How to read SEC Form 4 transaction codes
A practical guide to telling a purchase from an award, exercise, gift, or tax-related transaction, with a source-first reading workflow.
Start with the transaction, not the headline
An increase in reported ownership is not automatically an insider buying stock with new capital. Form 4 covers several kinds of ownership changes. The code and acquired-or-disposed direction tell you what kind of event you are looking at before you interpret its dollar value.
For purchase research, begin with P and an acquired direction. P includes purchases on an exchange as well as private purchases. It does not, by itself, tell you whether the transaction was an independent personal investment, a negotiated financing, or an investment through a related entity. InsiderFilingDesk calls these purchases rather than promising every P line is an open-market trade.
The codes that most often change the story
S identifies a sale. A identifies an award, grant, or other company-related acquisition. M identifies an exercise or conversion of a company-issued derivative. F concerns payment of an exercise price or tax liability using securities. G identifies a gift. These events can change ownership without representing the same economic decision as a P purchase.
An executive who receives an award and withholds shares for taxes can generate both acquisition and disposition lines. Adding up every acquired line as buying, or every disposed line as selling, would obscure that sequence. Keep the lines visible, but classify them separately. The screener's Compensation tab groups A, M, and F; the All transactions view preserves other loaded codes.
Read both dates and the ownership column
The transaction date answers when the event happened. The filing date answers when it was reported. A list sorted by new filings can therefore contain trades from earlier periods. InsiderFilingDesk's main screener uses filing dates for its window filter, while company activity charts and cluster scores use transaction dates.
Direct and indirect ownership are different reporting contexts. A trust, partnership, or fund may sit between the reporting person and the security. Open the filing footnotes to understand the relationship, any beneficial-ownership disclaimer, the security class, and whether a quoted price is an average across several trades.
A simple way to avoid a misleading total
Consider an illustrative filing with a 20,000-share award, 7,000 shares withheld, and a separate 5,000-share P purchase at $10. The purchase screen should show the $50,000 purchase, not claim that all 25,000 acquired shares were bought. The award and withholding still belong in the complete history.
Before using any screen result, verify its original source, inspect amendments and footnotes, and check the freshness of the market snapshot used for comparisons. A correctly classified trade is a better research input. It is not a valuation conclusion.
Primary sources
Use these original SEC resources to check the filing definitions and reporting context discussed above.
This guide explains a research process, not a recommendation to buy or sell securities. InsiderFilingDesk is not affiliated with the SEC.