# Insider Buying: How to Read Form 4 and What Insider Trades Tell You Web page: https://uptickflow.com/en/learn/insider-buying Updated: 2026-11-08 Insider buying explained: who counts as an insider, SEC Form 4 and its two-day deadline, buying vs selling, 10b5-1 plans, cluster buys and illegal insider trading. Insider buying is the legal purchase of a company’s shares by its own officers, directors or largest owners, reported publicly to the SEC. In the US, these insiders must file a Form 4 before the end of the second business day after a trade, so anyone can see what they bought or sold, at what price and how much they own afterwards. An insider who spends their own cash on the open market is the trade many investors look for, because it is a choice, while most insider sales happen for reasons that say little about the company. Below: who counts as an insider, the Form 4 deadline, how to read a filing line by line, buying vs selling, cluster buying, Rule 10b5-1 plans and their cooling-off periods, and the line between legal insider trades and illegal insider trading. Facts are as of November 2026; companies and numbers in the examples are hypothetical, and this is education, not investment advice. ## What is insider buying, and who counts as an insider? For reporting purposes, an insider is an officer or director of a company with registered stock, or anyone who owns more than 10% of a registered class of its shares. These are often called Section 16 insiders, after the section of the Securities Exchange Act of 1934 that requires the reports. Ordinary employees are not covered just because they own shares. An insider files Form 3 on first becoming an insider, Form 4 for each change in holdings, and Form 5 once a year for certain transactions not reported earlier. Section 16 also has a short-swing rule: profits an insider makes from a purchase and a sale, or a sale and a purchase, within six months can be claimed back by the company. That is one reason insiders rarely trade their own stock for quick gains. - **Corporate insider (Section 16 insider)**: An officer or director of a company with registered stock, or an owner of more than 10% of a registered class of its equity, who must report trades in the company’s shares to the SEC. - **Insider buying**: The legal purchase of a company’s shares by one of its insiders, reported on Form 4. Open-market purchases with the insider’s own money carry the transaction code P. ## What is SEC Form 4, and when is it due? Form 4 is the Statement of Changes in Beneficial Ownership. It must be filed before the end of the second business day after the day the trade was executed, and it appears on the SEC’s EDGAR database, free to search by company or by insider. In the drawing below, a hypothetical director buys on a Thursday. Friday is business day 1, Saturday and Sunday do not count, and Monday is business day 2, the deadline. Market holidays do not count either. For a few specified transactions, such as some trades made under a pre-arranged plan, the rules set a later date as the execution date, so a Form 4 can arrive a few days after the trade itself. Since the 2023 amendments, bona fide gifts of shares are also reported on Form 4 rather than waiting for the annual Form 5. - **Form 4**: The SEC filing in which an insider reports a change in holdings, due before the end of the second business day after the trade. Table I lists shares, Table II derivatives such as options. ## How do you read a Form 4? A line-by-line example The drawing at the top of the page shows one line from Table I for a hypothetical director of XYZ. Read it from left to right: - Transaction date 11/05/2026: the trade date, which starts the two-business-day clock. - Code P: an open-market or private purchase. Other common codes are S for a sale, A for a grant or award from the company, M for exercising an option, F for shares withheld to pay the exercise price or tax, and G for a gift. - Amount 20,000 and A: 20,000 shares acquired. D would mean disposed of. - Price $25.00: so the purchase cost 20,000 × $25.00 = $500,000 of the director’s money. - Owned after 120,000: the holding grew from 100,000 to 120,000 shares, +20.0%. A purchase that is large next to the insider’s existing stake says more than a token one. - The 10b5-1 box at the top of the form: ticked when the trade was made under a pre-arranged plan; the plan’s adoption date then appears in the explanation of responses. - **Form 4 transaction code**: A letter that says what kind of trade a Form 4 line reports: P open-market or private purchase, S sale, A grant or award, M option exercise, F shares withheld for the exercise price or tax, G gift. ## Insider buying vs insider selling: why do sales say less? Insiders sell for many reasons that have nothing to do with the outlook: to pay the tax due when shares vest, to diversify when most of their wealth sits in one stock, to buy a house, or because a pre-arranged plan sells on a schedule. Many Forms 4 that look like selling are code F, shares the company withheld for tax, or code M followed by S, an option exercised and sold. Buying is different. Code P means the insider took cash from their own account and bought at the market price, the same price you would pay. That is why many investors read insider buying as a clue worth researching and give routine selling less weight. It is still only a clue. Insiders can be early, can be wrong, and see their own company more favourably than an outsider might; check the business itself with [how to read earnings reports](https://uptickflow.com/en/learn/how-to-read-earnings-reports). ## What is cluster buying? Cluster buying is when several insiders of the same company buy on the open market within a short period. In the drawing below, four hypothetical XYZ insiders buy within 6 trading days: the CEO $250,000, the CFO $100,000 and two directors $400,000 and $150,000, a total of $900,000. One person can have personal reasons to buy; several separate people spending their own money at the same time is harder to explain away. The drawing also shows a $300,000 sale weeks earlier under a pre-arranged plan, which says less. And the price keeps moving sideways after the cluster: insider buying is not a timing signal, and a stock can keep falling after insiders buy. Compare the buys with each person’s holding, check whether the company has just reported or raised money (see [stock dilution](https://uptickflow.com/en/learn/stock-dilution)), and look at any [buyback](https://uptickflow.com/en/learn/stock-buybacks) the company itself is running. - **Cluster buying**: Open-market purchases by several insiders of the same company within a short period, usually read as a stronger clue than a single insider’s purchase. ## What is a 10b5-1 plan, and what is the cooling-off period? A Rule 10b5-1 plan is a written plan, set up while the insider has no material nonpublic information, that buys or sells shares later by a formula or a schedule. A trade made under a qualifying plan has an affirmative defence against insider trading claims, which is why many executives sell this way. The SEC tightened the rule in amendments adopted on December 14, 2022, effective February 27, 2023. The biggest change is a cooling-off period before the first trade. For directors and officers, trading cannot begin until the later of 90 days after the plan is adopted or two business days after the company files its 10-Q or 10-K with results for the quarter in which the plan was adopted, but never more than 120 days. For other insiders, the wait is 30 days. In the drawing below, a plan adopted on February 2, 2026 can first trade on May 8 for an officer, two business days after a May 6 10-Q, and on March 4 for another insider. The amendments also allow only one single-trade plan in any 12 months, restrict overlapping plans, require directors and officers to certify that they have no material nonpublic information when they adopt a plan, and add the Form 4 checkbox. Companies must also disclose each quarter when their directors and officers adopt or end such plans. - **Rule 10b5-1 plan**: A pre-arranged written plan to buy or sell a company’s shares, adopted in good faith without material nonpublic information, that gives the trades an affirmative defence against insider trading claims. - **Cooling-off period**: The wait before the first trade under a new or modified 10b5-1 plan: for directors and officers, the later of 90 days or two business days after the next 10-Q or 10-K, up to 120 days; 30 days for other insiders. ## Legal insider trades vs illegal insider trading: where is the line? Insider trading in everyday speech means two different things. The legal kind is everything above: insiders buying or selling their own company’s shares and reporting it on time. The illegal kind is buying or selling a security on the basis of material nonpublic information, such as unannounced earnings or a pending takeover, in breach of a duty to keep it confidential. Passing such a tip to someone who trades on it can be illegal for both people. The SEC brings civil cases, and serious cases can also be prosecuted as crimes by the Department of Justice. For an ordinary investor, the practical lesson cuts both ways: Form 4 data is public and fair to use, while a tip about news that has not been announced is not. Be wary too of social media posts that claim insider knowledge to push a stock; see [pump and dump schemes](https://uptickflow.com/en/learn/pump-and-dump). - **Material nonpublic information (MNPI)**: Information that has not been made public and that a reasonable investor would consider important to a decision to buy or sell, such as unannounced earnings or a pending merger. - **Illegal insider trading**: Buying or selling a security on the basis of material nonpublic information in breach of a duty of trust or confidence, or tipping someone who trades on it. ## Key takeaways - Insiders are officers, directors and owners of more than 10%; they report trades on Form 4 before the end of the second business day after the trade. - Code P, an open-market purchase with the insider’s own money, is the line most investors look for; most sales are for tax, diversification or a plan. - Cluster buying by several insiders is a stronger clue than one purchase, but it is not a timing signal. - Since February 27, 2023, 10b5-1 plans carry a cooling-off period: up to 120 days for directors and officers, 30 days for other insiders. - Reporting your own trades is legal; trading on material nonpublic information is not. ## FAQ **Is insider buying a good sign?** It can be a clue worth researching, especially open-market purchases that are large next to the insider’s holding or several insiders buying together. It is not a buy signal on its own: insiders can be early or wrong, and the price can keep falling after they buy. **How quickly do insiders have to report trades?** A Form 4 is due before the end of the second business day after the trade. For a few specified transactions, such as some trades under a pre-arranged plan, the rules use a later execution date, so the filing can come a few days after the trade. **Where can I find insider trades for free?** Every Form 4 is published on the SEC’s EDGAR database, searchable by company or by person. Many market data sites collect the same filings into tables of recent insider buying and selling. **Why do executives sell so much stock?** Much of their pay comes in shares, so selling is how they pay tax on vesting, diversify and spend. Many sales run through 10b5-1 plans set up months earlier. A sale is worth a closer look mainly when it is unusually large, outside a plan, or joined by several other insiders. --- Educational content, not financial advice. Trading involves risk of loss. https://uptickflow.com/llms.txt