What is a Form 4 filing? SEC insider trades (2026)
A Form 4 filing is a report that company insiders file with the US Securities and Exchange Commission (SEC) when they buy or sell their own company's stock. It answers one narrow question: which insider traded, how many shares, at what price, and on what date. It is filed fast, within two business days, so it is one of the most current disclosures on US markets.
Definition
A Form 4 filing
is an SEC disclosure that a company's officers, directors, and holders of more than 10 percent of its stock must file within two business days of trading that stock. It reports the date, share count, price, and transaction type. It shows what an insider did, not why. Source: SEC EDGAR.
Who has to file a Form 4?
The requirement comes from Section 16(a) of the Securities Exchange Act. Three groups of "insiders" are covered:
- Officers of the company, such as the CEO and CFO
- Directors on the board
- Beneficial owners of more than 10 percent of any class of the company's equity
When any of them trades the company's stock, the transaction has to be reported on a Form 4.
2 business days
Deadline to file a Form 4 after an insider transaction
Source: SEC, Section 16 of the Securities Exchange Act
What a Form 4 shows, and what it hides
A Form 4 is useful because it is fast and it comes straight from the insider under a legal obligation. But it is a single data point, and reading it well means knowing its edges.
What it includes:
- The insider's name and their relationship to the company
- The transaction date
- The number of shares bought or sold
- The price per share
- A transaction code (for example, a code for an open-market purchase or sale)
- The insider's remaining holding after the trade
What it leaves out:
- The reason for the trade
- Whether a sale was pre-scheduled under a trading plan
- Any position outside that one company
How to read a Form 4 without over-reading it
Treat a Form 4 as a fact, not a signal. A few practical points:
- Check the transaction code. An open-market purchase reads differently from an option exercise or a pre-planned sale.
- Look at the size relative to the holding. A trade that moves a small fraction of a large stake means something different from one that clears most of it.
- Read several filings, not one. A pattern across dated filings is more informative than a single trade.
- Follow the source. Every Form 4 is public on SEC EDGAR, so anything you rely on can be verified at the primary source.
Insider disclosure is not unique to the US. India runs its own regime under SEBI insider-trading disclosure rules. For the quarterly institutional view rather than the insider view, see what a 13F filing is. And for the step-by-step, how to track insider buying walks through the process.
Flock reads primary filings like these, stamps each one with its filing date, and links back to the original source. What the data means for you is your call to make.
Frequently asked questions
Who has to file a Form 4?
Company officers, directors, and any beneficial owner of more than 10 percent of a class of a company's equity must file a Form 4 when they trade that company's stock. The obligation comes from Section 16(a) of the Securities Exchange Act. Source: SEC EDGAR.
How quickly must a Form 4 be filed?
Within two business days of the transaction. This is a hard deadline. A Form 4 filed on the third business day is a late filing, and late filings must be disclosed in the company's proxy statement. Source: SEC, Section 16.
What is the difference between a Form 4 and a 13F?
A Form 4 reports a single insider's trade in their own company's stock within two business days. A 13F reports a large manager's full US equity holdings once a quarter, up to 45 days after quarter-end. Different filers, different speed. Source: SEC EDGAR.
Does a Form 4 show why an insider traded?
No. A Form 4 records the transaction, the date, the number of shares, the price, and a code for the transaction type. It does not state the insider's reason. Reading intent into a single filing is guesswork. Source: SEC.
Flock tracks these filings, sourced, dated, and linked back to the original. See what smart-money entities disclosed, without the guesswork about what it means.
Disclosures shown are public regulatory filings. Data may be delayed or incomplete. Smart-money entities may no longer hold positions shown. Not investment advice.