Cardinal Infrastructure Stock: What You Need to Know

The Hook

Cabot Insider Edge is the new letter from Michael Brush, a veteran financial journalist who edited Cabot Cannabis Investor for years before launching this one this summer. His first teaser pitch is titled “I Just Found the 3 Stocks Behind $11.3 Million in Insider Buying,” and the largest single slice of that total sits with Cardinal Infrastructure (CDNL).

Cardinal is a Southeast construction-services rollup that went public in December 2025 at $21 a share. The company is vertically integrated, which means it keeps the full chain of construction work in house rather than handing pieces off to subcontractors. The promo frames it against two familiar names: Sterling Infrastructure, the data-center builder that has been one of the sector’s biggest winners, and Construction Partners, a regional construction rollup that works the same part of the country.

The share price has been a rollercoaster. The stock climbed from the IPO to a June high, then collapsed roughly 50% after three things hit in sequence: the six-month lockup expired, the company completed a $320 million raise priced at $73 a share, and the August 11 quarter beat on revenue but missed on earnings and margins. The shares slid from the $90s into the $30s, closing near $36.98 on August 31. That left the Class A market cap around $755 million.

The pitch leans on a specific set of numbers: earnings up 114%, backlog up 35%, and management guiding toward 95% revenue growth. Those figures come from the company’s own filings, and they paint a growth story that sounds impressive when read in isolation.

The teaser also points to the insider buying as the real hook. The promo says insiders bought about $8.1 million of stock, though the actual figure works out to more than $9 million. Either way, the headline item is a roughly $3 million purchase by the CEO against a $450,000 salary. That is a meaningful personal commitment, and it is the kind of buy that gets flagged as a signal rather than as noise.

The Insider Buying

Cluster buying matters more than a single purchase, and this is a cluster. When C-suite executives buy stock at market prices in meaningful size, the research suggests a modest tailwind, on the order of 3% to 5% over the next six to twelve months. It is not a dramatic edge, but it is a real one, and a $3 million CEO buy against a $450,000 salary is at the high end of what you usually see.

The nuance lives in the Form 4 codes. An open-market purchase, coded P, is the strongest signal. An award, coded A, is usually compensation worth $0, and an option exercise, coded M, just means an executive is taking delivery of shares they already earned. The Cardinal buying appears to be genuine open-market activity, which is why the promo can make the case with a straight face.

The Dual-Class Catch

This is the part of the story the teaser saves for the fine print. Cardinal has a dual-class structure. The founder and family control about 27.5 million non-traded Class B shares alongside roughly 20 million trading Class A shares. The two classes do not carry the same economics, and that shows up on the income statement.

On a consolidated basis, net income lands near $37 million. Only about $18 million is attributable to common shareholders. The gap is the cost of the dual-class setup, and it means the per-share math the promo presents is built on the Class A slice rather than on the whole company. A multiple can look cheap while the common holders capture only half of the profit.

Does the Math Check Out?

The bull case is that Cardinal trades around 18 times forward earnings, which reads as cheaper than Sterling Infrastructure at roughly 20 times. The comparison is flattering, but it is also imperfect. Cardinal is not really a data-center builder today. It is more of a housing-development bet, with revenue tied to residential and commercial work across the Southeast.

At $36.98, with a Class A market cap near $755 million, the stock is not obviously expensive and not obviously cheap. The August quarter was the tell: revenue beat, but earnings and margins missed, which is why a company can post growth and still see its shares fall. The insider buying is a genuine positive, but it has to be weighed against the dual-class discount and the margin disappointment. We walked through the broader construction sector and the narrow data-center construction angle separately, and the data-center buildout itself is a story worth keeping an eye on.

The Verdict

Michael Brush found a real cluster of insider buying at a company that has already given back half its value. The CEO’s $3 million buy against a $450,000 salary is a strong signal, and the backlog and revenue-growth figures are not invented. The catch is the dual-class structure, the earnings miss, and a story that is more housing development than the data-center halo the promo leans on.

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