Individual skill
position-sizer
Calculate risk-based position sizes for long stock trades. Use when user asks about position sizing, how many shares to buy, risk per trade, Kelly criterion, ATR-based sizing, fractional-share sizing, or portfolio risk allocation. Supports stop-loss distance calculation, volatility scaling, and sector concentration checks.
skills/position-sizer/SKILL.md
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SKILL.mdcore · 8,094 bytesSKILL.mdcore · 8,094 bytesSKILL.mdcore · 8,094 bytesreferences/sizing_methodologies.mddoc · 13,088 bytesrequirements.txtdoc · 70 bytesscripts/position_sizer.pyruns · 20,587 bytesscripts/tests/conftest.pyruns · 298 bytesscripts/tests/test_position_sizer.pyruns · 31,853 bytes
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# Position Sizer
## Overview
Calculate the optimal number of shares to buy for a long stock trade based on risk management principles. Supports three sizing methods:
- **Fixed Fractional**: Risk a fixed percentage of account equity per trade (default: 1%)
- **ATR-Based**: Use Average True Range to set volatility-adjusted stop distances
- **Kelly Criterion**: Calculate mathematically optimal risk allocation from historical win/loss statistics
All methods apply portfolio constraints (max position %, max sector %) and output a final recommended share count with full risk breakdown. The default output is whole shares. Use `--fractional` only when the user's broker supports fractional shares for the security and order type.
## When to Use
