Form 3 vs. Form 4 vs. Form 5: The Three SEC Insider Ownership Reports

Under Section 16 of the Securities Exchange Act, certain people with inside access to a public company must report their ownership of its stock to the SEC. That reporting happens on three forms: Form 3, Form 4, and Form 5. They serve different purposes, and Form 4 is the one most people mean when they talk about tracking insider trades.

Who Has to File

Section 16 applies to a company's:

• Directors.
• Officers (such as the CEO, CFO, and other executives who make policy).
• Beneficial owners of more than 10% of any class of the company's registered equity.

These people are called insiders for Section 16 purposes. Note that this is a specific legal category. It's different from the broader, fact-based idea of someone trading on inside information, which is covered in insider trading explained.

Form 3: The Starting Point

What it reports: an insider's initial holdings of the company's securities.

When it's due: within 10 days of becoming an insider (for example, upon being appointed an officer or director, or crossing 10% ownership). When a company goes public, insiders file Form 3 by the effective date of its registration.

Form 3 is a snapshot. It is filed even if the person owns no shares, so the SEC has a baseline.

Form 4: Changes in Ownership

What it reports: a change in holdings, including open-market purchases and sales, option exercises, and many grants and awards.

When it's due: within two business days of the transaction.

This is the form that powers insider-trading trackers, since it shows what insiders actually bought or sold, at what price, and how many shares they hold afterward. A transaction code identifies the type: for example, "P" for an open-market purchase and "S" for a sale. Compensation-related transactions such as grants and tax withholding are common and often say little about an insider's view. See SEC Form 4 explained and insider buying vs. insider selling.

Form 5: The Annual Catch-All

What it reports: certain transactions that were exempt from earlier reporting or not reported on Form 4 during the company's fiscal year, such as some small acquisitions and gifts.

When it's due: within 45 days after the end of the company's fiscal year.

Many insiders never need to file a Form 5, because their transactions were all reported on Form 4 already. Form 5 filings are therefore much less common, and also much less useful as a tracking signal.

Side by Side

	Form 3	Form 4	Form 5
Purpose	Initial holdings	Changes in holdings	Annual catch-up of exempt/unreported items
Deadline	10 days after becoming an insider	2 business days after the transaction	45 days after fiscal year-end
Frequency	Once per insider (per company)	As often as insiders transact	At most once per year, often not at all
Useful for tracking trades	Low	High	Low

How the Forms Fit Together

Think of a ledger: Form 3 sets the opening balance, Form 4 records each change as it happens, and Form 5 tidies up anything that slipped through at year-end.

All three are public on the SEC's EDGAR database.

Related Filings

These forms cover insiders. Other filings cover other kinds of holders:

• Form 144 is a notice of a planned sale of restricted or control stock.
• Schedules 13D and 13G report large holders of 5% or more; see 13D vs. 13G.
• Form 13F reports institutional holdings quarterly; see 13F filings.

Reading Them Carefully

• A Form 4 is a record, not a prediction. Insiders sell for many reasons. Open-market purchases are generally regarded as more informative than sales.
• Pre-scheduled trades under a 10b5-1 plan are set in advance.
• Context matters: several insiders buying at once, as in an insider cluster buy, is read differently from a single routine sale.

This article is for educational purposes only and is not investment or legal advice. Check current SEC rules for specifics.