What it means
When an officer, director or large owner buys or sells their company’s stock, they must report it on SEC Form 4 within roughly two business days. Unlike 13Fs, which surface positions up to 45 days after a quarter closes, Form 4s are near-real-time and carry the actual transaction date and price. THE ENTITY’s nightly sweep records these filings - open-market buys especially, since insiders sell for many reasons but tend to buy for one - and dates every event by its real transaction date. Clusters of separate insiders buying the same name inside a window are flagged as insider clusters, the strongest pattern in the tape.
Why it matters to investors
Form 4 buys are among the few public signals where the informed party is legally identified and the date is real. They are not infallible - insiders are early and sometimes wrong - but a cluster of genuine open-market buys is information with a timestamp you can verify.
Related terms
See Form 4 in the live AI chain.
THE ENTITY maps every constraint onto one live model - which part is tight now, who owns it, and who gets squeezed when it moves. Plain-English reads you can check.
THE ENTITY is an educational read on the AI supply chain - research, not investment advice. It explains how the chain works and who sits where, never price targets or buy/sell calls.