How to Compare Insider Buying Across Sectors

An insider purchase can be worth a closer look. It is not a verdict on a company, and a sector label does not make it one. If I compare buying across sectors, I first check what the Form 4 says and then compare similar companies over the same period.

The SEC's transaction code list defines code P as an open-market or private purchase. That distinction matters. A P-code filing is a starting point for review, not proof that someone bought shares on an exchange at the quoted market price.

Start with the transaction

Open the filing and check:

• Who bought: officer, director, or other reporting owner.
• What was bought: common shares, a derivative, or another security.
• When the trade happened: transaction date can differ from filing date.
• How much changed hands: shares and price, with the reported ownership after the trade.
• How the shares are held: direct or indirect ownership.
• What the footnotes say: they can explain a private transaction or another condition that changes the interpretation.

Do not mix purchases with grants, option exercises, gifts, or tax withholding. The SEC code definitions assign different codes to those transactions.

Build a fair sector comparison

One large sector can produce more filings simply because it has more public companies. A fair comparison needs a fixed company list, a stated classification, and a period. Then it can report both the total purchases and how many companies had at least one purchase.

Measure	What it helps answer	Check before you use it
Companies with a reported P-code purchase	How widespread reported buying was	Company coverage and sector size
Purchase filings per company	Whether activity was concentrated	Multiple filings by one person
Reported purchase value	The size of reported transactions	Missing prices, derivatives, and private deals
Change from an earlier period	Whether a company's pattern changed	A consistent period and company set

For dollar totals, state how you handle filings without a clear price and transactions in other currencies. A single large purchase can dominate a sector total, so show both totals and the distribution across companies.

Read the company before the sector

If several officers at one company buy within a short period, inspect each Form 4. Check whether the transactions are independent, whether any are private purchases, and whether the company disclosed another event near the same dates.

Next, compare that company with its own filing history. A sector average can help you ask a question, but it cannot tell you why an individual bought. Insiders may buy for different reasons, and public filings do not reveal every motive.

How to use Earnings Feed

Start with the insider feed, open a Form 4, and read the transaction details and footnotes. You can use a watchlist to follow the companies you care about. When you see a cluster, compare the filings with the company's earlier activity and current disclosures.

This article does not rank sectors by insider buying. A ranking would need a defined dataset, company coverage, dates, classification rules, transaction filters, and downloadable results. Without those, precise sector percentages would imply evidence that readers cannot check.

For the form basics, read how Form 4 works. The original SEC filing is the authoritative source.