Checking Adjusted Stock Prices Across Data Vendors

Summary

This user report describes a discrepancy in Chinese stock prices around corporate actions. The author says that prices derived from a platform’s close and adjustment factor did not match prices shown by two brokerage or financial-data applications for Ping An Bank. Because adjusted prices feed moving averages and other strategy inputs, the author reports that the mismatch also changed strategy outputs. The document raises a practical data-validation issue: adjustment conventions and vendor data can affect signals and backtests.

The evidence is a single user’s account, without dates, raw observations, a documented adjustment formula, or an independent diagnosis. It does not establish which source is correct or whether the difference reflects an error, a different adjustment convention, or implementation details. The general lesson is to verify corporate-action adjustments and reconcile price histories across sources before relying on derived indicators; this report does not provide a resolution or quantify trading impact.

Key ideas

• The author reports that adjusted prices calculated from one platform differed from prices displayed by two other services around corporate actions.
• Price adjustment differences can alter moving averages and downstream strategy results.
• The report concerns a single stock example and provides no raw data or independent verification.
• Price-history validation should account for adjustment conventions before indicators or backtests are trusted.

Tags

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