Why Adjusted Stock Prices Differ Across Data Providers
Summary
This short data-support exchange explains a discrepancy between stock prices shown by two Chinese market data services. The response attributes the difference to BigQuant providing backward-adjusted prices and notes that providers can use different adjustment conventions. As a result, a historical price value from one source may not match the corresponding value from another even when both refer to the same stock and date.
The exchange offers no detailed calculation, worked reconciliation, or confirmation across additional securities. It suggests checking whether other stocks show similar discrepancies, but does not establish which price series is appropriate for a particular analysis. Researchers comparing charts, indicators, or backtests should identify whether each source uses raw, forward-adjusted, or backward-adjusted prices and align conventions before comparing values. Adjusted series also should not be confused with raw executable prices.
Key ideas
- Historical stock prices can differ across providers because adjustment conventions vary.
- The reply identifies backward adjustment as the explanation for the cited BigQuant value.
- The exchange does not provide a detailed reconciliation or broader validation.
- Price comparisons and backtests require consistent adjustment conventions.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.