Read beyond the headline.
Understand what the filing says, what the derived metrics mean, and where the evidence stops.
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.
Read the guideWhat insider cluster buying can and cannot tell you
Understand buyer breadth, a transparent cluster score, and why multiple reporting names are not always multiple independent decisions.
Read the guideAn insider-buying research checklist
A repeatable process for moving from a Form 4 purchase to a source-checked company research question without mistaking a signal for an investment thesis.
Read the guideWhat does Form 4 code P mean? An open-market purchase, worked from a real filing
Code P marks an open-market or private purchase. Walk through a real Commerce.com (CMRC) Form 4 to see how the shares, price, and value line up.
Read the guideWhat does Form 4 code A mean? An award or grant, not a purchase
Code A reports a company-granted award, not cash spent on the open market. A real Commerce.com (CMRC) filing shows why the reported price is often zero.
Read the guideWhat does Form 4 code S mean? An open-market sale, worked from a real filing
Code S marks an open-market sale. See two real Commerce.com (CMRC) filings from the same officer, both flagged as 10b5-1 plan transactions.
Read the guide10b5-1 plan sales on Form 4: what the disclosure flag actually tells you
A disclosed 10b5-1 plan changes how a code S sale should be read. Compare a discretionary purchase against two real, plan-flagged sales from one company.
Read the guideNothing hidden in the score.
Review every component, its inputs, and its limitations.