What Is a 10-K?
A 10-K is the annual report every US public company is required to file with the Securities and Exchange Commission. Unlike the glossy annual report mailed to shareholders, the 10-K is a standardized legal document with mandated sections and audited financial statements.
Large accelerated filers must submit it within 60 days of fiscal year-end, with smaller companies getting up to 90 days. All filings are freely available on the SEC's EDGAR database.
What's Inside
The core sections include Item 1 (Business), which describes what the company actually does; Item 1A (Risk Factors), which lists everything that could go wrong; Item 7 (Management's Discussion and Analysis, or MD&A), where management explains the year's results; and Item 8, the audited financial statements and footnotes.
The footnotes are where much of the real information lives, covering debt maturities, lease obligations, segment results, revenue recognition policies, and pending litigation. Experienced analysts often read the footnotes and MD&A more carefully than the headline numbers.
10-K vs. 10-Q vs. Annual Report
The 10-Q is the quarterly sibling of the 10-K: filed three times a year, less detailed, and with unaudited financials. The shareholder annual report is a marketing-oriented document, while the 10-K is the rigorous regulatory filing; for serious analysis, the 10-K is the source of record.
Foreign companies listed in the US file a 20-F instead, which serves a similar purpose.
Why It Matters
If you want to genuinely understand a company, reading its 10-K is the highest-return exercise there is, and it is exactly what analysts at banks and investment funds do daily. Investment banking analysts pull comps data, capitalization details, and segment breakdowns straight from 10-Ks when building pitch books and models.
Mentioning specific things you learned from a company's 10-K is also one of the easiest ways to stand out in a finance interview.
