Scope of insider activity
Insider filings show when officers, directors, and major holders buy, sell, or change their holdings. They reduce information gaps but a single transaction is not a prediction of the future share price. Compensation, tax, and personal diversification can all affect the decision.
Read the filing
For U.S.-listed companies, SEC EDGAR Forms 3, 4, and 5 can show date, amount, price, transaction code, and ownership form. Read the primary filing before a headline and separate an open-market purchase or sale from an option exercise or grant. Direct and indirect ownership also matter.
Context for buys and sales
A purchase can suggest a view about value, but one person's trade cannot establish the outlook for the whole company. Sales have many causes, including taxes, stock compensation, and reducing a concentrated position. Repeated activity by several insiders and the change in ownership deserve more context than a one-off event.
Planned trading
Trades under a pre-arranged 10b5-1 plan differ from a decision made at the transaction date. Review adoption date, amendments, and pattern where disclosed. A plan does not make a transaction meaningless, but it narrows the interpretation that can fairly be drawn.
Limits of one transaction
After an option exercise and sale, check whether net holdings rose or fell and whether shares were sold for withholding tax. Total ownership before and after the trade and the compensation calendar may say more than the headline dollar amount.
A review order
Review the original filing, transaction code, post-transaction holdings, trading plan, earnings release, and risk factors in that order. Insider activity is supporting evidence to read alongside other disclosures, not an independent trading signal.