What Is SEC Form 4? Complete Filing Guide

SEC Form 4, officially titled the Statement of Changes in Beneficial Ownership, is one of the most important documents in the world of insider trading research. Every time a corporate insider buys, sells, or otherwise changes their ownership stake in a public company, they are required to disclose it through this filing. For investors who follow insider activity, Form 4 is the primary source of actionable data.

Unlike quarterly earnings reports or annual filings that arrive on a scheduled basis, Form 4 filings are triggered by specific events — namely, transactions involving company securities by people who have access to non-public information. This makes them uniquely valuable as real-time signals of insider sentiment.

Who Must File SEC Form 4?

Form 4 must be filed by anyone classified as a reporting person under Section 16 of the Securities Exchange Act of 1934. This includes three categories of individuals:

• Officers — CEOs, CFOs, COOs, and other executive officers with significant decision-making authority within the company.
• Directors — Members of the company's board of directors, including independent and non-executive directors.
• Beneficial owners of more than 10% — Any individual or entity that holds more than 10% of a class of the company's equity securities.

These individuals are collectively known as corporate insiders. Their transactions are closely watched because they have intimate knowledge of the company's operations, financial health, and future prospects.

When Must Form 4 Be Filed?

Under current SEC rules, Form 4 must be filed within two business days of the transaction date. This tight deadline was established by the Sarbanes-Oxley Act of 2002, which shortened the previous deadline from ten days after the close of the calendar month in which the transaction occurred.

The two-day requirement means that insider transactions become public almost immediately. When a CEO purchases $500,000 worth of shares on Monday, the filing typically appears on EDGAR by Wednesday. This near-real-time disclosure is what makes Form 4 data so valuable for investors tracking insider buying and insider selling activity.

What Information Does Form 4 Contain?

Each Form 4 filing provides a detailed snapshot of the transaction and the reporting person's holdings. The key data points include:

• Issuer information — The company whose securities were traded, including its name, ticker symbol, and CIK number.
• Reporting person — The insider's name, their relationship to the company (officer, director, or 10% owner), and their title if applicable.
• Transaction date — The exact date the trade was executed.
• Transaction code — A single letter indicating the type of transaction, such as P for open market purchase or S for open market sale.
• Number of shares — How many shares were involved in the transaction.
• Price per share — The price at which the transaction was executed.
• Shares owned after transaction — The insider's total holdings following the trade, providing context for the size of the transaction relative to their position.

Table I vs. Table II

Form 4 is divided into two main tables that separate different types of securities. Understanding the distinction is important for accurately interpreting the filing.

Table I covers non-derivative securities — primarily common stock. When an insider buys or sells shares on the open market, those transactions appear here. For most investors focused on insider sentiment, Table I contains the most relevant information.

Table II covers derivative securities such as stock options, warrants, and convertible notes. When an insider exercises stock options or converts another instrument into common shares, the derivative side of the transaction appears in Table II while the resulting shares may also appear in Table I. For a deeper understanding of how to interpret both tables, see our guide on how to read SEC Form 4.

Where to Find Form 4 Filings

All Form 4 filings are publicly available through the SEC's EDGAR (Electronic Data Gathering, Analysis, and Retrieval) system. EDGAR is the official repository for all SEC filings and can be accessed at sec.gov. You can search for filings by company name, ticker symbol, CIK number, or individual insider name.

While EDGAR provides comprehensive access, navigating the raw filings can be cumbersome. The XML format is not designed for quick analysis, and comparing transactions across multiple insiders or companies requires significant manual effort. For more on using EDGAR effectively, see our guide on using SEC EDGAR for insider trading research.

How InsiderFlow Makes Form 4 Data Accessible

InsiderFlow processes every Form 4 filing as it appears on EDGAR and transforms the raw data into a searchable, filterable format. Instead of reading through XML documents, you can browse insider transactions in a clean table view, filter by transaction type, and quickly identify patterns like cluster buys where multiple insiders purchase shares within a short window.

You can view the most recent Form 4 filings on the latest filings page, track specific companies on their stock pages, or focus on the transactions that matter most using our insider buying and CEO purchases filters. Each filing links back to the original SEC document, so you can always verify the source data.

Understanding Form 4 is the foundation of insider trading analysis. Once you know what the filing contains and where to find it, the next step is learning how to read a Form 4 line by line and understanding the transaction codes that distinguish different types of insider activity.