Japan: reconcile corrected exchange data before comparing figures

AI-assisted Stockatlass editorial. Educational information, not investment advice. A corrected dataset can leave a research worksheet using two versions at once. Before interpreting a change, check whether the underlying source has changed as well. Tokyo Stock Exchange published a correction notice on 22 October 2026 after finding errors in previously released margin-trading balances. It identified balances for stocks subject to daily disclosure for applications dated 20 October, and stock-by-stock balances for applications dated 19 and 20 October. The notice links to the corrected data. Its publication date and the application dates describe different things; neither should silently replace the other in a worksheet. Our suggested reconciliation method begins with a short version log. Record the dataset name, original source link, relevant application date, retrieval date and correction notice. Identify which rows and fields your existing analysis actually used. Do not assume every value changed simply because a source was corrected. Next, compare the affected entries using the same security identity, field definitions and units. If you previously calculated a total, ratio or comparison from those entries, mark it for review and recalculate from a consistent version. Avoid combining a revised figure with an unrevised figure without explaining the difference. Keep a record of which version supported an earlier conclusion and label the updated conclusion clearly. If you cannot reconcile an entry, leave the question open rather than guessing the replacement value. These are Stockatlass research suggestions, not additional exchange requirements. This notice provides a practical example of checking data provenance. It does not, by itself, establish a current market position, explain a share-price move or justify an investment decision. Sources checked: 2026-10-23 (Asia/Kolkata).