Form 4 Explained: How to Read an Insider Trading Report
Educational content: This page explains SEC filing rules and how to read an insider disclosure. It is not investment advice or a recommendation to buy or sell securities. All trading has risk.
What is a Form 4?
A Form 4 is the SEC filing that reports a change in an insider's ownership of company stock. Officers, directors, and owners of more than 10% of a class of registered equity must file one. The deadline is the end of the second business day after the transaction. The form states the date, the transaction code, the number of shares, the price, and the shares the insider holds afterward. Anyone can read it for free on SEC EDGAR.
Who files, and when
Section 16 of the Securities Exchange Act sets the rules. Three groups file:
- Officers of the company
- Members of the board of directors
- Any person or entity with beneficial ownership of more than 10% of a registered class of equity
A Form 4 is due when the insider's beneficial ownership changes. Common triggers:
- An open market purchase or sale
- An exercise of stock options
- A grant or award of stock
- A gift of stock
- A conversion, such as preferred stock to common stock
- A trade by a trust or entity that the insider controls
Three forms cover Section 16 reports:
| Form | Purpose | Deadline |
|---|---|---|
| Form 3 | First report when a person becomes an insider. No transaction. | 10 days after the person becomes an insider |
| Form 4 | Report of a change in ownership | End of the second business day after the transaction |
| Form 5 | Annual report of small or deferred transactions that Form 4 does not cover | 45 days after the end of the fiscal year |
The trade always happens before the filing. You read a Form 4 after the fact.
The sections of a Form 4
Reporting person. The insider's name, address, and relationship to the company. The form has check boxes for director, officer, 10% owner, and other. One person can check more than one box. An officer who also sits on the board sees both the operations and the board discussions.
Issuer. The company name, the ticker symbol, and the CIK. The CIK is the SEC identifier for the company.
Table I - non-derivative securities. The main table. It holds the actual stock transactions. The columns are:
| Column | Content |
|---|---|
| Security title | The type of security, most often "Common Stock" |
| Transaction date | The date of the trade |
| Transaction code | One letter for the type of transaction |
| Shares | The number of shares |
| Price per share | The price the insider paid or received |
| Shares owned after | The total the insider holds after the trade |
| Ownership form | Direct (D) or indirect (I) |
A row reads like this:
Common Stock | 2024-03-15 | P | 10,000 | $42.50 | 110,000 | D
That row says the insider bought 10,000 shares on 15 March 2024 at 425,000. The insider now holds 110,000 shares directly, up from 100,000.
Table II - derivative securities. Options, warrants, and convertible notes appear here. These instruments convert into stock. An option exercise (code M) appears in Table II. The shares that result appear in Table I.
Footnotes. Read them. The footnotes explain the parts of the form that the columns cannot hold: whether a Rule 10b5-1 plan covered the trade, who owns the shares that the insider reports as indirect, the terms of an option, and the reason for a tax withholding.
Transaction codes
The code is one letter. It tells you how the shares changed hands.
| Code | Meaning | Insider chose it | Insider used own money |
|---|---|---|---|
| P | Open market purchase | Yes | Yes |
| S | Open market sale | Yes | n/a |
| A | Grant or award from the company | No | No |
| M | Exercise of a derivative security | Yes | Pays the strike price |
| F | Shares withheld for taxes or exercise cost | No | No |
| D | Sale back to the issuer | Sometimes | n/a |
| G | Gift | Yes | No |
| C | Conversion of a convertible security | Sometimes | No |
| J | Other acquisition or disposition | Varies | Varies |
| I | Discretionary transaction in a 401(k) or similar plan | Yes | Yes |
Insider Transaction Types covers each code with examples.
Direct and indirect ownership
The ownership column holds a D or an I.
Direct (D) means the insider holds the shares personally, such as in an individual brokerage account.
Indirect (I) means an entity holds the shares, and the insider has a financial interest in that entity. Family trusts, a spouse's account, an LLC, and a 401(k) are common examples. A footnote explains the relationship:
(2) Shares held by the Smith Family Trust. The reporting person is trustee
and has sole voting and investment power.
Both forms count toward beneficial ownership. The SEC treats the insider as the beneficial owner in both cases.
Rule 10b5-1 plans
An insider can adopt a written trading plan in advance. The plan fixes the amounts, prices, and dates. A broker then executes the trades without further input from the insider. The plan gives the insider an affirmative defense against an insider trading charge.
The SEC amended Rule 10b5-1 in December 2022. The amendments added cooling-off periods. A director or officer must wait until the later of 90 days after adoption or two business days after the company discloses the financial results for the quarter of adoption. The wait never exceeds 120 days. Other people must wait 30 days. The rules also require directors and officers to certify that they hold no material non-public information when they adopt the plan.
A Form 4 shows the plan in a check box and usually in a footnote:
(1) Shares sold pursuant to a Rule 10b5-1 trading plan adopted on
June 1, 2023.
That footnote tells you the insider set the trade months earlier. The trade does not reflect a decision made on the transaction date.
Common code combinations
One Form 4 often carries several codes. These pairs appear often:
- M then S for the full amount. The insider exercises options and sells every share the same day. This is a cashless exercise. The insider keeps no stock.
- M then S for part of the amount. The insider exercises options and sells enough to cover the strike price and the tax. The rest stays in the shares owned column.
- A then F. The company grants shares, then withholds a portion for tax. This is the standard pattern when restricted stock units vest.
- P by several insiders in a short window. Separate people at the same company each file a purchase. Profitelligence groups these as a cluster.
How to read a filing in practice
Work through the form in this order:
- Read the relationship. Which boxes does the reporting person check?
- Read the code. A purchase (P) and a grant (A) are different events.
- Compute the value. Multiply the shares by the price per share.
- Compare to the holding. Divide the shares traded by the shares owned before the trade. A 25,000 share purchase means one thing at a 450,000 share position and another at a 30,000 share position.
- Read the footnotes. Look for the Rule 10b5-1 note and the indirect ownership note.
- Add the context. Check what else happened at the company. The 8-K filings for Apple and the financial statements sit next to the Form 4 history.
Late and amended filings
An insider who misses the two-day deadline files late. The SEC can bring an enforcement action, and the company must disclose delinquent filings in its proxy statement. EDGAR marks the late filing.
A Form 4/A amends an earlier Form 4. The "Explanation of Responses" section states what changed.
Where to find Form 4 filings
SEC EDGAR holds the official documents at https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany. Search the company, then filter for Form 4. EDGAR serves the raw HTML and XML.
Profitelligence parses the same filings and adds the price history around each trade. Each company has a filing history page, such as Apple or Nvidia, with a 90-day summary of what the insiders at that company did. The insider directory tracks one person across every company where that person files.
Next steps
Read Insider Transaction Types for the full code reference with worked examples.
Read SEC Filings Explained for the wider filing system.
Open the Insider Trading Dashboard to search parsed Form 4 data.