What does this tool show?

The tracker above analyzes the most recent insider transactions at US-listed companies. You can see the largest buys and sells of the past weeks, so-called cluster buys — cases where several insiders purchase shares of the same company at the same time — and a table of individual transactions with date, type (buy or sell), the insider’s name and role, share count, price, and total value.

Where does the data come from?

The source is Form 4 filings with the US Securities and Exchange Commission: executives, board members, and shareholders holding more than ten percent must disclose trades in their own company’s stock within two business days. BMInsider reads these mandatory filings automatically from the SEC’s EDGAR database and refreshes the tracker once a day. Everything shown here is therefore legal, officially reported insider activity.

How to interpret the data

The most important rule of thumb in insider analysis: buys carry more information than sells. Insiders sell for many reasons — taxes, a house purchase, diversification, or pre-scheduled 10b5-1 selling plans. They buy for essentially one reason: they consider their own stock undervalued. The signal is strongest with cluster buys, for instance when the CEO, the CFO, and several directors step in independently of each other, and with purchases that are large relative to the insider’s salary. The role matters too: a CFO usually knows the financial position better than an outside board member.

Two practical examples

Example 1 — validating a buy idea: You are watching a stock that dropped 30 percent after weak quarterly results. In the tracker you notice that three insiders bought several million dollars’ worth of shares shortly after the sell-off. That does not replace your own analysis, but it suggests management considers the sell-off overdone.

Example 2 — spotting a warning sign: A stock in your portfolio keeps printing new highs, yet the sell list shows the CEO and CFO simultaneously making unusually large sales that do not fit a regular selling plan. That is a reason to re-examine the valuation critically and at least consider taking profits.

Risk note

Insiders are by no means always right — executives buy too early and sell too late as well, and filings reach the public with a delay of up to two business days. Insider data works as one building block among several, not as a standalone buy signal. All information is provided for educational purposes and is not investment advice.

Form 4 in detail: who must report what

The legal basis for the data above is Section 16 of the US Securities Exchange Act. It covers three groups: officers with executive responsibility, members of the board of directors, and shareholders who own more than ten percent of a company’s stock. They must report every transaction in their own company’s securities to the SEC on Form 4 within two business days. Each filing carries a transaction code, and the codes are worth knowing: a “P” marks a genuine open-market purchase, “S” a sale, “M” the exercise of stock options, and “A” shares granted under a compensation plan. The distinction matters, because only voluntary open-market trades reveal anything about an insider’s expectations — a share award from a bonus program says nothing about conviction. Form 4 filings land in the SEC’s EDGAR database in machine-readable form, which is exactly what makes automated trackers like the one above possible.

Directors’ dealings in Europe: Article 19 MAR

Europe has an equivalent regime. Under Article 19 of the EU Market Abuse Regulation (MAR), executives and supervisory board members of listed companies — together with closely associated persons such as spouses — must report transactions in their company’s shares or debt instruments within three business days, both to the issuer and to the national regulator. The duty applies above a de-minimis threshold of 5,000 euros per calendar year, which member states may raise to 20,000 euros, as Germany has done. These so-called directors’ dealings are published by regulators such as BaFin, the AMF, Consob, and the CNMV, and the same logic of interpretation applies to them. The tracker above focuses on the US market simply because the data there is the deepest, fastest, and most standardized.

What the research says

Academic studies have dissected insider trades for decades, with remarkably consistent findings: stocks that insiders buy outperform the market on average over the following six to twelve months, while insider sales have little predictive power. The signal is strongest in three situations — purchases in small companies with thin analyst coverage, unusual or “opportunistic” trades rather than routine ones that recur every year in the same month, and buys by executives with direct profit-and-loss responsibility, above all the CEO and the CFO. Researchers explain the asymmetry simply: insiders know their company’s order book, margins, and product pipeline better than any outside analyst — and they only commit their own private money when they like what they see.

Common pitfalls when reading the data

Not every reported “buy” is a real buy. Option exercises that are followed by an immediate sale are compensation in motion, not conviction. Sales executed under pre-scheduled 10b5-1 trading plans were set up months in advance and say little about current expectations. And occasionally executives make small, well-publicized token purchases precisely because they know the market watches insider buying — which is why you should always judge the size of a purchase relative to the insider’s salary and existing stake. Mind the timing, too: by the moment a filing becomes public, the share price has often already reacted. Used properly, insider data is a screening and confirmation tool that tells you where a closer look is worthwhile — not a mechanical buy signal.