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Position Sizing

Position sizing translates conviction into controlled risk so one trade cannot dominate outcomes.

The Core Idea

Sizing should be driven by risk, not by dollars. Two positions of equal dollar size can have radically different downside potential depending on volatility and stop distance.

Position Size = (Portfolio Value × Risk Per Trade) ÷ (Entry Price - Stop Loss)

A Practical Workflow

  • 1. Define risk-per-position (as % of portfolio) and max concentration caps.
  • 2. Set invalidation level (stop) using structure or ATR-based distance.
  • 3. Adjust size down when correlation clusters are crowded.
  • 4. Re-evaluate size when volatility regime changes.

Common Pitfalls

  • Equal-dollar sizing across names with very different volatility.
  • Ignoring correlation and accidentally doubling the same risk factor.
  • Moving stops after entry without resizing risk.

Apply Position Sizing In AlgoVestIQ

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Related Concepts
Risk BudgetingCorrelationMax Drawdown (Concept)Position Sizing (Concept)

Position Sizing FAQs

What is a good risk-per-trade?

Many disciplined approaches use 0.25% to 2% of portfolio value at risk per position, depending on strategy volatility. The correct number is one you can maintain across losing streaks without breaking process.

Why size by volatility?

Volatility-based sizing normalizes risk across assets. Without it, a high-volatility name can dominate portfolio outcomes even at the same dollar allocation.

Should I size based on conviction?

Conviction can influence sizing only after risk constraints are satisfied. Risk budget, correlation clustering, and invalidation distance should dominate the sizing decision.