Missing is not zero. A displayed number is useful only when you understand its date and scope.
Check the observation date
Different views can depend on different update schedules. Look for the displayed session or observation date before comparing a chart with a scan or market table. Delayed intraday data and completed daily observations are different kinds of information.
Understand the covered universe
A ranking or aggregate describes the symbols included in its calculation. Missing classifications, index membership, or prices can change that set. Read the coverage and provenance notes to see which observations support a result.
Treat unavailable values carefully
A blank value or unavailable indicator is not a zero return or a neutral signal. The calculation may lack enough history or a required field. Review the missing-data notes before sorting, averaging, or comparing observations outside the app.
Read historical limits
Historical scans use historical prices through the selected session, but some metadata may use current values when no history exists. Corporate-action records do not automatically adjust the displayed price series. Keep these distinctions with exported data and shared research.
Read our data and methodology notes for coverage and calculation context. This guide explains research tools and observations. It does not recommend a trade or investment.