Corporate insider trading activity (SEC Form 4)

Officers, directors and shareholders owning more than 10% of a company must report changes in their holdings to the SEC within two business days, on Form 4. That is far more timely than Congressional disclosure and reports exact share counts and prices rather than ranges.

Most Form 4 filings are compensation mechanics rather than decisions: option grants, option exercises, and shares withheld to cover tax on a vesting event. Aggregating those into "insider selling" turns a payroll calendar into a headline. We keep the transaction code on every record and default to open-market purchases and sales.

• Filter by transaction code, so code P purchases can be separated from grants and tax withholding.
• Rule 10b5-1 plan status surfaced — a sale under a plan adopted months earlier says nothing about an insider's current view.
• Role of the filer, since a CFO buying carries different information from a newly seated director buying.