Beta: how closely a security repeats the market
· beginner
Automated material · TradeAlmanac editorial deskDraft prepared by a language model from our stored data; not reviewed by an editor.
Beta shows how strongly a security moved with the market in the past.
How to read it
A value near one means the security tracked the market. Above one it amplified the market's moves; below one it damped them.
A negative value would mean moving against the market; in practice that is rare and usually unstable.
What to do with it
Judge how far a portfolio depends on the market as a whole. A portfolio of high-beta securities falls harder than the index in a bad period — a property worth knowing in advance.
Compare results honestly: beating the index with a high beta is not an achievement but a consequence of taking more risk — The benchmark: what to compare your result against honestly.
What it does not measure
Company-specific risk: an accident, a corporate conflict, a regulatory decision. Those events are unrelated to the market, and beta says nothing about them.
That is exactly why beta is a measure of market risk rather than of risk in general — Volatility is not risk.
Where it is used
In hedging: sizing a protective position requires an estimate of the portfolio's sensitivity to the market — Hedging: insurance paid for with return.
In sector analysis: cyclical industries carry a higher beta — Economic cycles: why downturns repeat.
Draft prepared by a language model from our stored data; not reviewed by an editor.
Model: claude-opus-5
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