Indoor Air Quality Stocks Surge Again... New York Startup Soars 6% in One Day

Madison Air Solutions Corporation (NYSE: MAIR) closed at $39.50 on May 30, up 6.3%. Its market capitalization swelled to approximately $6.99 billion (about KRW 10.8 trillion), adding roughly $470 million (around KRW 700 billion) in a single day. Trading volume stood at 1.506 million shares, reflecting the strong demand typical of a newly listed stock.

On May 12, the company reported its first-quarter results: revenue of $923.7 million (about KRW 1.4 trillion), a 33.8% year-over-year increase. It also highlighted a 115.5% rise in its order backlog and 29.1% growth in new orders to underscore its growth trajectory. More recently, Madison Air Solutions repriced about $1.35 billion (just over KRW 2 trillion) of long-term debt, reducing its interest margin by one percentage point, and repaid $249 million (approximately KRW 380 billion) of principal, accelerating post-IPO balance sheet improvements.

Founded in 2017 and headquartered in Chicago, Madison Air Solutions supplies commercial and residential heating, air purification, and HVAC equipment under brands such as Lennox, AprilAire, and Big Ass Fans. The company spun off from parent Madison Industries Holdings and debuted on the New York Stock Exchange on April 16, marking one of the largest U.S. IPOs of 2026.