Insider buying means share purchases made by people close to a company — its executives, directors or large shareholders buying stock in the business they help run. The wider term insider trading also covers individuals or firms dealing in shares on the back of information that is not publicly available.
The law sets firm rules for insiders designed to stop confidential information being turned into a private profit. Breaking them can mean handing back the gains, a fine or a prison sentence. Insiders are still free to trade their own company’s shares, and they do so routinely — in the United States they simply have to tell the Securities and Exchange Commission (SEC) about it.
Who counts as an insider
An insider is usually a member of a company’s leadership — a chief executive, a finance director, a board member or another senior employee — who has access to confidential information about the business that has not been made public.
The definition also stretches to anyone who has received non-public information from someone inside the firm, an ordinary employee included. Banks, law firms and government bodies with access to confidential material can fall into the same bracket.
For US reporting duties, though, the relevant circle is narrower. Filings under §16 of the Securities Exchange Act come from directors, officers and holders of more than ten per cent of a registered class of shares. Beneficial ownership notices sit apart from those: they apply to anyone above five per cent, whether or not they work at the company.
How insider trades are reported
In the United States, insider dealings are regulated and monitored by the Securities and Exchange Commission (SEC). To keep the market transparent and to make misuse of confidential information harder, insiders have to report their transactions to the SEC on a set of standard forms.
The one most people watch is Form 4. It has to be filed by the end of the second business day after the day the transaction took place. The clock runs from the trade date rather than settlement, and the deadline has not changed since 2003. The form carries the number of shares, the price, the date and the nature of the transaction.
Filings become public the moment they land in the SEC’s system. The cut-off for a filing to be accepted with the same day’s date moved in 2024 from 5.30pm to 10pm Eastern time.
Which forms insiders file
| Form | Who files it | Deadline | What it reports |
|---|---|---|---|
| Form 3 | A director, an officer or a holder of more than 10% of shares registered under §12; now also directors and officers of foreign private issuers (FPIs) | Within 10 days of becoming such a person; on a first registration (IPO), no later than the effective date of the registration statement | Opening position in all of the issuer’s shares and derivatives on the day insider status begins (filed even when the holding is nil) |
| Form 4 | The same §16 insiders | By the end of the second business day after the day the transaction took place (counted from the trade date, not settlement) | Every change in holdings — purchases, sales, option exercises, conversions of derivatives and gifts (bona fide gifts) |
| Form 5 | The same insiders, where transactions went unreported | Within 45 days of the end of the issuer’s financial year | Small transactions and those exempt under §16(b) that went unreported during the year, plus late items |
| Schedule 13D | An investor holding more than 5% of a class of shares with control intent (seeking to influence management or control) | 5 business days from crossing 5%; amendments within 2 business days of a material change | Identity of the acquirer, source of funds, size of the stake and intent towards the company |
| Schedule 13G | An investor above 5% without control intent — qualified institutional investors (QIIs), passive and exempt investors | QII/exempt: 45 days after the end of the calendar quarter; passive investor: 5 business days; QII above 10%: 5 business days after month end; amendments 45 days after quarter end (passive investors 2 business days) | Short-form notice of a passive holding above 5% — who, how much and what type of investor |
Two lines in that table deserve a second look. Gifts of shares have been reportable on Form 4 within two business days for filings made on or after 1 April 2023; before that they could be deferred to the annual Form 5. And both Form 4 and Form 5 carry a tick box for transactions carried out under a pre-arranged trading plan under Rule 10b5-1, so the filing itself tells you whether the trade was scheduled in advance.
Beneficial ownership notices have had to be filed in a machine-readable, structured format since 18 December 2024, which makes them far easier to process in bulk.
What changed in the deadlines after 2023
If you have read somewhere that a Schedule 13D is due within ten days, that is out of date. The SEC adopted its Modernization of Beneficial Ownership Reporting rule (Release 33-11253 / 34-98704) on 10 October 2023; it was published in the Federal Register on 7 November 2023 and took effect on 5 February 2024.
Since then an initial Schedule 13D has been due within five business days of crossing the five per cent threshold, rather than the original ten calendar days. Amendments to a 13D now have a hard deadline of two business days from a material change, where the old rule said only “promptly”. On publishing the rule, the then SEC chair Gary Gensler summed it up by saying the public should not be learning about an attempt to influence control of a company ten days after the fact.
Schedule 13G had its whole calendar rewritten, with compliance mandatory from 30 September 2024. Qualified institutions and exempt investors file an initial notice within 45 days of the end of the calendar quarter, instead of the previous 45 days after year end. A qualified institution crossing ten per cent has five business days after month end rather than ten days. Passive investors file within five business days instead of ten. Amendments moved to 45 days after quarter end for all filer types, and for passive investors from “promptly” to two business days.
The difference between a 13D and a 13G is more than paperwork. In interpretive guidance 103.11, issued on 11 February 2025, the SEC clarified that what matters is the intent to change or influence control of the issuer. The mere fact that a shareholder cannot rely on the antitrust exemption under the HSR Act because it is trying to influence management does not, on its own, disqualify it from filing a 13G.
Insiders at foreign issuers from March 2026
An entirely new group of filers has been added. The Holding Foreign Insiders Accountable Act was signed on 18 December 2025, the SEC adopted implementing rules on 27 February 2026 (Release 34-104903) and they took effect on 18 March 2026.
Directors and officers of foreign private issuers with shares registered under §12 now file Forms 3, 4 and 5. They had previously been exempt from §16 across the board, and the current version of Form 3 has been amended to mention directors and officers of a foreign private issuer. Holders above ten per cent are not caught at these issuers — the duty falls on directors and officers only.
For readers in the UK and Europe there is an important carve-out. The SEC has issued exemptive orders for jurisdictions with comparable domestic reporting regimes: on 5 March 2026 (Release 34-104931) for Canada, Chile, the European Economic Area, South Korea, Switzerland and the United Kingdom, and on 20 May 2026 (Release 34-105517) for Australia, India and Singapore. Insiders at EEA and UK issuers are therefore exempt in practice, and their dealings have to be looked up in the domestic disclosure regime rather than in EDGAR.
Anyone in post on 18 December 2025 had their first Form 3 due on 18 March 2026. Anyone appointed between 18 December 2025 and 18 March 2026 filed by the later of 18 March 2026 or ten days from taking up the role.
Where to look for insider dealings
Insider purchases are not hidden away and you do not need a paid tool to see them. The press tends to pick up only the transactions running into hundreds of millions, so the vast majority of filings pass without comment. What the sources differ on is how much you can get out of them.
Most readers here will be looking at US-listed companies, where EDGAR is the reference point. On the London market the equivalent duty sits in Article 19 of the UK Market Abuse Regulation, under which persons discharging managerial responsibilities notify the issuer and the FCA within three business days, and the resulting announcements are published through RNS and archived in the FCA’s National Storage Mechanism.
SEC EDGAR
EDGAR on sec.gov is the primary source. It holds the original Form 3, 4 and 5 filings for a given company and for a given person — share counts, price, transaction date, transaction code, footnotes and the 10b5-1 tick box. It is free, and it is the document the insider actually signed.
What you will not get from it is any comparison across the market. EDGAR will not rank transactions by size, will not flag that five people at the same company bought on the same day, and will not explain why the trade happened. You always work from one company or one name at a time.
EDGAR full-text search
The SEC’s full-text search looks inside the body of filings. It is useful when you know the name of an insider or a company and want to see everywhere it appears, or when you are hunting for a particular phrase in the footnotes.
What you will not get is a filter by size or transaction type. It is a text search rather than a market screener, so it has no answer to the question of where insiders are buying most right now.
Aggregators
If you want to follow a particular stock, you can pull up a summary of insider transactions on Finviz. Aggregators take the data from SEC filings and serve it as a rolling list with filters, which is the only sensible way to scan the market as a whole.
What you will not get is the footnotes and the context of the filing. Transcription errors creep in, and a list entry does not always make clear whether the trade was a purchase with the person’s own money, an option exercise or a gift. Anything you intend to build on is worth checking against the original in EDGAR. Finding companies with heavy insider buying can be harder work than it sounds, and systematic screening is often behind a paywall.
Telling a meaningful purchase from a routine one
Most of the entries in a list of insider transactions did not begin with a decision to buy anything. Several things in the filing itself help you tell them apart.
The first is how the shares were acquired. An open-market purchase with the person’s own money is a different animal from an option exercise, a share award or an automatic acquisition through an employee plan. Form 4 has a column for the transaction code, so you can see which of those it was without guessing. A manager handed a block of shares for hitting a target has expressed no view whatsoever on the price.
The second is size relative to that person’s own circumstances. A purchase worth a fraction of an annual salary can look impressive in absolute terms for a well-paid chief executive and still mean nothing to them. Measuring the amount against their existing holding and their pay tells you more than measuring it against the company’s market capitalisation.
The third is the number of people involved. Purchases by several insiders in different roles over a short period carry different information from a single lone order, because coincidental personal reasons stack up less neatly across several people. Even then it is an observation, not evidence about where the price goes next.
The fourth is the dates. A filing shows both the transaction date and the filing date, and up to two business days can sit between them. The price may well have moved in the meantime, so the insider bought at a level other than the one on your screen when you read about the trade.
Why an insider sale need not mean anything
With sales it is impossible to pin down the reason with any certainty, and in the overwhelming majority of cases it has nothing to do with a view on the company.
The commonest explanations are mundane. A manager is paying the tax on shares that have just vested under a pay scheme. They are spreading their risk, because a single stock currently represents both their job and most of their wealth. They are buying a house, settling a divorce or meeting an obligation to a bank.
On top of that sit the pre-arranged trading plans under Rule 10b5-1. The insider sets out in advance how many shares are sold and when, and the plan then runs without further involvement on their part. That is precisely why Forms 4 and 5 carry a tick box for transactions made under such a plan, so you can check whether a given sale was scheduled.
Gifts are a category of their own. Since April 2023 they have been reported on Form 4 as quickly as an ordinary trade, so they show up among the other transactions and can look at first glance like a decision to sell out.
Purchases by activist investors
Activist investors buy sizeable stakes in companies with the aim of steering their strategy and decisions. If an investor in the US crosses five per cent of a class of shares and intends to influence management or control of the business, a Schedule 13D is due within five business days.
The form gives the identity of the acquirer, the size of the stake, the source of the funds and the intent towards the company, which might be a demand for management changes or a push for a merger or a sale. Amendments follow within two business days of a material change, so a campaign can be followed almost as it unfolds.
An investor with no control intent files the shorter Schedule 13G. A switch from a 13G to a 13D is worth noticing in itself, because it means the nature of the holding has changed from passive to active.
What insider data cannot tell you
Insider dealings should never be the sole reason to buy or sell a share. An insider purchase is not an investment signal. It is information about what one particular person did with their own money, and it says nothing about where the share price is heading.
The forms also do not say why the transaction happened. The SEC requires the act to be reported, not the reasoning behind it, so every interpretation of motive is the reader’s own guesswork. Insiders get things wrong, they have personal reasons you will never hear about, and they buy or sell in the windows when they are permitted to trade at all.
So if you do follow insider transactions, treat them as one input among many and do not skip the work of understanding the business. EDGAR tells you what happened; the rest is on you.