Map the business connection
Companies may share customers, suppliers, end markets or risk factors. That is useful context even without price data. It does not establish that their shares move together or in opposite directions.
Measure with aligned observations
Return correlation compares a sequence of returns over the same dates. Price levels alone can be misleading. Missing dates, currency differences and corporate actions affect interpretation. Our calculator requires aligned daily return pairs and reports the sample count.
Expect relationships to change
A historical correlation is not a stable promise. Different market conditions can change it, and a short sample is especially noisy. Use it as one research lens alongside holdings overlap and economic exposure.
Put it into practice
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