Form 10-K

Form 10-K is the annual report a company with registered securities files with the SEC under Section 13 or 15(d) of the Securities Exchange Act of 1934. The rule that prescribes it, 17 CFR 249.310, says the form "shall be used for annual reports pursuant to sections 13 or 15(d) of the Securities Exchange Act of 1934 ... for which no other form is prescribed," and also for transition reports when a company changes its fiscal year end. In ordinary use it is called the 10-K, and the official title is worth knowing only because it explains what the document is for: it is the annual installment of a filing obligation, not a communication to shareholders. The document a company mails its shareholders with the proxy statement is a different one with a different legal status, the annual report to security holders, and the two can contain the same words while carrying different weight.

The deadline is not one deadline. Section 249.310(b) sets three, keyed to the filer categories defined in 17 CFR 240.12b-2: 60 days after the end of the fiscal year covered for a large accelerated filer, 75 days for an accelerated filer, and 90 days "for all other registrants." A separate paragraph lets a company file the Article 12 financial statement schedules as an amendment up to 30 days after the report's own due date. So the same calendar year end produces three different filing dates across the market, and a smaller company's report legitimately arrives a month after a large one's.

Filed versus furnished, which is the distinction that gives this document its legal character. Exchange Act Section 18, 15 USC 78r(a), is headed "Liability for misleading statements" and reaches "any statement in any application, report, or document filed pursuant to this chapter or any rule or regulation thereunder" that was, at the time and in the circumstances, "false or misleading with respect to any material fact." A person who bought or sold "in reliance upon such statement ... at a price which was affected by such statement," and who did not know it was false or misleading, may recover damages caused by that reliance, "unless the person sued shall prove that he acted in good faith and had no knowledge that such statement was false or misleading." Section 18(c) shortens the window considerably: an action must be brought within one year after discovery of the facts and within three years after the cause of action accrued, so whichever limit runs out first ends the claim. That is a narrow action. It requires actual reliance on the specific statement, a price effect, and a filed document.

What "furnished" changes, and what it does not. Form 8-K's General Instruction B.2 provides that information in a report furnished under Item 2.02, results of operations and financial condition, or Item 7.01, Regulation FD disclosure, "shall not be deemed to be 'filed' for purposes of Section 18 of the Exchange Act," and is not otherwise subject to that section's liability provisions, "unless the registrant specifically states that the information is to be considered 'filed' under the Exchange Act or incorporates it by reference into a filing under the Securities Act or the Exchange Act." Rule 14a-3(c) does something similar for the annual report to security holders. Read alone, those provisions invite a wrong conclusion. The SEC closes it expressly: in a 2026 release the agency stated that Regulation G, 17 CFR 229.10, and "the antifraud provisions of the Federal securities laws (such as Exchange Act Section 10(b) and 17 CFR 240.10b-5 (Exchange Act Rule 10b-5)), apply to earnings releases and earnings guidance." So the accurate formulation has two halves. Section 18's private, reliance-based damages action attaches only to filed documents. Antifraud liability under Section 10(b) and Rule 10b-5 attaches either way, and what that requires is the subject of insider trading and securities fraud rather than of this page.

Where the substance of the document actually is. The 10-K carries the audited financial statements, management's discussion and analysis of results and liquidity, the risk factors, the description of the business and its properties, legal proceedings, and the disclosures about market risk. Every filed 10-K is available free on the SEC's EDGAR system, and a shareholder who was solicited can also demand a paper copy without charge under the undertaking the proxy rules require in the annual report to security holders.

One live proposal, stated as a proposal. Interim reporting is currently quarterly. Form 10-Q is required under 17 CFR 249.308a and 240.13a-13, and the 10-K covers the fourth quarter, a point that earnings season carries. In May 2026 the SEC proposed amendments "to allow companies to file semiannual reports on new Form 10-S in lieu of quarterly reports on Form 10-Q to meet their interim reporting obligations under the Securities Exchange Act of 1934," with comments due July 6, 2026. As of September 4, 2026 that proposal has not been adopted, so quarterly reporting remains the requirement and Form 10-S does not exist. The same release states that the proposal makes no general change to the rules governing earnings releases or guidance practices.

A company's fiscal year ends. It closes its books, its auditor completes the audit, and the company assembles the form's items. It files on EDGAR by the deadline for its filer status, with the officers' certifications the Sarbanes-Oxley rules require. The filing becomes public immediately. Where the company has prepared an integrated report, the same document can satisfy both this obligation and the proxy rules' obligation to send shareholders an annual report.

A worked example, using the filing calendar because the arithmetic is what trips people up. A company's fiscal year ends December 31, 2026. Count forward from that date. Thirty-one days reaches January 31, 2027; another 28 reaches February 28, 2027, which is day 59; the next day, March 1, 2027, is day 60. So a large accelerated filer's deadline is March 1, 2027. An accelerated filer gets 75 days, which is 15 days further on, or March 16, 2027. Every other registrant gets 90 days, which is March 31, 2027, since March 1 is day 60 and March 31 is day 90. Three companies with identical year ends therefore have deadlines a month apart, and a reader waiting on a small company's numbers in early March is waiting for a report that is not yet late.

Pros

• It is audited and filed, so it is the most reliable single document a company publishes about itself.
• Being filed brings it inside Exchange Act Section 18, which gives a purchaser or seller who actually relied on a false statement a damages action.
• It is free on EDGAR, with no account, subscription or request needed.
• It is comprehensive by rule rather than by choice, covering risk factors, legal proceedings and market-risk exposures a shorter document can skip.

Cons

• It arrives 60 to 90 days after the year it describes, so the numbers are already old when they are published.
• Section 18's action is narrow. It requires reliance on the specific statement and a price effect, and it carries a good-faith defense and a one-year discovery limit.
• The document is long and written for a professional reader, which is why the glossy report exists alongside it.
• Reading only the 10-K misses everything the company said between filings, including the earnings releases and calls that move prices.