Form 10-K: The Annual Report the SEC Requires
The 10-K is the comprehensive annual filing that public companies submit to the SEC, containing audited financials, a description of the business, risk factors, and management's discussion — far more complete than the glossy shareholder letter.
EDGAR form codes: 10-K 10-K/A 10-KSB
What Is Form 10-K?
Form 10-K is the SEC's required annual report for publicly traded companies. It is the most detailed, legally vetted document a company produces, covering its business, financial condition, results of operations, risks, and governance. Every company whose securities are registered with the SEC must file one within a set number of days after the end of its fiscal year.
The form is filed online through EDGAR (the SEC's database). You can find it for any public company by searching for its ticker and selecting the filing type "10-K" or "10-K/A" (amendment). Smaller companies may use "10-KSB" or scaled disclosure rules, but the core structure is similar.
What's Inside: Key Items to Know
The 10-K is organized into numbered items. The most important sections are:
Item 1 (Business) – Describes what the company does, its products, markets, competition, customers, and regulatory environment. This is the place to start for understanding the company’s operations.
Item 1A (Risk Factors) – A list of the most significant risks the company faces, ranging from industry headwinds to litigation to cybersecurity. Although much of it is boilerplate, careful readers find risks that are specific and material; these are often the first things that can go wrong.
Item 7 (Management's Discussion and Analysis of Financial Condition and Results of Operations, or MD&A) – Management explains why the numbers changed from the prior year, what trends matter, and what uncertainties exist. This is often the most insightful section because it is written in plain English and focuses on the story behind the financials.
Item 8 (Financial Statements and Supplementary Data) – The audited balance sheet, income statement, cash flow statement, and notes. The notes are critical and sometimes contain more detail than the numbers themselves.
Why Risk Factors (Item 1A) Are Worth Reading
Yes, risk factors are often formulaic and padded with standard warnings like "we may be adversely affected by global economic conditions." But the SEC requires companies to disclose risks that are specific and material to their business. The real value lies in the risks that are unique to the company: a key customer contract expiring, a patent challenge, dependence on a single supplier, or a regulatory change that could upend the business model.
A good trick: skim the first few bullet points under each major risk header. If a risk is listed early, it is likely the one management is most worried about. Also look for changes from the prior year's 10-K — new risks often signal a real shift in the company’s exposure.
How the 10-K Differs from the Glossy Annual Report
Many companies also publish a polished, well-designed annual report (often called the "annual report to shareholders" or a "shareholder letter") that they mail or post online. That report may include a CEO letter, photos, and summaries, but it often omits negative details, obscures financial footnotes, and is not audited. The 10-K, by contrast, is a legal filing audited by an independent accountant. It contains the full financial statements, all footnotes, and mandatory disclosures about litigation, executive compensation, and related-party transactions.
The glossy report is marketing; the 10-K is the truth (as far as SEC rules require). The two can differ significantly in tone and content. Always rely on the 10-K for a complete picture.
Filing Deadlines by Company Size
Deadlines depend on the company's "public float" — the market value of shares held by the public (not by insiders) calculated at the end of its second fiscal quarter:
Large accelerated filer (public float ≥ $700 million): file within 60 days after fiscal year-end.
Accelerated filer (public float ≥ $75 million but < $700 million): file within 75 days.
Non-accelerated filer (public float < $75 million): file within 90 days.
Smaller reporting companies (often using scaled disclosure) follow the non-accelerated deadline. The 10-KSB form was historically used by small business issuers but has been largely replaced by scaled disclosure within the standard Form 10-K; however, some older filings or certain issuers may still refer to 10-KSB.
Amendments: 10-K/A
A 10-K/A is an amendment to a previously filed 10-K. Companies file it to correct errors, update information (e.g., after a merger), or add a missing signature. An amendment may also be triggered by an SEC comment letter that requires changes. If you see a 10-K/A, focus on the revised sections; the original filing's cover page will note which items have been changed.
Common questions
Where can I find a company's 10-K?
All 10-Ks are filed on the SEC's EDGAR system. You can search by company name or ticker at sec.gov/edgar. Most companies also post their 10-K on their investor relations website, but EDGAR is the official source.
Is the 10-K the same as the annual report mailed to shareholders?
No. The glossy annual report (often called the "annual report to shareholders") is not a legal filing and is not audited. The 10-K is the legal version, with audited numbers, full footnotes, and risk disclosures. Companies may combine the two in one document (the 10-K can be printed and mailed), but they are not the same in completeness or tone.
What should I look at first in a 10-K?
Start with Item 7 (MD&A) for management's explanation of performance. Then read Item 1A (Risk Factors) for what could go wrong. Then go to Item 8 (Financial Statements) — specifically the notes, which often contain crucial details about debt, revenue recognition, and lawsuits.
Why do some 10-K filings look much shorter than others?
Smaller reporting companies (with public float under $250 million or annual revenue under $100 million) can use scaled disclosure rules that let them omit certain items or use simpler language. These are sometimes filed as "10-K" but with less detail. Also, companies in certain industries (e.g., shell companies) may have very short filings.
What does 10-KSB mean?
10-KSB was a separate form for small business issuers under Regulation S-B. It allowed less detailed reporting. Since 2008, the SEC has largely replaced it with scaled disclosure inside the regular Form 10-K for companies that qualify as smaller reporting companies. You may still see 10-KSB filings from legacy filers, but most smaller companies now file a standard 10-K with scaled items.
Reference material, written with AI assistance and based on SEC rules and filing practice. Informational only, not investment or legal advice. Filing requirements change — check the SEC's own guidance for anything consequential.