What is Beta?
A measure of how much an asset tends to move with the overall market.
Educational — not investment advice
Beta compares an asset’s moves to the market as a whole. A beta of 1 means it roughly tracks the market. Above 1 means it tends to amplify market moves; below 1 means it moves less than the market; a negative beta means it tends to move opposite the market.
It is a useful shorthand for market-correlated risk — how exposed you are to broad swings rather than to a single company’s story.
The trap most people miss
Beta only captures risk that moves with the market. A stock facing a binary, company-specific event (an FDA decision, a lawsuit, a fraud) can show a calm, low beta right up until the day that risk lands. Low beta does not mean safe — it means "not correlated with the market."
Frequently asked about Beta
Does a low beta mean low risk?
No. It means low market-correlated risk. Company-specific and event risk are invisible to beta.
Is beta a live or historical number?
Beta is estimated from historical price moves over a window, so it is a backward-looking tendency, not a live figure — and it drifts over time.
Related terms
Guides that use Beta
See your own portfolio’s beta
Add what you hold and Tradune measures how much your portfolio moves with the market, alongside correlation and tracking error against the benchmark.
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This definition is for educational purposes only and is not investment, tax, or financial advice. Concepts are explained in general terms; how they apply to your situation can differ. Always do your own research.