The industrial sector just had its biggest IPO moment since 1999, and artificial intelligence deserves much of the credit.
Madison Air Solutions Corp. (NYSE: MAIR) debuted on the New York Stock Exchange Thursday, raising $2.23 billion after pricing 82.7 million shares at $27 each — the top of its marketed range. By early afternoon, shares were trading around $31.26, a 16% pop that gave the Chicago-based ventilation and filtration systems provider a market capitalization of approximately $13.2 billion.
The last time a US industrial company pulled off an IPO of this magnitude was when UPS raised $5.5 billion in 1999 — a listing that rode the wave of early e-commerce enthusiasm. Madison Air is riding a different wave: the data center buildout fueling the AI boom.
While the company operates across more than 30 brand names — including Nortek Data Center Cooling, Airxchange and Zephyr — and generates revenue from sectors spanning semiconductor manufacturing and life sciences, it is the data center angle that captured investor attention. Data centers account for roughly 20% of Madison Air’s commercial business, and that segment drove about two-thirds of total revenue in 2025. The company’s liquid, hybrid and air cooling products are increasingly critical infrastructure as hyperscalers race to build out AI compute capacity.
The pitch landed. Madison Air is entering the public markets at a moment when HVAC and thermal management companies tied to the data center buildout have become some of the most sought-after names in industrials. Comfort Systems USA surged more than 360% in the 12 months through Wednesday, while Modine Manufacturing roughly tripled over the same period. Madison Air’s IPO is the latest — and largest — in a string of high-profile industrial debuts, following Legence Corp., which surged 148% from its September IPO through Wednesday, and Forgent Power Solutions, which is up 20% since its February debut.
The company posted revenue of $3.34 billion and net income of $124 million for 2025, compared with $2.62 billion in revenue and $236 million in net income the year prior. The margin compression is worth noting — net income fell despite revenue growth — as tariffs added $51.3 million to the company’s cost of goods sold last year. CEO Jill Wyant said Madison Air is offsetting those pressures through pricing adjustments and is still evaluating the impact of more recent tariff changes on metals.
Founder Larry Gies retains control of the company through super-voting shares following the IPO. Madison Industries, which Gies controls, also participated in a concurrent $100 million private placement at the IPO price. The deal was led by Goldman Sachs, Barclays, Jefferies and Wells Fargo, with anchor interest from Morgan Stanley Investment Management, Durable Capital Partners and HRTG GPE — institutions that collectively expressed interest in up to $525 million of shares ahead of the offering.
Madison Air is not a small-cap story — at $13.2 billion, it clears the threshold by a wide margin. But its market debut matters to small and microcap investors for a clear reason: it validates the investability of the broader AI infrastructure supply chain at scale. The companies supplying cooling systems, filtration and thermal management to data centers — many of them smaller, less-covered names — are operating in what Madison Air estimates is a $40 billion market for specialized air systems. When an IPO of this size trades up 16% on day one, it sends a signal about where institutional capital is flowing. The picks-and-shovels trade around AI infrastructure is far from over.
