Form 3 vs Form 4 vs Form 5
By InsiderAlpha · Published
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 they answer different questions.
Form 3 - "I am now an insider"
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 - no transactions, just the starting position. A wave of Form 3s is often the first public record of a new executive team or an activist crossing the 10% threshold.
Form 4 - "I just traded"
The workhorse. Any change in beneficial ownership - a purchase, sale, grant, option exercise, or gift - must be reported within two business days (see the filing deadline explained). Because the lag is so short, Form 4 is the only Section 16 filing fast enough to trade on, and it is the backbone of every insider-signal dataset, including InsiderAlpha's live feed.
Form 5 - the annual catch-up
Due within 45 days of fiscal year end, Form 5 sweeps up the small set of transactions that were allowed to be deferred (certain exempt or de-minimis acquisitions) and anything that should have been on a Form 4 but wasn't. A Form 5 that discloses previously unreported transactions is a small red flag in itself - it means the two-day rule 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 |
| Signal value | Context | High | Housekeeping (late items are a small red flag) |
Where Form 144 fits
Form 144 is not a Section 16 filing at all - it is a notice of intent to sell restricted stock under Rule 144, filed by affiliates before the sale. It often front-runs the matching Form 4 by days, which is why InsiderAlpha ingests both (see Form 4 vs Form 144).
This article is informational and is not investment advice.