Chinese A-Share Price Adjustments and Recovering Raw Close Prices

Summary

This brief data-platform exchange explains why a Chinese stock’s prices may differ from those shown by another trading application. The user reports that extracted prices appear backward-adjusted and questions whether this discrepancy makes backtests unreliable. The response attributes differences to platforms using different data sources and adjustment-factor conventions, so a mismatch alone does not establish that the source data is incorrect.

For users who want an unadjusted close price, the response suggests dividing the platform’s adjusted close feature by its adjustment factor. It gives no independent data validation, comparison across vendors, or evidence about the accuracy of the particular stock series. The proposed conversion also depends on the adjustment factor’s definition and consistent application, so users should verify the resulting price series before relying on it in a backtest.

Key ideas

• Different data providers may apply corporate-action adjustment factors differently, producing different historical prices.
• A mismatch with another trading application does not by itself show that a data source is wrong.
• The response suggests dividing adjusted close by the adjustment factor to derive a raw close price.
• The explanation provides no independent verification of the reported stock data.

Tags

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.