How quickly is insider buying reported?

Within two business days of the trade, on a Form 4 filed with the SEC. The filing is public immediately on EDGAR. Before 2002 the deadline was the tenth of the following month; the Sarbanes-Oxley Act shortened it, which is why the data is now close to real time.

What is a 10b5-1 plan?

A pre-arranged schedule for buying or selling company stock, set up by an insider at a time when they hold no material non-public information. Trades under the plan then execute automatically. Sales under a plan carry almost no information because the timing was set months earlier. Form 4 filings note when a trade was under a plan.

Do insider purchases predict stock returns?

In aggregate, modestly, over months rather than days. The academic record since the 1970s is consistent: open-market purchases, especially by several insiders and in smaller companies, are followed by above-market returns on average. The effect is an edge, never a guarantee, and it is strongest for clusters after declines.

Where can I see insider buying for a specific stock?

On EDGAR, by searching the company's filings for Form 4. Or on a tracker that groups the filings by ticker and flags open-market purchases. The free per-name pages here show recent insider activity for the covered tickers, read from the filings.

How do you tell a meaningful insider buy from a token one?

Compare the dollar amount to what the person already owns and to their pay. A director adding ten thousand dollars to a stake worth millions is a gesture. A chief executive putting a year of salary into the open market is a decision.

Why does a chief financial officer's purchase carry more weight?

Because the finance chief sees the numbers before anyone outside the company does, including the quarter taking shape. A purchase from that seat is the hardest one to explain as general optimism about the industry. Directors sit further from the detail.

When do insiders usually buy?

In the open window that follows an earnings release, when the company allows trading. That is why purchases arrive in waves a few days after results rather than spread evenly through the quarter.

Is it legal for executives to buy their own stock?

Yes, as long as they are not acting on material non-public information and they report the trade on time. The reporting is what makes the purchase visible to everyone else.

What happens if an insider buys just before bad news?

The SEC looks at it, and so do plaintiff lawyers. Buying ahead of news the insider already knew about is the textbook violation, and the timing is easy to see once the Form 4 and the announcement sit side by side. That scrutiny is one reason honest purchases cluster in open windows.

Does insider buying mean as much in a small company?

It can mean more, because a founder or a chief executive at a small company often owns a large share of it and knows every customer by name. The trade is also easier to spot, since one purchase can be large next to the daily volume.

How do you read insider buying, and when does it matter?

By Daniel, The Philosopher Investor · updated September 18, 2026

Insider buying is a purchase of company stock on the open market by an officer, director or ten percent holder, reported on a Form 4 within two business days. It matters when it is a cluster of several insiders buying with their own money, in size relative to their holdings, after a decline. Sales carry far less information because insiders sell for many reasons.

Who counts as an insider, and what do they file?

Section 16 of the Securities Exchange Act covers a company's officers, its directors and anyone holding more than ten percent of a class of stock. Every time one of them buys or sells the company's shares they file a Form 4 with the SEC, due by the end of the second business day after the trade. The filing shows the date, the number of shares, the price, and the holdings after the trade.

Form 4s are public the moment they are filed, on EDGAR, and trackers read them within minutes. Unlike Congress disclosures the lag is short, so the data is close to current. The volume is large: thousands of filings a week across the US market, most of them routine.

Which purchases carry information?

Open-market purchases with the insider's own cash. The Form 4 transaction code is P for these. Everything else is weaker: option exercises, restricted stock vesting, shares received under a plan, purchases through a dividend reinvestment. Those are compensation mechanics, and they happen on a schedule regardless of what the insider thinks.

Size relative to the insider's existing position is the second filter. A CEO who owns two million shares buying five thousand is making a gesture. A director who owns twenty thousand buying twenty thousand has doubled down. The dollar figure alone misleads because insiders' wealth varies so much.

Why do sales say so little?

Insiders sell to diversify, to pay taxes on vested stock, to buy a house, to fund a divorce, or because a pre-arranged 10b5-1 plan sold on schedule. Only one of the many reasons to sell is a negative view of the company. Studies of insider transactions consistently find that purchases predict returns and sales, in aggregate, do not.

The exception is a sale that breaks pattern. An insider who has never sold, selling a large share of holdings outside any plan, shortly after a run-up, is worth a look. Even then it is a question rather than a signal.

What is a cluster buy?

Three or more insiders buying on the open market within a short window, typically a few weeks. It is the single pattern in insider data with the most consistent record. One insider can be wrong or be making a gesture. Several insiders, each with their own view of the business, each spending their own money, agreeing at the same time is a different thing.

Clusters after a decline are the strongest form. The stock has fallen, the people who know the business best are buying, and they are doing it together. The trade that follows is still a trade, with all the usual risks, but the odds have shifted.

How do you use it?

As a screen and a confirmation, never as a trigger. A cluster buy puts a name on the list. The chart then has to make sense, and the reason for the decline has to be one the insiders could plausibly see through. Insiders are early, often by months, and a stock can keep falling after they buy.

Watch the same names for follow-through. An insider who bought in March and buys again in June, at a lower price, is telling you something twice. Repeated purchases by the same person over a year is the slow, patient version of the cluster, and it has a similar record.

Common questions

How quickly is insider buying reported?: Within two business days of the trade, on a Form 4 filed with the SEC. The filing is public immediately on EDGAR. Before 2002 the deadline was the tenth of the following month; the Sarbanes-Oxley Act shortened it, which is why the data is now close to real time.
What is a 10b5-1 plan?: A pre-arranged schedule for buying or selling company stock, set up by an insider at a time when they hold no material non-public information. Trades under the plan then execute automatically. Sales under a plan carry almost no information because the timing was set months earlier. Form 4 filings note when a trade was under a plan.
Do insider purchases predict stock returns?: In aggregate, modestly, over months rather than days. The academic record since the 1970s is consistent: open-market purchases, especially by several insiders and in smaller companies, are followed by above-market returns on average. The effect is an edge, never a guarantee, and it is strongest for clusters after declines.
Where can I see insider buying for a specific stock?: On EDGAR, by searching the company's filings for Form 4. Or on a tracker that groups the filings by ticker and flags open-market purchases. The free per-name pages here show recent insider activity for the covered tickers, read from the filings.
How do you tell a meaningful insider buy from a token one?: Compare the dollar amount to what the person already owns and to their pay. A director adding ten thousand dollars to a stake worth millions is a gesture. A chief executive putting a year of salary into the open market is a decision.
Why does a chief financial officer's purchase carry more weight?: Because the finance chief sees the numbers before anyone outside the company does, including the quarter taking shape. A purchase from that seat is the hardest one to explain as general optimism about the industry. Directors sit further from the detail.
When do insiders usually buy?: In the open window that follows an earnings release, when the company allows trading. That is why purchases arrive in waves a few days after results rather than spread evenly through the quarter.
Is it legal for executives to buy their own stock?: Yes, as long as they are not acting on material non-public information and they report the trade on time. The reporting is what makes the purchase visible to everyone else.
What happens if an insider buys just before bad news?: The SEC looks at it, and so do plaintiff lawyers. Buying ahead of news the insider already knew about is the textbook violation, and the timing is easy to see once the Form 4 and the announcement sit side by side. That scrutiny is one reason honest purchases cluster in open windows.
Does insider buying mean as much in a small company?: It can mean more, because a founder or a chief executive at a small company often owns a large share of it and knows every customer by name. The trade is also easier to spot, since one purchase can be large next to the daily volume.

Primary sources

SEC, list of forms including Form 4 · www.sec.gov
SEC EDGAR, filings search · www.sec.gov
SEC investor education · www.investor.gov

See it on a real name

Insider activity on NVDA, free → Congress trades, the political version → Best Congress trades tracker →

Try the app free

How the picks are made →