Written from SEC primary filings, with every rule cited inline. Editorial standards.
SEC Form 4 is the U.S. Securities and Exchange Commission
filing that corporate insiders - directors, officers, and
beneficial owners of more than 10% of a company's stock - must submit to
report changes in their ownership of the company's securities. It is required
under Section 16(a) of the Securities Exchange Act of 1934,
with Form 4 generally due by the end of the second business day
following the transaction. The instructions specify reporting exceptions and
deemed-execution rules; not every employee or transaction has a Form 4 obligation.
A Form 4 is a public record of reported transactions and holdings, and it
covers more than cash purchases: grants, conversions, tax withholding and
gifts all appear on it. InsiderAlpha organizes these filings so you can follow
a transaction back to the original SEC document.
Directors and Section 16 officers
(a defined category that is not identical to the proxy statement's named executive officers) of public companies.
Beneficial owners of more than 10% of any class of a
company's registered equity - often hedge funds, private-equity firms,
and activist investors.
Indirect holdings can be reportable through an insider's
pecuniary interest in a trust, family holding or affiliated entity.
A family relationship alone does not make every relative a separate Form 4 filer.
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.
A Form 4 has two tables. Table I covers non-derivative
securities (ordinary common stock). Table II covers
derivative securities (options, warrants, convertible notes, RSUs). For each
transaction the form reports:
Transaction date - when the trade actually happened
(not when it was filed).
Transaction code - a one-letter code describing the
nature of the trade (see below).
Amount, price, and resulting shares owned - how many
shares changed hands, at what price, and the reported holding for the
relevant security and ownership form afterward.
Ownership type - "D" for direct ownership or "I" for
indirect (e.g. held through a trust or LLC).
Common transaction codes
P - Open-market or private purchase
S - Open-market or private sale
A - Grant or award (usually equity compensation)
M - Exercise or conversion of a derivative security
F - Shares withheld to pay taxes or an exercise price
G - Bona-fide gift
Under Instruction 8, a P can be a purchase of stock or of a derivative,
made on the open market or in a private deal. Read the security title, the
table and the footnotes before calling a row an exchange purchase of common
stock. A, M and F rows can raise or lower a holding without any purchase at
all. The full transaction-code guide
also separates the transaction code from the A/D flag beside the amount.
Direct vs. indirect, derivative vs. non-derivative
Indirect ownership means the interest is held through something else, such
as a trust, a spouse's account or an LLC, and the footnotes say what. Do not
ignore it. Do not assume the reporting person owns every share the entity
holds, either.
An option exercise usually shows up twice: a disposition of the derivative
in Table II and an acquisition of the underlying stock in Table I. That is one
event, not two purchases. A sale nearby needs its own read of price and
footnotes, because it was not necessarily all for taxes. The
derivative guide
works through a real award settlement and withholding example.
Why ownership reports are useful
With a Form 4 you can compare a change against the person's earlier
holdings and against what the company has disclosed. Academic studies such as
Lakonishok and Lee (2001)
and Cohen, Malloy and Pomorski (2012)
look at patterns across many transactions, and their definitions matter.
"Opportunistic" trading in the 2012 paper is not the same thing as an
unchecked plan box, and it is not another name for every
multi-insider cluster.
A filing is useful even though it forecasts nothing. It can show how an
award turned into common stock, whether a position actually changed, or which
other documents to read alongside it, and you can check each of those against
the source. The insider's private reasoning usually stays private.
How fast do Form 4 filings actually arrive?
The reporting clock. A Form 4 is public on EDGAR as soon as it is accepted, which is often well before the two-business-day deadline.
The deadline counts business days. If you measure in calendar days, say
so. A Friday trade makes Monday business day one and Tuesday business day two,
unless a holiday falls in between. The signature date is not the EDGAR
acceptance time; use the acceptance record to tell when a document became
public.
For filing-lag figures across the whole corpus, see the dated
Form 4 study and its methodology.
For a single transaction, keep its own trade and disclosure dates. If you
compare the insider's price with a later one, note when the later price was
taken and adjust for any split. A recent filing does not mean the insider's
price is still available, or that copying the trade has any expected
return.
Form 4 vs Form 3 and Form 5
Form 4 is one of three ownership reports required under Section 16(a):
Form
3 is the initial statement of ownership, filed within 10
days of a person becoming a director, officer, or 10% owner. It reports
holdings, not trades.
Form 4 reports changes in ownership within two business
days. This is the form where actual buys and sells appear.
Form
5 is an annual catch-up, due within 45 days of the
company's fiscal year end, covering transactions eligible for deferred
reporting and required transactions not previously reported. Bona fide
gift dispositions are now reportable on Form 4; do not rely on older
gift-reporting descriptions.
Affiliates meeting the applicable Rule 144 notice conditions also file
Form 144, which is a notice of an intended sale rather than a report of a
completed one. See Form 4 vs
Form 144 for the full comparison.
Amendments and duplicate filings
A Form 4/A can add or correct single rows instead of repeating the whole
filing. Read its explanation and keep the original accession, so the unchanged
transactions are not lost. And do not count a corrected row on top of the
original as if they were two separate trades.
Instruction 4 permits individual or joint reports by beneficial owners of
the same securities, so a fund and the person who controls it can both report
the same purchase. Compare the ownership footnotes before you count buyers.
InsiderAlpha groups duplicate filings and marks a primary record, but an
unusual ownership structure still needs a look at the source document.
Form 4 by the numbers
As of August 3, 2026, InsiderAlpha tracks 221,347
deduplicated Form 4 filings covering 6,114
companies and 53,567 distinct insiders.
The live count is higher and moves daily; the figures here are the frozen
snapshot used in our published
Form 4 study, with methodology and downloadable aggregate figures.
Those numbers count filings, not trades. One filing can contain several
transactions, and one purchase can appear in reports by several beneficial
owners. The total measures coverage. It is not a count of buy signals or a
performance result.
What a Form 4 does not tell you
A Form 4 reports what happened, not why. It does not disclose the
insider's reasoning, their view on valuation, or whether they hold offsetting
positions elsewhere. It will not tell you whether a purchase works out, what
the insider is worth, or whether the price was a good one. Read it next to
the company's financial statements and its other filings.
Frequently asked questions
Where can I find Form 4 filings for free?
Every Form 4 is public on
SEC EDGAR once
it is accepted, at no cost and with no account. EDGAR gives you the raw
filing: an XML document, with amendments sitting next to originals and no
screening or scoring. InsiderAlpha parses and deduplicates the same public
filings, and the daily trading plan ranks recent purchases by Alpha Score.
Do all insider trades appear on Form 4?
No. Section 16 status, the security and the transaction determine the
reporting obligation; exemptions and deferred reporting can apply. An employee
who is not a reporting officer can still have another reporting capacity,
such as director or greater-than-10% owner. Do not infer the absence of all
trading from the absence of a Form 4.
What happens if an insider files late?
Late Section 16 filings must be disclosed in the company's proxy
statement, and the SEC does enforce the deadline. In September 2014 it
charged
28 officers, directors and large shareholders, plus six companies, in a
single sweep aimed at repeat late filers found with ranking algorithms over
its own filing data. Some of those filings were late by years; 33 of the 34
settled, paying $2.6 million in penalties between them. It is also a
reminder to date a late filing and its trade separately.
Where does the 10b5-1 checkbox come from?
From
Release
33-11138, "Insider Trading Arrangements and Related Disclosures"
(December 2022), which added the checkbox, imposed cooling-off periods before
a new plan may trade, and required companies to file their insider trading
policies as an exhibit to the annual report. A checked box tells you the
filer says a plan was in place; it does not mean the SEC has accepted a
defense. An unchecked or missing box does not prove the insider picked the
date. The footnotes and the plan
guide help you read the rest.
What InsiderAlpha does with Form 4s
InsiderAlpha deduplicates Form 4 amendments, sorts every transaction by
its SEC code, flags Rule 10b5-1 plan
trades, and keeps purchases, sales and filing histories together for each
company. Treat any label we add as a pointer to the filing, not a replacement
for reading its security and ownership details.
Put the form beside a current disclosure
Pick one row in the recent
purchases feed, open its company page, and follow the original filing.
Read the transaction date first, then the price, the ownership column and the
footnotes. The weekly buys
page totals purchase value by company, which answers a different question
from the chronological feed. To hear about later filings, use
email or RSS.