Understanding Form 4 Transaction Codes: A Practical Guide

In the world of corporate disclosures, Form 4 plays a key role: this is the filing used by insiders—such as company officers, directors or 10 % shareholders—to report changes in their ownership of company securities. One of the most important pieces of information in that filing? The transaction codes. These little letters reveal what kind of transaction took place—and knowing how to interpret them gives you insight into insider behavior.

Here’s a quick breakdown of the major Form 4 transaction codes you’ll encounter:

·         P – Open-market or private purchase of a non-derivative or derivative security.

·         S – Open‐market or private sale of a non-derivative or derivative security.

·         V – Transaction voluntarily reported earlier than required.

·         A – Grant, award or other acquisition pursuant to Rule 16b‑3 (d).

·         D – Disposition back to the issuer under Rule 16b‐3(e).

·         F – Payment of exercise price or tax liability by delivering or withholding securities

·         M – Exercise or conversion of a derivative security exempted under Rule 16b‐3.

·         C, E, H, O, X – These apply for derivative securities: conversions (C), expirations (E/H), option exercises (O/X).

·         G – Bona fide gift of securities.

·         J – “Other” acquisition or disposition (must describe the transaction).

·         K – Transaction in an equity swap or similar instrument.

So why should you care? If you’re tracking insider activity—for investment research, compliance, or governance analysis—these codes are flags. A “P” signals that an insider is buying shares; an “S” that they’re selling. A “G” might indicate a gift. Derivative‐related codes (like “X” or “C”) hint at option activity rather than straight stock buys.

At Form345 we help you make sense of these codes, simplify your filing process and stay compliant. Understanding the why behind the code gives you an edge in interpreting the filings—and empowers you to act with clarity.