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Not investment advice. Educational reading. See Disclaimer.
L.1 · INTERMEDIATE · 2 MIN

The 10-K: A Field Guide to the Annual Report

A 10-K is the most information-dense document a public company produces all year. Most investors skim the headline numbers and never open the filing. Practitioners read it differently: as a *diff* against last year's 10-K, with attention to what was newly added, what was quietly removed, and where the narrative softens or sharpens.

Quiz · 5 questions ↓
§ 01

The four high-signal subsections to read first: (1) Item 1A Risk Factors — read the diff, not the count; (2) Item 7 MD&A — read for what is not said as much as what is; (3) Critical Accounting Policies — where the most judgmental numbers come from; (4) Subsequent Events — anything material that happened after fiscal year-end but before filing date.

§ 02
SectionTypeWhy it matters
Item 1 BusinessManaged narrativeSegment splits and customer concentration are usually here
Item 1A Risk FactorsLegally curatedNew bullets often surface litigation or regulation before MD&A admits it
Item 3 Legal ProceedingsRegulated disclosureRead in conjunction with the contingencies footnote
Item 7 MD&AManaged narrativeWhat is left out is often more revealing than what is said
Item 8 Financial Statements + NotesAudited disclosureFootnotes are typically more reliable than narrative — auditors signed them
Critical Accounting PoliciesAudited disclosureWhere the judgmental numbers live (reserves, fair-value Level 3, impairments)
§ 03

Worked example — Pelham Holdings 2025 10-K: Item 1 shows the water-treatment segment is now 23% of revenue, up from 14%. Item 1A adds a new bullet on "potential liability under federal PFAS regulations," with no dollar quantification but a reference to a pending EPA notice. Item 3 lists three new municipal-water class actions filed in the past 18 months. Item 7 narrative says PFAS exposure is "manageable" but does not quantify. Item 8 contingencies footnote shows no PFAS reserve. The risk is acknowledged in Items 1A and 3 but not yet quantified in Item 8 — either Pelham does not yet have an estimable liability, or it is under-reserving. Either way, this is a known unknown that should drive a discount.

§ 04
Pull a recent 10-K for any company you own. Open last year's 10-K side by side. Read only the Risk Factors diff — what is new, what was removed, what was sharpened. Five minutes; you will see the year more clearly than any earnings call.
§ 05
A 10-K's MD&A says revenue grew because of "strong customer engagement and favorable mix." The same paragraph last year said growth came from "new product launches and pricing." What is the most likely interpretation?
§ 06

The footnotes are usually more reliable than the narrative. Auditors signed the footnotes. Lawyers wrote the Risk Factors. Marketers helped with MD&A. Read in that order: Item 8 first, then Item 1A, then MD&A — and treat MD&A as a press release that happens to be inside a regulatory filing.

Five questions · AI feedback

Sit with the ideas.

Halton Industries' 10-K Risk Factors section grew from 2,100 words to 4,600 words year-over-year, with fourteen new bullet points added. What is the most defensible reading?

Why:
Try this in paper trading

Read the MD&A. Then buy.

Pull the most recent 10-Q for a company on your watchlist. Read just the Management's Discussion & Analysis section. Note one risk management explicitly flagged. Paper-buy with a thesis that acknowledges that risk.

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Practice mode — simulated trades, not investment advice.

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