Fundamentals · Reading financial reports
Insider trading filings: Forms 3, 4 and 5 and how to read them
Who counts as a Section 16 insider, the Form 3, 4 and 5 deadlines, the transaction codes, Rule 10b5-1 plans, and how to tell a real insider buy from routine selling.
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When a company's chief executive buys or sells the company's stock, the public finds out within days. US law requires directors, officers and large shareholders to report their trades to the Securities and Exchange Commission (SEC) on a set of forms, mainly Form 4, and those reports are free to read on EDGAR the moment they are accepted.
These filings are popular with investors for an obvious reason: insiders know the business better than anyone outside it. But most insider transactions say little about what an insider thinks. Stock awards vest on a schedule, shares are withheld for taxes, and sales are often pre-planned months in advance. This guide explains who has to file, the deadlines, how to decode the transaction codes, what a Rule 10b5-1 plan is, and how to separate the rare informative trade from routine compensation mechanics, using a real Apple filing.
Who is an insider
Section 16 of the Securities Exchange Act of 1934 covers three groups at a company with a class of equity registered with the SEC:
- Directors, every member of the board.
- Officers, a defined group of senior executives: the president, principal financial and accounting officers, vice presidents in charge of major units, and others who make policy. A large company's executive team, not every employee called "vice president".
- Ten percent owners, anyone who beneficially owns more than 10% of a registered class of equity securities.
Section 16 also has a teeth-baring rule: under Section 16(b), the company can recover any profit an insider makes from a purchase and a sale (or sale and purchase) within six months of each other. It works regardless of intent, which is one reason insiders rarely flip shares quickly.
"Insider" in this sense is a reporting status. It is different from illegal insider trading, which means trading on material non-public information in breach of a duty, under Rule 10b-5. A Form 4 records a legal, disclosed trade.
The three forms and their deadlines
| Form | Purpose | Deadline |
|---|---|---|
| Form 3 | Initial statement of holdings | Within 10 days of becoming an insider |
| Form 4 | Each change in beneficial ownership | Before the end of the second business day after the trade |
| Form 5 | Annual statement of anything not yet reported | On or before the 45th day after the fiscal year ends |
The two-business-day Form 4 deadline dates from Section 403 of the Sarbanes-Oxley Act of 2002, effective August 29, 2002; before that, insiders could report as late as the tenth day of the month after the trade. For trades executed under a 10b5-1 plan, SEC Rule 16a-3(g) treats the trade date as the day the insider is told about it, within limits. Form 5 is now mostly a catch-up for small exempt items and for anything that should have been on a Form 4 but wasn't, which the form itself treats as delinquent. Since the 2022 amendments, bona fide gifts of stock must be reported on Form 4 like other transactions rather than waiting for Form 5.
Reading a Form 4: the transaction codes
A Form 4 has two tables. Table I lists non-derivative securities (common shares); Table II lists derivative securities (options, restricted stock units, warrants). Each row gives the date, a transaction code, the number of shares, whether they were acquired (A) or disposed of (D), the price, and the shares owned after the transaction. General Instruction 8 of the form lists the codes. The ones you will meet most:
| Code | Meaning (Form 4, Instruction 8) | Signal value |
|---|---|---|
| P | Open market or private purchase | High |
| S | Open market or private sale | Low to medium |
| A | Grant, award or other acquisition under Rule 16b-3(d) | None (pay) |
| M | Exercise or conversion of a derivative security exempted under Rule 16b-3 | Low |
| X | Exercise of an in-the-money or at-the-money derivative security | Low |
| F | Payment of exercise price or tax by delivering or withholding securities | None (tax) |
| G | Bona fide gift | None |
| D | Disposition to the issuer under Rule 16b-3(e) | Low |
| J | Other acquisition or disposition (described in a footnote) | Read footnote |
Footnotes matter as much as the table. They say whether a sale was under a 10b5-1 plan, whether shares are held in a trust, and how a reported price was averaged across many small trades.
Other Apple officers filed the same pattern that week: an M row for vesting, an F row for withholding, then S rows under 10b5-1 plans. When you see identical sequences across several executives on the same dates, you are looking at a vesting calendar, not a view on the stock.
Rule 10b5-1 plans
A Rule 10b5-1 plan is a written trading arrangement, adopted when the insider has no material non-public information, that sets the amounts, prices and dates of future trades (or a formula for them). Trades made under a qualifying plan get an affirmative defense against insider-trading claims, even if the insider later learns something material.
Because plans were sometimes adopted and then traded on almost at once, or quietly cancelled and replaced, the SEC tightened the rule. The amendments were adopted December 14, 2022 and took effect in February 2023:
- Cooling-off for directors and officers: no trading until the later of 90 days after adopting or modifying the plan, or two business days after the company discloses its results for the quarter in which the plan was adopted, capped at 120 days.
- Cooling-off for other persons (other than the issuer): 30 days.
- Certification: directors and officers must state in the plan that they are not aware of material non-public information and are acting in good faith.
- Limits on overlapping plans, and only one single-trade plan per 12 months for persons other than the issuer.
- Disclosure: for reports filed on or after April 1, 2023, Forms 4 and 5 carry a checkbox for trades intended to satisfy Rule 10b5-1(c), with the plan's adoption date. Companies also disclose officers' and directors' plan adoptions and terminations in their quarterly and annual reports.
For a reader, a 10b5-1 sale means "decided months ago". It is weaker evidence of a current view than a sale made outside a plan, although the decision to adopt a selling plan was itself made at some point.
How to read insider buying and selling
Buys are rarer and more telling than sales. Executives get most of their stock through pay, so they rarely need to buy it. An open-market purchase (code P) with personal cash is a deliberate choice. Sales, by contrast, have many routine reasons: taxes on vesting, diversification, a house, a divorce, estate planning.
Size relative to holdings. A director buying $50,000 of stock against a $5 million holding is a small gesture; a CFO doubling a stake is not. The "owned after" column lets you compute the change.
Cluster buys. When two or more insiders buy the same stock on the open market within a short window, the signal is harder to dismiss as one person's circumstances. Even then, treat it as a reason to look harder at the business, not as a forecast: a group of directors can share the same blind spot.
Price and context. A purchase after a steep fall, or soon after an earnings release (when trading windows typically open), is common. Many companies set blackout periods before results, so insider trades cluster in the weeks after a report.
Limits of the signal
- Most rows aren't trades of conviction. Codes A, M, F and G dominate many companies' filings.
- Plans blur intent. A 10b5-1 sale today reflects a decision from months ago.
- Insiders can be wrong. They know the company, not the market, and many well-timed purchases still lose money.
- Ten percent owners are different. A fund that owns 12% may trade for portfolio reasons that have nothing to do with inside knowledge.
- Late and amended filings exist. Check the filing date against the trade date, and look for Form 4/A amendments.
- Derivatives hide exposure. Hedges, collars and swaps (code K for equity swaps) can change an insider's economic stake without a simple buy or sell.
Insider filings and their neighbours
| Filing | Who files | When | Tells you |
|---|---|---|---|
| Form 3 | New directors, officers, 10% owners | Within 10 days | Starting holdings |
| Form 4 | Same insiders | Within 2 business days of a trade | Each trade |
| Form 5 | Same insiders | 45 days after fiscal year-end | Anything not yet reported |
| Schedule 13D / 13G | Owners of more than 5% of a class | 5 business days (13D) or by quarter (some 13G) | Large stakes and intent |
| Form 13F | Institutional managers with ≥ $100M | 45 days after quarter-end | Quarter-end long holdings |
| Form 8-K Item 5.02 | The company | Within 4 business days | Officer and director changes |
13F filings: what institutional holdings reports show and miss covers 13F and the 13D/13G distinction in more detail; Form 8-K: what triggers it, the item numbers and how to read one covers the company's own event reports.
How Finabase does it
The Insider trading page is a market-wide feed of SEC Form 4 transactions. It keeps only the codes an investor reads as a signal: open-market purchases (P), sales (S), and exercises and conversions (M and X). Awards, gifts, tax withholding and "other" codes are left out on purpose, so Mr. Cook's F row above would not appear, while his M and S rows would. Note that code M also covers restricted stock unit settlements, so the "Option exercises" filter includes vestings like his.
Filters cover type (Buys & sales, Buys, Sales, Option exercises, All), period (7, 14 or 30 days), a minimum value and a symbol; you can sort by newest or largest. Each row shows the date, symbol, insider and title, type, shares, price, value (shares × price), shares owned after, and a link to the filing on sec.gov. Tiles at the top total insider purchases and sales, a buy/sell ratio (dollars bought per dollar sold) and cluster buys: symbols that two or more different insiders bought in the window. On October 30, 2026, the 14-day view showed $140.56 million of open-market buys against $534.86 million of sales, a ratio of 140.56 ÷ 534.86 = 0.26, which is typical of how sales outweigh buys in dollar terms.
On a company page, the Holders tab has an Insiders table: insider, relation, latest transaction, date and shares held, linking through to the market-wide feed.
Frequently asked questions
How soon do insiders have to report a trade?
Before the end of the second business day after the trade, on Form 4. The filing is public on EDGAR as soon as the SEC accepts it.
Is insider selling a bad sign?
Not by itself. Most insider sales are tax withholding, sales of vested pay or pre-planned 10b5-1 trades. Large open-market sales outside a plan, or several insiders selling at once, deserve more attention than a routine sale after a vesting date.
What does transaction code F mean on a Form 4?
Code F means the insider paid an exercise price or a tax bill by delivering or having the company withhold shares. It is a tax and payroll mechanic, not a market sale.
What is a cluster buy?
A cluster buy is when two or more insiders of the same company buy shares on the open market within a short period. Because each bought with personal money, the group signal is harder to explain away than one insider's purchase.
What changed in the 2022 Rule 10b5-1 amendments?
They added cooling-off periods (90–120 days for directors and officers, 30 days for others), a good-faith certification, limits on overlapping and single-trade plans, Form 4 gift reporting, and a Form 4/5 checkbox marking trades made under a plan.
Summary
Directors, officers and 10% owners report their holdings on Form 3, every trade on Form 4 within two business days, and anything left over on Form 5. The transaction code tells you what really happened: P and S are market trades, while A, M and F are mostly pay and tax mechanics, as Apple's October 2025 vesting showed, where a $33 million "sale" was the after-tax remainder of a scheduled award, sold under a 10b5-1 plan. Since the 2022 amendments, those plans come with cooling-off periods and a Form 4 checkbox. Open-market buys, larger relative to holdings and by several insiders at once, carry the most information; even they are a clue to investigate, not a conclusion.
Sources and further reading
- SEC — Form 4, Statement of Changes in Beneficial Ownership, General Instructions (PDF)
- SEC — Form 3, Initial Statement of Beneficial Ownership (PDF)
- SEC — Form 5, Annual Statement of Changes in Beneficial Ownership (PDF)
- SEC — Fact sheet: Insider Trading Arrangements and Related Disclosure (Release 33-11138, December 2022)
- SEC — Press release 2022-222, SEC adopts amendments to modernize Rule 10b5-1 (December 14, 2022)
- SEC Release 34-46421 — Ownership Reports and Trading by Officers, Directors and Principal Security Holders (August 2002)
- SEC EDGAR — Form 4 filed by Timothy D. Cook for Apple Inc. (October 3, 2025)
- Apple Inc. — Form 10-K for the fiscal year ended September 27, 2025 (SEC EDGAR)