Footnote diffs, and why "immaterial" is worth reading
The notes are where the accounting actually happens. The diff is where the changes to it show up.
What it measures
A structural comparison of this filing’s footnotes against the prior comparable filing: text added, removed and reworded, section by section.
The diff itself is computed. The materiality rating on each change — high, medium or low — is the one AI judgment in this feature, and it is labeled as such.
Changes in accounting policy, segment definitions, revenue recognition, contingencies and subsequent events are surfaced first, because those are the notes where a change alters what the numbers mean.
A revision is flagged however the company characterizes it. The engine is tuned against a real case in which management described a $151M expense understatement as immaterial.
How to read it
Materiality ratings are a reading order, not a verdict. They tell you what to look at first on a filing that may have hundreds of small edits.
| Range | What it suggests |
|---|---|
| High | Changes the meaning of a reported figure or a policy |
| Medium | Substantive, but narrower in effect |
| Low | Wording, formatting, or routine updating |
What it does not tell you
The part most tools leave out. A score you over-trust is worse than no score.
- A diff can only compare against a filing that exists. A first filing after an IPO has nothing to diff against.
- Restructured documents produce noisy diffs. A company that reorganized its notes will show large changes that are purely presentational.
- The materiality rating is a judgment and can be wrong. Every rated change carries the passage it came from so you can disagree with it.
- Absence of a flagged change is not assurance. Something can be wrong in a note that did not change since last year.