By size

US insider buying by company size

The same disclosed buying, split by how big the company is. A chief executive putting $100,000 into a $20bn company and into a $50m one are not the same act, and the size of the business is most of the difference.

ddbx started recording disclosures in March 2026, so periods described as a full year cover only the filings since then.

• Large-cap companies — 62 companies, 172 purchases, $600m Companies valued at $10bn or more. The biggest listed companies, where a director's own purchase is small against the share register and the signal is about conviction rather than control. Buying here is rarer and usually more deliberate.
• Mid-cap companies — 85 companies, 165 purchases, $60m Companies valued between $2bn and $10bn. Companies big enough to be well covered and small enough that a board still moves the register. This is where insider buying is most often read as a view on the business rather than on the sector.
• Small-cap companies — 192 companies, 425 purchases, $311m Companies valued under $2bn. Smaller listings, where insiders are often the largest holders and a single purchase can be a meaningful share of daily volume. The buying is more frequent here, and so is the noise.

Of the 349 companies with disclosed buying, 10 have no market value on file. Those are left unbanded rather than guessed at.

How the bands are drawn

• Bands are set on market value in the company's own currency, using the thresholds printed on each page. They are conventional lines rather than derived ones, and they differ by market on purpose — the value that makes a US company small-cap makes a UK one solidly mid-sized.
• Market value is refreshed daily from the same source the company pages use. A company that has moved between bands since its insiders bought is shown where it sits today, not where it sat then.
• Companies with no market value on file are not placed in a band, and neither are those reporting in a currency other than the market's own — there is no exchange rate anywhere in this system, and converting one would be inventing a number. Both counts are stated.
• Totals cover the disclosed purchases the company index counts, in the market's own currency, and are never converted between markets.
• This page counts from the company index, which is marginally wider than the leaderboards: it has no way to tell a company officer from a large outside shareholder, so a US purchase by a 10% holder is included here and excluded from the biggest-buys and cluster boards. Where the two disagree, the boards apply the stricter test.

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