What is an SEC Form 4 (insider trading)?
An SEC Form 4 is the filing a company insider submits to report a change in their ownership of the company's stock, such as a purchase or a sale.
Who files a Form 4
Officers, directors, and shareholders who own more than 10% of a company must report their trades in that company's securities under Section 16 of the Securities Exchange Act.
Why it matters
Insider buying and selling can hint at how the people closest to a company view its prospects. Clustered or unusually large insider purchases tend to get watched closely.
How QuantConomy surfaces it
QuantConomy reads Form 4 filings, links each one to the issuer and the insider, and can raise an INSIDER_TRADE signal with a direction and strength, so you do not have to read the raw document.
Questions
How soon must a Form 4 be filed?
Insiders generally must file a Form 4 within two business days of the transaction. Filing rules are set by the SEC.
What is the difference between Form 3, Form 4, and Form 5?
Form 3 is the initial statement of ownership, Form 4 reports changes such as buys and sells, and Form 5 is an annual catch-up for transactions that were exempt or missed.
See it in the product
QuantConomy turns this into ranked, source-linked signals for your dashboard and your AI agents. Early access is opening in stages.
Last updated June 3, 2026