A trader starts with $5,000. Excited by a setup, they put $2,000 — 40% of capital — into a single position. The trade moves 15% against them before they exit. That's a $300 loss, or 6% of total capital, gone in one session. Do that three times and the account is down 18%, requiring a 22% gain just to recover. That asymmetry is the quiet killer.

Concentration risk is exactly what it sounds like: too much capital exposed to a single idea, sector, or correlated group of positions. Small accounts amplify the damage because there is no buffer. A $500,000 account absorbing a $300 loss barely notices. A $5,000 account just lost 6% of its operating capacity. The maths do not care about your conviction.

CONCEPTPosition size determines survival — entry and exit logic determine profit.
WARNINGRisking more than 2% of capital per trade on a small account accelerates ruin probability exponentially.
KEY IDEAA string of losses is inevitable — your position sizing must survive the worst streak, not just the average one.

The standard rules-based approach: risk no more than 1–2% of total account equity per trade. On a $5,000 account, that means maximum risk of $50–$100 per position. If a stop-loss is placed 5% below entry, the maximum position size is $1,000–$2,000. That is the calculation — not a feeling, not a guess. Every single time.

Loss vs. Recovery Required10%11%20%25%33%50%40%67%-10%-20%-33%-40%DrawdownRecovery neededDeeper losses demand disproportionate recoveries

Traders managing concentration risk also track correlation. Holding three positions all driven by the same macro theme is not diversification — it is the same bet wearing different clothes. A rules-based approach caps total correlated exposure at 6–10% of account equity, regardless of how many individual positions are open. The mechanics of concentration risk are well documented, and the mathematics of drawdown recovery make a compelling case for discipline. Position sizing methodology, including the widely referenced Kelly Criterion, reinforces why fractional sizing on small accounts is not timidity — it is engineering.

The account that survives ten losing trades in a row is the account still open when the edge eventually pays out. Size for survival first, performance second.

This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.