Performance & Return
Volatility
Definition
The degree to which the portfolio's value fluctuates over time.
Why it matters
It is the most commonly cited measure of risk. Higher volatility means larger swings in both directions.
What most investors miss
The gap between what the term means and how it is usually applied.
They check volatility per position not per portfolio. Portfolio volatility is lower than the average of its parts when holdings are uncorrelated.
How to read it
Read volatility at the portfolio level. The correlation between holdings determines whether individual volatilities compound or offset.
Multi-account lens
How this term reads differently across brokers and accounts.
A fragmented portfolio makes it hard to calculate true portfolio volatility because the full holdings picture is never in one place.
Related terms
Terms that connect to volatility.
Sharpe Ratio
A measure of return per unit of risk calculated as excess return divided by the standard deviation of returns.
Drawdown
The peak-to-trough decline in portfolio value over a specific period before a new high is reached.
Portfolio Performance
The overall return of the portfolio over a defined period accounting for all holdings cash and distributions.
Continue only if the next question is clearer now
Diagnosis first, then workflow, then fit.
Follow Upogee on X
Product updates, portfolio review ideas, and building notes.