What is insider trading?
The phrase covers two very different things, and the difference is the whole subject. Legal insider trading is corporate insiders buying and selling their own company’s stock and reporting it publicly — millions of transactions a year, disclosed on Form 4 within two business days, and the entire dataset this site is built on. Illegal insider trading is anyone — insider or not — trading on material non-public information in breach of a duty of trust. One is a disclosure regime working as designed; the other is securities fraud.
The legal kind: Section 16
Directors, officers and 10% owners may trade their company’s stock, subject to company trading windows and two federal guardrails:
- Disclosure — Section 16(a). Every transaction is reported on Forms 3, 4 and 5 and becomes a public EDGAR filing, which is why you can browse every insider purchase here for free.
- The short-swing rule — Section 16(b). Any profit an insider makes from a purchase and sale (or sale and purchase) within six months is recoverable by the company, mechanically and regardless of intent. It exists to make quick round-trips pointless for insiders.
Insiders wanting to trade regularly despite always knowing something use Rule 10b5-1 plans — pre-committed schedules adopted when they held no material non-public information.
The illegal kind: Rule 10b-5
The fraud version needs three ingredients: information that is material (a reasonable investor would care — earnings, a merger, a failed trial), non-public, and a trade made in breach of a duty — either the classical insider’s duty to shareholders or, under the misappropriation theory, a duty owed to whoever the information was taken from. Tippers who pass information for a benefit and tippees who trade on it knowing its origin are both reachable. Consequences run from disgorgement and civil penalties of up to three times the profit to criminal prosecution carrying up to 20 years.
Note what the illegal kind does not require: being an executive. Cases have involved printers, lawyers, IT staff, and family members — the duty, not the job title, is what matters.
Why the legal kind is worth reading
Because it is the one place executives put their own money where their information is, in public, on a two-day delay. The filings can’t tell you what an insider knows — that would be the illegal kind — but decades of academic research finds that open-market purchases, especially by several insiders at once, have historically carried information. That pattern, not any single trade, is what the cluster-buy page surfaces.
Common questions
Is insider trading always illegal?
No. Corporate insiders may legally trade their own company’s stock if they trade without material non-public information and report each transaction to the SEC on Form 4 within two business days. The illegal version is trading on material non-public information in breach of a duty.
What makes information “material”?
A substantial likelihood that a reasonable investor would consider it important — pending earnings, mergers, major contracts, clinical trial results, leadership changes. Materiality is judged from the facts of each case, not from a checklist.
What is the short-swing profit rule?
Section 16(b) lets a company recover any profit an insider makes from opposite-direction trades within six months of each other, no proof of intent required. It applies automatically to directors, officers and 10% owners.
Can I see what insiders are trading right now?
Yes — every Form 4 is public on SEC EDGAR when accepted, and this site parses them into live feeds of insider buys and sales the same day, free and without an account.
Keep reading
- What is SEC Form 4? — SEC Form 4 explained: who must file it, the two-business-day deadline, what Tables I and II report, and how insider buys and sales become public record.
- How to read a Form 4 — A walkthrough of a Form 4 insider filing: the relationship boxes, every Table I and Table II column, the footnotes, and the Rule 10b5-1 checkbox.
- Form 4 filing deadlines — When a Form 4 is due: the two-business-day rule from Sarbanes-Oxley, EDGAR’s 10 pm cutoff, the narrow exceptions, and what actually happens to late filers.
- Form 3 vs Form 4 vs Form 5 — The three Section 16 ownership forms compared: Form 3 when you become an insider, Form 4 within two business days of a trade, Form 5 as the annual catch-up.
- Transaction codes — What each SEC Form 4 transaction code means — P, S, A, M, F, G and the rest — and which ones are real open-market trades.
- Rule 10b5-1 trading plans — What a Rule 10b5-1 trading plan is, the 2023 cooling-off and disclosure amendments, the Form 4 checkbox, and how to read planned versus discretionary trades.
- Reading insider buying — Which insider-buying patterns carry information according to the published research — cluster buys, purchase size versus stake, the buyer’s role — and which are noise.