🛡️Risk & portfolio management
Stop-loss, position sizing, diversification, rebalancing and correlation — not losing matters more than winning.
Risk & portfolio management — overview
Risk management is the discipline that decides long-term survival in the market more than stock picking does. The math is harsh: after a 50% loss you need a 100% gain just to get back to zero. That is why seasoned investors say not losing matters more than winning. The core tools are the stop-loss (a preset loss limit), position sizing (position size proportional to risk) and diversification (spreading across uncorrelated assets). Position sizing is an underrated but key tool: each position's size should follow how much you are willing to lose on the trade, not how much you like the idea. Diversification then reduces risk by spreading capital across assets that do not move alike — when one falls, another may hold. Correlation is the key concept here: two "different" stocks from the same sector can fall together. Rebalancing keeps a portfolio at target weights and forces you to sell the expensive and add the cheap. QMA supports risk management with tools like stop alerts (which only inform, they do not sell automatically), correlation analysis and portfolio stress tests. The goal is not to remove risk — that is impossible — but to make it conscious and managed. This section describes the individual tools and principles. This is educational content, not investment advice.
Risk & portfolio management articles
Excel pour la gestion d'investissements vs. un tracker automatisé : pourquoi votre feuille de calcul finira par craquer
Une feuille de calcul Excel est un excellent point de départ — jusqu'à ce que votre portefeuille prenne de l'ampleur. Elle finit alors par céder sous le poids des saisies manuelles, des prix obsolètes, des fractionnements, des dividendes, des devises et du rapprochement fiscal FIFO. Voici où Excel atteint ses limites et ce qu'un bon tracker automatisé apporte en plus.
Dimensionnement Dynamique des Positions : Comment l'ATR et le Critère de Kelly Protègent Votre Portefeuille contre la Volatilité
Une technique avancée de gestion des risques combine l'Average True Range (ATR) avec le dimensionnement des positions basé sur la volatilité et le Critère de Kelly — le résultat est un nombre d'actions dérivé directement de la volatilité actuelle du marché, et non d'une intuition.