Volatility
What is volatility?
Volatility measures how much an investment's price moves around, usually as the standard deviation of returns. It describes turbulence, not the probability of permanent loss.
- Written by
- Suggested Investments Research Team
- Content type
- Reference definition
- Published
- 2026-09-13
- Last reviewed
- 2026-09-13
Movement is not risk
For a long-term owner, the real risk is a business that permanently deteriorates. Volatility only becomes loss when it forces you to sell at the wrong moment.
Position size is the practical control
You cannot lower an investment's volatility, but you can choose how much of your portfolio experiences it.
A worked example
Two holdings can end a year at the same price, one having drifted quietly and one having fallen 35% in between. Same return, very different experience.
The mistake people make
Avoiding volatility entirely and accepting returns that fail to outpace inflation over decades.
How we use it
Volatility and drawdown behaviour both feed Risk Intelligence, the largest single component of the Suggested Investment Score at 30%.
Related terms
Sources and methodology
- Investor.gov investor education — U.S. Securities and Exchange CommissionPrimary source
- Intelligent Accumulation methodology — Suggested InvestmentsPrimary source
Keep reading
- Investing Glossary
Every investing term we use, defined once and in plain English — from compounding and drawdown to Form 13F and share dilution.
- Compound interest
Compound interest is growth earned on both your original money and on the growth it has already produced. It is the reason long holding periods matter more th
- Dollar-cost averaging
Dollar-cost averaging means investing a fixed amount on a fixed schedule regardless of price. It removes the need to decide when to invest, and it buys more s
- Free cash flow
Free cash flow is the cash a business has left after paying the costs of running and maintaining itself. It is the cash that can fund dividends, buybacks, deb
- Expense ratio
An expense ratio is the annual percentage of your money a fund keeps to run itself. It is deducted from returns quietly, every year, whether the fund performs
- Maximum drawdown
Maximum drawdown is the largest peak-to-trough fall an investment has suffered over a period. It measures the worst stretch an investor would have had to sit
Educational information only. Nothing here is a recommendation to buy or sell any investment, and no research measurement removes the risk of loss.