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Position sizing is the quiet discipline that separates a good year from a career-ending one. In the current macro environment, where liquidity shifts can happen in hours and volatility spikes without warning, I keep coming back to the same principle: size is not about conviction, it is about survival. Why Position Sizing Matters More Than Your Thesis Every allocation starts with a view. But the market does not reward the view; it rewards the way you structure your exposure to it. A thesis can be right and still lose money if the position is too large for the liquidity available. I have seen this play out across multiple cycles, and it never changes. The Liquidity Trap In alternative investments, liquidity is not a constant. It is a variable that compresses exactly when you need it most. The fund that looks diversified on paper can become a single point of failure when redemptions hit and underlying assets cannot be sold at any price. That is why I stress-test every position against a scenario where I cannot trade for a week, not a day. Volatility Is Not Risk—But It Can Become It Volatility is often described as risk, but that is imprecise. Volatility is opportunity if your sizing leaves room to act. Risk is when your position is so large that a move against you forces a decision based on fear rather than analysis. The goal is to keep every position small enough that you can think clearly, even when the tape is moving fast. Practical Rules I Apply Never let a single position exceed a threshold that would force a margin call under a 3-sigma move. Keep a liquidity buffer that covers at least one full quarter of expected redemptions and margin requirements. Re-evaluate position size whenever the macro context changes, not just when the P&L moves. Remember that correlation goes to one in a crisis—diversification is a fair-weather friend. For affluent investors and family offices, the same logic applies to their overall portfolio. It is not about picking the perfect hedge fund or the next big private equity deal. It is about making sure that no single decision, no matter how well researched, can take you out of the game. In Frankfurt, where the conversation often centers on yield and access, I remind my clients that the first rule of wealth preservation is not losing the ability to stay invested. Position sizing is that rule in practice. This note reflects my personal market observations and is not financial advice. Always consult your own advisors before making allocation decisions.