Section 16 explained
Who must report, on which form, by when, and how a matched pair of trades hands the company your profit.
Section 16 of the US Securities Exchange Act of 1934 does two jobs. It requires directors, officers and 10% owners to report their holdings and trades in a company's registered equity on a tight schedule, and it lets the company recover the profit from any matched purchase and sale within six months, with no need to show fault. This guide covers both briefly and points to the deep-dives where the detail lives.
Who is covered
Directors and 10% owners are easy to identify. Officers are not, because Section 16 defines an officer by function rather than title: the president, principal financial and accounting officers, any vice president in charge of a principal business unit or function, and anyone else performing significant policy-making functions. A vice president with real authority can be inside; the "president" of a minor subsidiary may not be. Treat the reporting population as a documented, effective-dated decision, not a reading of the org chart.
What gets reported is beneficial ownership, which reaches well beyond shares in the person's own name. It includes holdings of family members sharing the household, and of trusts, partnerships and controlled entities where the person has a financial interest, plus options, restricted stock units (RSUs) and other derivatives. Attribution is where opening positions most often go wrong, so the roster has to record the accounts and entities as well as the person.
Three forms, three clocks
Each form has its own trigger and deadline:
- Form 3 reports initial holdings, generally within 10 days of becoming a reporting person through appointment, election or crossing 10%.
- Form 4 reports changes before the end of the second business day after the transaction. That covers open-market trades, grants, option exercises, RSU vesting, sell-to-cover sales and, since the SEC's 2022 amendments, bona fide gifts. Trades under a Rule 10b5-1 plan must now be flagged as such.
- Form 5 is an annual sweep, due within 45 days of the fiscal year end, for anything exempt from earlier reporting or missed.
Most Form 4 traffic is equity compensation, so vesting and exercise data from your stock plan administrator has to reach you inside the window, carrying each event's exemption status with it. Most issuers file under a power of attorney so the deadline never waits on the individual, though the reporting person stays responsible for accuracy. Late filers are named in the company's proxy statement under Item 405 of Regulation S-K. The company also runs its own clock: Rule 16a-3(k) requires an issuer with a website to post each filing by the end of the next business day and keep it there for at least 12 months.
Six months, no excuses
Under Section 16(b), the company, or a shareholder suing on its behalf, can recover any profit from a purchase and sale (or sale and purchase) within six months. Intent and inside information are irrelevant. Courts match the lowest purchase price against the highest sale price in the window, so the recoverable "profit" can exceed anything the person made, and can arise even when they lost money overall. Check the prior six months before every trade, and record which compensation events are exempt under Rule 16b-3 rather than assuming it.
Ten per cent owners need extra care. The purchase that takes a holder over 10% is not itself matchable, but trades made while above the line are, including the sale that takes them back below it. Only once they are under 10% do later trades fall outside.
Filing access under EDGAR Next
Since 15 September 2025, filing runs through EDGAR Next, with Login.gov credentials, multi-factor authentication and managed filer permissions. A new reporting person without EDGAR codes needs a Form ID application, a notarised authenticating document and account set-up, none of which reliably fits inside a two-day window. Arrange it at appointment, not at the first trade. EDGAR Next, what changes for filers has the detail.
Start with the roster
Every recurring Section 16 failure, from an officer designated by title to a gift that missed the clock to a website posting that lapsed, is a record problem before it is a legal one. An effective-dated roster and an opening position reconciled to prior filings answer most coverage, timing and short-swing questions before they become arguments. Section 16 onboarding for new officers and directors sets out the full sequence.
InsiderList keeps that roster, builds opening positions from imported Forms 3, 4 and 5, tracks each open form's deadline alongside short-swing windows and posting dates, and hands filing-ready data to your filing provider before reconciling the accession number against what was sent. Your provider files; your counsel reviews.
See the Section 16 clock managed before it becomes the story. Book a demo with our team.
InsiderList is insider trading compliance software used by companies in the UK, Europe, the USA and the UAE. This article is for general information and does not constitute legal advice. For advice on your situation, consult qualified US securities counsel.
