What is alpha in investing?
In one line: Alpha is the part of an investment's return above (or below) what its market risk, measured by beta, would predict.
A simple example
Say the S&P 500 returned 10% in a year. A fund has a Beta of 1.2, so it tends to move 1.2 times as much as the market.
Its expected return from the market alone: 10% × 1.2 = 12%.
The fund actually returned 14%. The extra 2% is its alpha: +2.
If it had returned 9%, its alpha would be −3. A math example, not a promise.
(The full formula also subtracts a risk-free rate, like a Treasury bill yield. We've left it out to keep the idea clear.)
Why it matters
Alpha separates skill from tide. If the whole market rose 20%, a fund that rose 20% didn't do anything special. It just rode the market.
That's why alpha matters when you compare a fund, a newsletter or your own results against a plain Index fund. The question is: did this beat what the market gave for free?
Our page on stocks vs ETFs covers the index-fund side.
A common mistake
Calling any big gain "alpha." A high-beta stock rising 30% in a strong year may have no alpha at all. It may have done exactly what its beta predicted.
The other trap is a short track record. One good year can be luck. Alpha needs many years of data to mean much, and positive alpha in the past doesn't promise it in the future.
Judge your own trading the same way. Compare your results with simply holding an index over the same time. Track it in your trading journal.
Questions
Is alpha the same as return?
No. Return is the whole gain or loss. Alpha is only the part above or below what market risk explains.
Can alpha be negative?
Yes. Negative alpha means the investment did worse than its market risk predicted. After fees, many funds show this.
What's the difference between alpha and beta?
Beta is how much something moves with the market. Alpha is what's left over after that.
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