruin math that explains it; how to place stop losses that protect you without getting picked off by noise; and how to size every position so a loss is survivable by design.

From there the book widens out to the whole portfolio — correlation, concentration, beta, and the drawdown arithmetic that makes a 50% loss require a 100% gain to recover. You will learn Value-at-Risk and its limits, how to hedge with options, when portfolio insurance is worth its cost, and why the order of your returns matters as much as their average. Later chapters cover currency and country risk, black swans and fat tails, and a gallery of real disasters — LTCM, Archegos, Barings, Knight Capital — dissected for the lessons that apply directly to a retail account.

Who it is for

This book is written for the self-directed investor or trader who already understands the basics of how markets work and now wants to stop leaving survival to chance. You do not need advanced mathematics; every formula is explained in plain language with worked numbers. If you have ever held a loser too long, sized a position by feel, or watched a drawdown shake your conviction, the chapters ahead are for you.

How to read it

The chapters build on one another, so reading start to finish gives you the cleanest path: definitions first, then ruin math, then the practical machinery of stops and sizing, then portfolio-level and tail-risk topics. That said, each chapter stands on its own. If you have a specific gap — say, stop-loss placement or hedging with options — jump straight there and follow the cross-links back to any foundations you need. The final chapters help you assemble everything into a written personal risk framework you can actually follow under pressure.

Start with What Risk Actually Means →