The Signal Everyone Misreads

Insider buying sounds like a slam dunk until you learn how to read a Form 4. Executives sell for all kinds of reasons, diversification, tax bills, a new house, but they buy for essentially one reason: they think the stock is going up. That asymmetry is why the signal has any value at all, and why so many newsletters build entire pitches around it.

Michael Brush’s first teaser for Cabot Insider Edge, “I Just Found the 3 Stocks Behind $11.3 Million in Insider Buying,” is a case study in how the signal works and where it breaks down. Brush is a veteran financial journalist who edited Cabot Cannabis Investor before launching this letter, and the pitch is built on three names whose insider purchases add up to $11.3 million.

The Three Codes That Matter

Every insider trade gets filed on a Form 4, and the transaction codes are where the real information lives. An open-market purchase, coded P, is the strongest signal: the executive paid market price out of their own pocket because they chose to. An award, coded A, is usually compensation worth $0, a grant of shares that says nothing about conviction. An option exercise, coded M, just means someone is taking delivery of shares they already had the right to buy.

A lot of the “insider buying” you see in headlines is actually awards and exercises dressed up to look like conviction. The useful signal is the P, and the useful version of it is a cluster of C-suite executives buying at market prices in meaningful size at the same time.

Size Matters

The other filter is money. A director buying $20,000 of stock is a courtesy. A CEO buying $3 million against a $450,000 salary is a statement. The difference between those two is the difference between a signal and a footnote, and it is the reason the Cardinal Infrastructure (CDNL) piece of Brush’s pitch is the most interesting.

Cardinal insiders bought about $8.1 million, with the actual total above $9 million. The centerpiece is a roughly $3 million CEO buy against a $450,000 salary, which is the kind of personal bet that moves the needle. The stock had just fallen roughly 50% from a June high after the six-month lockup expired, a $320 million raise at $73 a share, and an August 11 quarter that beat on revenue but missed on earnings. When insiders buy into that kind of drawdown, it is worth noting.

The Cluster Across Three Names

The $11.3 million total is three piles added together. Cardinal is the biggest at $8.1 million. Fiserv (FISV) contributes about $2.2 million, a banking-tech and payments giant with the Clover point-of-sale business and roughly 80% recurring revenue. The stock has been derated from more than four times sales to under two times, trades around seven times forward earnings, and sits near $53.31 after falling 62% over the past year. A new CEO arrived in June, and insiders bought around $2.2 million.

Energy Fuels (UUUU) adds the last piece, roughly $1 million from a CEO making his biggest-ever personal purchase. It is a uranium producer that runs the White Mesa Mill, the only legacy U.S. uranium processing facility, and it is building a “mine to magnet” rare earths strategy by acquiring Vacuumschmelze, a German magnet maker, and Australian Strategic Materials. The stock trades near $14.75 with a market cap around $3.9 billion.

What the Research Actually Says

The honest version of the insider-buying story is that it is a modest signal, not a cheat code. The academic work points to something like 3% to 5% of outperformance over six to twelve months for cluster buying by C-suite executives at market prices. That is a real edge, but it is small enough to be swamped by a bad quarter or a higher interest-rate environment.

That is why the surrounding context matters more than the purchase itself. A cluster buy at a company with rising backlog is a different signal than a cluster buy at a company burning cash. The Cardinal story is where the signal either holds up or falls apart, and the Fiserv and Energy Fuels cases show the same mechanics at work.

The Verdict

Insider buying is a real, modestly positive signal when you filter it correctly: open-market purchases, meaningful size, and a cluster of C-suite names. Brush’s $11.3 million pitch checks those boxes across Cardinal, Fiserv, and Energy Fuels. The reminder is that the signal points you toward names worth studying, not toward automatic winners.

Ready to see the research? Click here to access Michael Brush’s report.

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