Definitions
In plain terms
It accounts for both individual asset variability and how assets move together.
Technical
For weight vector w and covariance matrix Sigma, volatility is the square root of w transpose Sigma w, with frequency and annualization stated.
Scope
Volatility measures dispersion, not every form of risk, loss, liquidity, or model uncertainty.
Formula
sigma_p = sqrt(w' * Sigma * w)\sigma_p=\sqrt{w^\top\Sigma w}| Symbol | Meaning | Unit |
|---|---|---|
w | portfolio weight vector | decimal weights |
Sigma | return covariance matrix | return squared |
Output unit: return volatility
Examples
- A governed methodology records portfolio volatility with its source, cutoff, units, parameters, and effective version.
Common misconceptions
- Portfolio Volatility does not have one universal implementation without the declared methodology, data basis, and constraints.
Concept relationships
Prerequisites
Related
Where this concept is used
Evidence and governance
- Portfolio Selection The Journal of Finance / Harry Markowitz · first party technical publication
Supports: preferred label, short definition, technical definition, formula
Limits: Later index constraints, covariance estimators, investability rules, and production optimization controls are separate choices.
- Fintech Builder Glossary Definition Contract The Fintech Builder · internal governed contract
Supports: variant distinction
Limits: Defines governed platform behavior rather than claiming these policies are universally prescribed by external McClellan methodology.
- Reviewed by
- fintech-builder-batch-004
- Last reviewed
- 2026-07-27
- Next review
- 2027-07-27
- Record status
- evidence reviewed
This record is evidence-reviewed and readable, but not yet promoted to published — it is served noindex,follow and excluded from the sitemap.