---
title: "What is SEC Form 4? Insider Trading Filings Explained"
description: "Who files SEC Form 4, the two-business-day deadline, transaction codes, ownership tables and amendments, with the SEC source for each rule."
canonical: https://insideralpha.ai/learn/sec-form-4
date_published: 2026-05-12
date_updated: 2026-09-23
publisher: InsiderAlpha (https://insideralpha.ai)
---

Canonical URL: https://insideralpha.ai/learn/sec-form-4
Published 2026-05-12. Updated 2026-09-23.

# What is SEC Form 4?

SEC **[Form 4](https://www.sec.gov/about/forms/form4.pdf)** is the U.S. Securities and Exchange Commission filing that corporate **insiders** - directors, officers, and beneficial owners of more than 10% of a company's stock - must submit to report changes in their ownership of the company's securities. It is required under **Section 16(a)** of the Securities Exchange Act of 1934, with Form 4 generally due by the end of the **second business day** following the transaction. The instructions specify reporting exceptions and deemed-execution rules; not every employee or transaction has a Form 4 obligation.

Two SEC rulemakings set that pace. The two-business-day deadline came from [Release 34-46421, "Ownership Reports and Trading by Officers, Directors and Principal Security Holders"](https://www.sec.gov/rule-release/34-46421) (August 2002), which replaced a monthly cycle under which a trade made on the 2nd of a month might not surface until the 10th of the next. Mandatory electronic filing and same-day EDGAR posting followed in [Release 33-8230, "Mandated Electronic Filing and Web Site Posting for Forms 3, 4 and 5"](https://www.sec.gov/rule-release/33-8230) (2003). Before those two changes, insider trading data was effectively a monthly paper archive. Afterwards it arrived electronically, within days of the trade.

A Form 4 is a public record of reported transactions and holdings, and it covers more than cash purchases: grants, conversions, tax withholding and gifts all appear on it. InsiderAlpha organizes these filings so you can follow a transaction back to the original SEC document.

This page covers the filing rules and the common codes. For the form itself, read the [box-by-box walkthrough with a real SEC filing](https://insideralpha.ai/learn/how-to-read-a-form-4). To practice on a current disclosure, pick one from [recent insider purchases](https://insideralpha.ai/insiders/recent-buys) and open the company's filing history.

## Who has to file Form 4?

- **Directors** and **Section 16 officers** (a defined category that is not identical to the proxy statement's named executive officers) of public companies.
- **Beneficial owners of more than 10%** of any class of a company's registered equity - often hedge funds, private-equity firms, and activist investors.
- **Indirect holdings** can be reportable through an insider's pecuniary interest in a trust, family holding or affiliated entity. A family relationship alone does not make every relative a separate Form 4 filer.

## How to read a Form 4

A Form 4 has two tables. **Table I** covers non-derivative securities (ordinary common stock). **Table II** covers derivative securities (options, warrants, convertible notes, RSUs). For each transaction the form reports:

- **Transaction date** - when the trade actually happened (not when it was filed).
- **Transaction code** - a one-letter code describing the nature of the trade (see below).
- **Amount, price, and resulting shares owned** - how many shares changed hands, at what price, and the reported holding for the relevant security and ownership form afterward.
- **Ownership type** - "D" for direct ownership or "I" for indirect (e.g. held through a trust or LLC).

## Common transaction codes

- **P** - Open-market or private *purchase*
- **S** - Open-market or private *sale*
- **A** - Grant or award (usually equity compensation)
- **M** - Exercise or conversion of a derivative security
- **F** - Shares withheld to pay taxes or an exercise price
- **G** - Bona-fide gift

Under Instruction 8, a P can be a purchase of stock or of a derivative, made on the open market or in a private deal. Read the security title, the table and the footnotes before calling a row an exchange purchase of common stock. A, M and F rows can raise or lower a holding without any purchase at all. The [full transaction-code guide](https://insideralpha.ai/learn/form-4-transaction-codes) also separates the transaction code from the A/D flag beside the amount.

## Direct vs. indirect, derivative vs. non-derivative

Indirect ownership means the interest is held through something else, such as a trust, a spouse's account or an LLC, and the footnotes say what. Do not ignore it. Do not assume the reporting person owns every share the entity holds, either.

An option exercise usually shows up twice: a disposition of the derivative in Table II and an acquisition of the underlying stock in Table I. That is one event, not two purchases. A sale nearby needs its own read of price and footnotes, because it was not necessarily all for taxes. The [derivative guide](https://insideralpha.ai/learn/open-market-vs-derivative-transactions) works through a real award settlement and withholding example.

## Why ownership reports are useful

With a Form 4 you can compare a change against the person's earlier holdings and against what the company has disclosed. Academic studies such as [Lakonishok and Lee (2001)](https://doi.org/10.1093/rfs/14.1.79) and [Cohen, Malloy and Pomorski (2012)](https://doi.org/10.1111/j.1540-6261.2012.01740.x) look at patterns across many transactions, and their definitions matter. "Opportunistic" trading in the 2012 paper is not the same thing as an unchecked plan box, and it is not another name for every [multi-insider cluster](https://insideralpha.ai/learn/cluster-buying).

A filing is useful even though it forecasts nothing. It can show how an award turned into common stock, whether a position actually changed, or which other documents to read alongside it, and you can check each of those against the source. The insider's private reasoning usually stays private.

## How fast do Form 4 filings actually arrive?

*Figure: The reporting clock. A Form 4 is public on EDGAR as soon as it is accepted, which is often well before the two-business-day deadline.*

The deadline counts business days. If you measure in calendar days, say so. A Friday trade makes Monday business day one and Tuesday business day two, unless a holiday falls in between. The signature date is not the EDGAR acceptance time; use the acceptance record to tell when a document became public.

For filing-lag figures across the whole corpus, see the dated [Form 4 study and its methodology](https://insideralpha.ai/learn/form-4-by-the-numbers). For a single transaction, keep its own trade and disclosure dates. If you compare the insider's price with a later one, note when the later price was taken and adjust for any split. A recent filing does not mean the insider's price is still available, or that copying the trade has any expected return.

## Form 4 vs Form 3 and Form 5

Form 4 is one of three ownership reports required under Section 16(a):

- **[Form 3](https://www.sec.gov/about/forms/form3.pdf)** is the initial statement of ownership, filed within 10 days of a person becoming a director, officer, or 10% owner. It reports holdings, not trades.
- **Form 4** reports changes in ownership within two business days. This is the form where actual buys and sells appear.
- **[Form 5](https://www.sec.gov/about/forms/form5.pdf)** is an annual catch-up, due within 45 days of the company's fiscal year end, covering transactions eligible for deferred reporting and required transactions not previously reported. Bona fide gift dispositions are now reportable on Form 4; do not rely on older gift-reporting descriptions.

Affiliates meeting the applicable Rule 144 notice conditions also file Form 144, which is a notice of an intended sale rather than a report of a completed one. See [Form 4 vs Form 144](https://insideralpha.ai/learn/form-4-vs-form-144) for the full comparison.

## Amendments and duplicate filings

A Form 4/A can add or correct single rows instead of repeating the whole filing. Read its explanation and keep the original accession, so the unchanged transactions are not lost. And do not count a corrected row on top of the original as if they were two separate trades.

Instruction 4 permits individual or joint reports by beneficial owners of the same securities, so a fund and the person who controls it can both report the same purchase. Compare the ownership footnotes before you count buyers. InsiderAlpha groups duplicate filings and marks a primary record, but an unusual ownership structure still needs a look at the source document.

## Form 4 by the numbers

As of August 3, 2026, InsiderAlpha tracks **221,347 deduplicated Form 4 filings** covering **6,114 companies** and **53,567 distinct insiders**. The live count is higher and moves daily; the figures here are the frozen snapshot used in our [published Form 4 study, with methodology and downloadable aggregate figures](https://insideralpha.ai/learn/form-4-by-the-numbers).

Those numbers count filings, not trades. One filing can contain several transactions, and one purchase can appear in reports by several beneficial owners. The total measures coverage. It is not a count of buy signals or a performance result.

## What a Form 4 does not tell you

A Form 4 reports what happened, not why. It does not disclose the insider's reasoning, their view on valuation, or whether they hold offsetting positions elsewhere. It will not tell you whether a purchase works out, what the insider is worth, or whether the price was a good one. Read it next to the company's financial statements and its other filings.

## Frequently asked questions

### Where can I find Form 4 filings for free?

Every Form 4 is public on [SEC EDGAR](https://www.sec.gov/search-filings) once it is accepted, at no cost and with no account. EDGAR gives you the raw filing: an XML document, with amendments sitting next to originals and no screening or scoring. InsiderAlpha parses and deduplicates the same public filings, and the daily trading plan ranks recent purchases by Alpha Score.

### Do all insider trades appear on Form 4?

No. Section 16 status, the security and the transaction determine the reporting obligation; exemptions and deferred reporting can apply. An employee who is not a reporting officer can still have another reporting capacity, such as director or greater-than-10% owner. Do not infer the absence of all trading from the absence of a Form 4.

### What happens if an insider files late?

Late Section 16 filings must be disclosed in the company's proxy statement, and the SEC does enforce the deadline. In September 2014 it [charged 28 officers, directors and large shareholders, plus six companies](https://www.sec.gov/newsroom/press-releases/2014-190), in a single sweep aimed at repeat late filers found with ranking algorithms over its own filing data. Some of those filings were late by years; 33 of the 34 settled, paying $2.6 million in penalties between them. It is also a reminder to date a late filing and its trade separately.

### Where does the 10b5-1 checkbox come from?

From [Release 33-11138, "Insider Trading Arrangements and Related Disclosures"](https://www.sec.gov/files/rules/final/2022/33-11138.pdf) (December 2022), which added the checkbox, imposed cooling-off periods before a new plan may trade, and required companies to file their insider trading policies as an exhibit to the annual report. A checked box tells you the filer says a plan was in place; it does not mean the SEC has accepted a defense. An unchecked or missing box does not prove the insider picked the date. The footnotes and the [plan guide](https://insideralpha.ai/learn/rule-10b5-1) help you read the rest.

## What InsiderAlpha does with Form 4s

InsiderAlpha deduplicates Form 4 amendments, sorts every transaction by its SEC code, flags [Rule 10b5-1 plan](https://insideralpha.ai/learn/rule-10b5-1) trades, and keeps purchases, sales and filing histories together for each company. Treat any label we add as a pointer to the filing, not a replacement for reading its security and ownership details.

## Put the form beside a current disclosure

Pick one row in the [recent purchases feed](https://insideralpha.ai/insiders/recent-buys), open its company page, and follow the original filing. Read the transaction date first, then the price, the ownership column and the footnotes. The [weekly buys page](https://insideralpha.ai/top-insider-buys-this-week) totals purchase value by company, which answers a different question from the chronological feed. To hear about later filings, use [email or RSS](https://insideralpha.ai/alerts).

[Browse the latest Form 4 filings →](https://insideralpha.ai/filings) · [Read a Form 4 box by box →](https://insideralpha.ai/learn/how-to-read-a-form-4) · [How to read insider buying signals →](https://insideralpha.ai/learn/insider-buying-signals)

*This article is informational and is not investment advice.*