What Is an SEC Filing? 10 Types of SEC Filings Explained

An SEC filing is a formal disclosure document that public companies, corporate insiders, and institutional investors submit to the U.S. Securities and Exchange Commission (SEC). These documents report financial performance, material corporate events, and ownership changes. Every SEC filing is publicly available at no cost through the SEC's EDGAR database at sec.gov.

Key Takeaways

• An SEC filing is a mandatory disclosure document submitted to the U.S. Securities and Exchange Commission by public companies, insiders, and large institutional investors, and all filings are free to access through EDGAR at sec.gov.
• Form 10-K is the audited annual report, Form 10-Q is the unaudited quarterly report, and Form 8-K discloses material events between those reports, generally within four business days.
• Ownership filings track who is buying and selling: corporate insiders file Form 4 within two business days of a transaction, investors crossing 5% of voting shares file Schedule 13D or 13G, and institutional managers with at least $100 million in Section 13(f) securities file Form 13F quarterly.
• Foreign private issuers listed on U.S. exchanges file Form 20-F instead of Form 10-K, and may report under IFRS rather than U.S. GAAP.

Why Does the SEC Require Companies to File Disclosures?

The SEC requires these disclosures so that all market participants can access the same material information at the same time. The requirement rests on three functions.

Transparency means companies must report financial condition, business operations, and risk factors in standardized formats that allow comparison across filers. Accountability means executives personally certify the accuracy of financial statements under the Sarbanes-Oxley Act of 2002, creating legal liability for misleading disclosures. Fair access means retail investors read the same primary documents as institutional analysts at Goldman Sachs or Fidelity, because EDGAR publishes filings to everyone simultaneously.

10 Types of SEC Filings at a Glance

10 Types of SEC Filings

1. Form 10-K: Annual Report

Form 10-K is the comprehensive annual report that U.S. public companies file with the SEC. It contains audited financial statements, a detailed business description, risk factors, management's discussion and analysis (MD&A), and executive compensation disclosures.

Large accelerated filers, defined as companies with a public float of $700 million or more, must file the 10-K within 60 days of fiscal year end. Accelerated filers, with public float between $75 million and $700 million, have 75 days, and non-accelerated filers have 90 days. A company that cannot meet the deadline may file Form 12b-25, also called NT 10-K, for an automatic 15-day extension. The 10-K is the single most complete document a public company produces about itself.

2. Form 10-Q: Quarterly Report

Form 10-Q is the quarterly financial report that U.S. public companies file for each of the first three fiscal quarters. The fourth quarter is covered by the annual 10-K instead.

Unlike the 10-K, financial statements in a 10-Q are unaudited and reviewed rather than fully examined by an external auditor. Large accelerated and accelerated filers must submit the 10-Q within 40 days of quarter end, and non-accelerated filers within 45 days. The 10-Q shows revenue trends, margin movement, and cash flow at a higher frequency than the annual report.

3. Form 8-K: Current Report

Form 8-K is the filing companies use to disclose material events that occur between scheduled quarterly and annual reports. The default deadline is four business days after the triggering event, which makes the 8-K the fastest formal disclosure channel in U.S. equity markets. Some items run on different clocks: Item 5.07 shareholder vote results run from the meeting date, Item 1.05 material cybersecurity incidents run from the date the company determines the incident is material, and Item 7.01 Regulation FD disclosures require simultaneous or prompt release.

Events requiring an 8-K include completed mergers and acquisitions, bankruptcy or receivership, departure of directors or principal officers, changes in the certifying accountant, material definitive agreements, and material cybersecurity incidents under Item 1.05. Quarterly earnings releases are also filed as 8-Ks under Item 2.02. When a stock gaps sharply on news, an 8-K is usually the source document behind the move.

4. Form S-1: IPO Registration Statement

Form S-1 is the registration statement a company files with the SEC before selling shares to the public in the United States. It contains the prospectus, which sets out the business model, historical financial statements, risk factors, planned use of proceeds, and the mechanics of the offering.

The S-1 is often the first time a private company's full financials become public. Companies file amendments, labeled S-1/A, as underwriters and the SEC review the document, and the final pricing terms appear in a 424(b) prospectus.

5. DEF 14A: Proxy Statement

DEF 14A is the definitive proxy statement companies distribute to shareholders ahead of an annual or special meeting. It covers every matter subject to a shareholder vote, including board of director elections, ratification of the external auditor, executive compensation approval known as say-on-pay, and shareholder proposals.

When Part III of a company's Form 10-K incorporates information from the proxy statement by reference, the DEF 14A is due within 120 days of fiscal year end. The DEF 14A is the primary source for corporate governance information. It discloses board composition and independence, the compensation committee's reasoning, total executive pay packages in the Summary Compensation Table, and the CEO pay ratio.

6. Form 4: Statement of Changes in Beneficial Ownership

Form 4 reports transactions in company securities by corporate insiders, defined as officers, directors, and beneficial owners of more than 10% of a class of registered equity. Insiders must file within two business days of the transaction.

Form 4 discloses the transaction date, type, price, and share count, along with the insider's remaining holdings. Filings distinguish open-market purchases from sales executed under a pre-arranged Rule 10b5-1 trading plan, a distinction that matters because scheduled 10b5-1 sales carry less signal about management's current view than discretionary open-market buying. Transactions exempt from Form 4 reporting, or ones an insider failed to report on time, are disclosed on Form 5 within 45 days of fiscal year end.

7. Schedule 13D: Beneficial Ownership Report

Schedule 13D is the filing required when an investor acquires beneficial ownership of more than 5% of a company's voting shares and intends to influence control of the issuer. Following SEC amendments effective February 2024, the deadline is five business days after crossing the threshold, shortened from the previous ten calendar days.

Passive investors crossing the same 5% threshold file the shorter Schedule 13G instead, due within five business days. Qualified institutional investors and exempt investors file Schedule 13G within 45 days after the end of the quarter in which they cross 5%. Schedule 13D amendments are due within two business days of a material change. A 13D signals activist intent, so a filing from a fund such as Elliott Management or Starboard Value frequently moves the stock, because Item 4 of the schedule requires the filer to state its purpose, including any plan to seek board seats, a sale of the company, or a change in capital structure.

8. Form 13F: Institutional Holdings Report

Form 13F is the quarterly report filed by institutional investment managers exercising discretion over at least $100 million in Section 13(f) securities, primarily U.S.-listed equities. The filing deadline is 45 days after the end of the calendar year and 45 days after each of the first three calendar quarters of the following year. Once the threshold is crossed, four filings are required even if holdings later fall below $100 million.

Because the data reflects positions as of quarter end and appears up to 45 days later, 13F holdings are backward-looking. The form also excludes short positions, most non-U.S. holdings, and open-end mutual fund shares, though exchange-traded funds are reportable. For a full breakdown of what these reports disclose and how to read them, see the dedicated guide to 13F filings.

9. Form 144: Notice of Proposed Sale of Securities

Form 144 is the notice an affiliate files when planning to sell restricted or control securities under Rule 144. The filing is required when the intended sale exceeds 5,000 shares or $50,000 in aggregate value within a three-month period.

Form 144 is filed at or before the time the sell order is placed, while Form 4 reports the completed transaction afterward, so a Form 144 can serve as an early indication that an affiliate intends to reduce a position. Non-affiliates who have satisfied the applicable Rule 144 holding period are exempt from filing. Since April 13, 2023, Forms 144 covering securities of reporting companies must be filed electronically on EDGAR.

10. Form 20-F: Annual Report for Foreign Private Issuers

Form 20-F is the annual report filed by foreign private issuers listed on U.S. exchanges, serving the same function as the 10-K for domestic companies. Filers must submit the 20-F within four months of fiscal year end.

Financial statements in a 20-F may be prepared under International Financial Reporting Standards (IFRS) rather than U.S. GAAP. Companies including Alibaba Group (NYSE: BABA), ASML Holding (Nasdaq: ASML), and Toyota Motor Corporation (NYSE: TM) report annually on Form 20-F rather than Form 10-K.

Common Misconceptions About SEC Filings

"A 13F shows what a fund owns right now." No. 13F data reflects positions as of quarter end and can appear up to 45 days later, so the holdings may already have changed. It also excludes short positions, so a reported long position does not reveal a fund's net exposure.

"Every insider sale is a bearish signal." Not necessarily. Many insider sales are executed under pre-arranged Rule 10b5-1 trading plans scheduled months in advance, which carry far less signal about management's current view than a discretionary open-market transaction.

"An SEC filing means the SEC has approved or endorsed the company." No. The SEC reviews filings for disclosure compliance but does not vouch for the accuracy of the contents or the merit of the securities. Responsibility for accuracy rests with the company and its executives.

"8-Ks are just earnings announcements." Earnings releases are only one trigger, filed under Item 2.02. The 8-K covers dozens of material events, from executive departures and mergers to bankruptcy and cybersecurity incidents.

How Can Investors Access SEC Filings?

Every SEC filing is available free of charge through EDGAR at sec.gov. Investors can search by company name, ticker symbol, central index key (CIK), or form type, and EDGAR full-text search indexes the complete body text of filings, including exhibits, back to May 2001. Companies also republish their filings in the investor relations section of their corporate websites.

On Backpack, each stock page includes a Filings tab that lists a company's SEC submissions by date and form type, with filters for reports, ownership filings, and other documents, and a link out to each filing. Insider transactions reported on Form 4 also appear under a dedicated Insider tab.