Form 3 vs Form 4 vs Form 5
By InsiderAlpha · Published · Updated
Written from SEC primary filings, with every rule cited inline. Editorial standards.
Section 16 of the Securities Exchange Act requires corporate insiders - directors, officers, and beneficial owners of more than 10% - to disclose their holdings and every change to them. Three forms carry that disclosure, and each answers a different question.
Form 3 records the starting position
Filed within 10 days of becoming a director, officer, or 10% owner (or by the effective date of an IPO registration). Form 3 is a snapshot of initial beneficial ownership: holdings, no transactions. A batch of Form 3s is often the first public record of a new executive team, or of an activist crossing 10%.
Follow insider buying without reading every filing
We read every Form 4 as it is filed and rank the insider purchases worth a look into a daily trading plan, so you do not have to open each filing yourself.
Free by email: highlights from the previous session's daily trading plan each market morning, plus a Friday roundup of the week's insider buying.
Basic reads each plan from the previous close, before the open. Compare plans or see the daily plan.
Form 4 records each trade
Most changes in beneficial ownership - a purchase, sale, grant, option exercise, or gift - must be reported within two business days (see the filing deadline explained). That short lag makes Form 4 the only Section 16 filing that arrives within days of a trade. It is what most insider-trading data is built on, including InsiderAlpha's Form 4 feed.
Form 5 is the annual catch-up
Due within 45 days of fiscal year end, Form 5 picks up the small set of transactions that could be deferred (certain exempt or small acquisitions) and anything that should have been on a Form 4 but was not. If a Form 5 reports a transaction that belonged on a Form 4, that two-day deadline was missed.
Side-by-side
| Form 3 | Form 4 | Form 5 | |
|---|---|---|---|
| Trigger | Becoming an insider | Any transaction | Fiscal year end |
| Deadline | 10 days | 2 business days | 45 days after year end |
| What it reports | Starting holdings, no trades | Each buy, sell, grant, exercise, or gift | Deferred and missed transactions |
| Useful for | The starting position | Individual trades, within days | Deferred items and late reports |
Where Form 144 fits
Form 144 is not a Section 16 filing. It is a notice of a proposed sale under Rule 144, filed by affiliates. The notice can go in at the same time as the sell order, so it is no guaranteed advance warning, but it often appears before the matching Form 4. InsiderAlpha stores both (see Form 4 vs Form 144).
This article is informational and is not investment advice.