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SEC filings in plain English: 10-K, 10-Q, 8-K, S-3 and 13D

What the main SEC filings are, which ones usually matter for a stock and which are routine, and how to find the important part of each in minutes.

By Ticker Council · November 12, 2026

Every US-listed company files a steady stream of documents with the SEC. Most of them are routine. A few can change the story of a company overnight. Knowing which is which saves a lot of reading.

All of them are free on the SEC's EDGAR website: search the company, open "Filings", and filter by form type.

The regular reports

10-K: the annual report

The full-year picture: what the business does, audited financial statements, and a long Risk Factors section. Two parts are worth most of your time:

10-Q: the quarterly report

A lighter, unaudited update three times a year. Check revenue and profit against the same quarter last year, cash and debt, and any new legal proceedings.

The event filings

8-K: "something just happened"

Companies must file an 8-K within four business days of a significant event. The form lists items by number, and the item tells you what kind of news it is:

Most 8-Ks are routine (results, a scheduled meeting). Read the item numbers first, then decide whether to read the rest.

S-1 and S-3: new shares coming

A registration statement lets a company sell new shares (or let existing holders sell). An S-1 is the full version, often for an IPO; an S-3 is a shorter version for established companies. A new registration can mean dilution: more shares, each owning a smaller slice of the company. A "shelf" S-3 only says shares could be sold later; the follow-up prospectus says when and how many. See buybacks and dilution.

13D and 13G: a big holder appears

Anyone who comes to own more than 5% of a company's shares must disclose it. A 13G is for passive investors such as index funds. A 13D is for holders who may try to influence the company, so a new 13D from an activist investor is often news.

How to read filings efficiently

  1. Start with the list of recent filings and their form types. Most weeks there's nothing beyond routine paperwork.
  2. For an 8-K, read the item numbers first.
  3. For a 10-K or 10-Q, read MD&A and anything new in Risk Factors.
  4. Treat registrations (S-1, S-3) and new 13Ds as the filings most likely to matter.
  5. Don't read too much into a single routine filing.

How Ticker Council uses filings

The SEC Filings seat on Ticker Council reads only the stock's SEC filings: 8-Ks, S-1/S-3 registrations, 13D/G ownership filings and flagged buyback, dilution, debt, covenant and litigation items. It's told that most routine filings carry little signal, so it keeps its lean close to 50/50 when that's all there is, and leans with real confidence only on filings that change the company's structure, such as a new dilutive registration or a large buyback actually being carried out.

Not financial advice: this guide explains public filings, not what to buy or sell.

Questions

What is an 8-K filing?

A report a US-listed company must file with the SEC within four business days of a significant event, such as earnings results, a major agreement, an executive leaving or restated financial statements. The item numbers on the form tell you which kind of event it is.

What is the difference between a 10-K and a 10-Q?

A 10-K is the full annual report with audited financial statements. A 10-Q is a shorter, unaudited quarterly update filed for the other three quarters.

What does an S-3 filing mean for a stock?

It registers shares the company (or its holders) may sell. That can mean dilution, but a shelf S-3 only makes a sale possible; the follow-up prospectus says when and how many shares are actually sold.

Where can I read a company's SEC filings for free?

On the SEC's EDGAR website. Search for the company and filter its filings by form type.