Can past grades be changed later?
Using MaegimLast updated
No. Maegim follows an immutable-history principle that forbids retroactive edits to past grades. Once a grade is produced and recorded, it is never rewritten — even after the formula improves. We believe grade credibility requires that repainting the past to look better be structurally impossible.
Instead, when the formula changes, the methodology version and a summary of the change are announced, and grades produced from that point on carry the new version label. Each stock's history shows its past grade changes and reason types exactly as they occurred.
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