How to Read a 10-K: The Six Sections That Matter

A 10-K is the comprehensive annual report every US public company must file with the SEC within 60 to 90 days of the end of its fiscal year. It is the single most authoritative source of information about a company — audited financials, business description, risks, management discussion, the entire picture.

Crucially, 10-Ks are filed under legal liability. A misstatement in a press release is embarrassing. A misstatement in a 10-K can put executives in federal prison. The result: 10-K language is precise, conservative, and unusually honest about risks — because there is no upside to spinning them.

Find any 10-K free on the SEC's EDGAR system (sec.gov/edgar). Type the ticker, click '10-K' under filings, open the most recent one.

Section 1 — 'Business' — describes what the company actually does. For a company you already know well, skim it. For a new investment idea, read it carefully — including the segments, the geographic breakdown, the competitive landscape, and the regulatory environment.

Pay attention to how the company describes its own business. Is it focused, or sprawling? Is the language confident and specific, or vague and aspirational? Companies that struggle to explain what they do in plain language often struggle to execute as well.

This is the section professional investors read first. By law, the company must disclose every material risk — and lawyers ensure nothing significant is left out.

Look for risks that appear new compared to last year's 10-K (regulators do not require a diff, but you can run one yourself by comparing sections). Look for risks that have moved up in priority. Look for unusually specific risks — vague risks ('the economy may worsen') are boilerplate; specific risks ('our largest customer represents 31% of revenue and could choose to in-source production') are real.

If a risk factor reads like the entire investment thesis falling apart, take it seriously. The lawyers who wrote it did.

MD&A is management's own narrative explanation of the year's financial results. This is where you learn how the company thinks about its own business — what drove revenue, what compressed margins, what they are betting on next year.

Compare MD&A to last year's MD&A. Are management's priorities consistent? Did they hit the targets they set? When they explain a miss, is the explanation specific and credible — or is it always 'macroeconomic headwinds'?

MD&A is the best place to find the gap between what management says publicly (in earnings calls and press releases) and what they will say under legal liability. The gap, when it exists, is informative.

Three statements matter: the income statement (revenue, expenses, net income), the balance sheet (assets, liabilities, equity), and the cash flow statement (operating, investing, financing cash flows).

Start with the cash flow statement, not the income statement. Net income can be manipulated within accounting rules; cash is harder to fake. A company with rising net income and falling operating cash flow is a red flag — almost always means earnings are being inflated by accounting choices.

On the balance sheet, watch for goodwill (acquisitions that may need to be written down), inventory build-up (signal of slowing sales), and rising accounts receivable relative to revenue (signal of looser credit terms or channel stuffing).

This is the legal disclosure about whether the company's accounting systems are reliable, plus the independent auditor's opinion on the financial statements.

You want to see a clean opinion: 'present fairly, in all material respects.' Anything else — a 'qualified' opinion, a 'going concern' warning, or a disclosed material weakness — is a serious red flag that warrants pausing before investing.

Bonus: check Item 9 for any change in auditor during the year. Auditor changes can be routine, but they can also signal a disagreement over accounting treatment. The 8-K filing that announced the change will explain why.

How is the CEO paid? Is compensation tied to long-term metrics (multi-year revenue growth, return on capital, total shareholder return) or short-term ones (annual earnings, hitting a single year's target)? Short-term-heavy comp incentivizes short-term decisions.

Look at the ratio of CEO pay to median employee pay (disclosed since 2018). Look at insider ownership — executives who own meaningful equity tend to behave more like owners than mercenaries.

This section also reveals related-party transactions — loans to executives, business done with companies owned by board members. These are not always bad, but they deserve scrutiny.