Invisible ink: what an AI summary leaves out of an annual report

The most useful warning about AI summarisation is also the least dramatic: a summary is an argument about what matters. Every summary you have ever skimmed — a friend’s paragraph, a fund’s factsheet, a model’s tidy answer — was produced by something that decided what to keep. Language models make that decision quickly, fluently and invisibly, which is exactly why the result feels like the document instead of like an opinion about it.

This note lists what the compressor tends to throw away when the document is an annual report. Nothing here is secret; all of it is easy to forget at eleven at night, with a dim laptop and a strong opinion forming.

Condition words get smoothed first

Filings are written in qualifications: “subject to regulatory approval”, “assuming current demand”, “in the absence of further disruption”. Summaries compress clauses into statements, and a conditional three-line plan becomes a definite one. When a model restates a company’s outlook, read the original paragraph beside it on the page; the words if, subject to and depending on carry the difference between a roadmap and a wish.

Negative disclosures travel in silence

Annual reports disclose bad possibilities in a calm register — litigation contingencies, going-concern language, covenant conditions, restatement explanations, risk sections that quietly changed a sentence from last year’s edition. Because these passages read as boilerplate, summarisers rank them as low-signal and drop them with a clear conscience. A working habit: before accepting any summary, ask the model to list every risk-related passage it chose not to include, with page numbers. Then open those pages yourself.

Numbers lose their anchors

A model restating “revenue grew strongly” has erased three things at once: the period the statement covers, the unit it counts in, and whether the growth is year-on-year, quarter-on-quarter, or against a guidance figure the company set for itself. Extraction keeps anchors; summary melts them. Where a figure will influence a decision, pull it as a verbatim quote with the reporting period and the currency attached, and store the quote rather than the paraphrase.

Footnotes do the carrying

In many filings the honest sentences live at the bottom of the page in a smaller font: the accounting policy behind the headline number, the definition of “adjusted”, the related-party detail. Summaries of the body text do not summarise the footnotes. A note worth keeping near your desk: the larger the headline, the smaller the type that qualifies it.

What the desk does about it

Two rules cover most of the damage. First, a summary is a map, never the territory: anything that changes how you feel about a company gets checked against the exact page before it changes how you act. Second, ask for what summarisers call elision — an explicit list of what was left out and why — because the request forces the omission into daylight, where you can argue with it.

Both rules cost minutes. The alternative costs more: a portfolio built on documents you never actually read, summarized by a process you never actually audited.