Why Adjusted Stock Closes Differ From Market Prices

Summary

The note explains why a stock’s closing price shown on a quantitative trading platform can differ substantially from the price shown by a brokerage or market-data app. The platform adjusts historical price data to account for corporate actions, so the displayed close may not be the unadjusted market close.

For the cited A-share daily data, close is a backward-adjusted price. Dividing it by the adjustment factor produces the original price. This distinction matters when comparing platform data with quoted market prices or interpreting historical values in a strategy workflow. The note gives no worked example or further detail about adjustment conventions, so users should check the platform’s field definitions and factor methodology before applying the conversion to other datasets.

Key ideas

• A platform’s displayed close can be adjusted rather than the raw market closing price.
• The cited A-share daily close uses backward adjustment.
• Dividing the adjusted close by its adjustment factor recovers the original price, according to the note.

Tags

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