Investor concerns about slower data-center growth have accompanied a $4.2 trillion loss in the aggregate value of related companies since June, a decline that has hit U.S. cooling and fiber-optic suppliers.
The group spans businesses in manufacturing, utilities and mining. Its aggregate value had climbed by $9.4 trillion over the prior 12 months, and the recent retreat has undone close to half of that advance.
Comfort Systems USA installs heating and air-conditioning systems, while Corning makes fiber-optic products. Both companies have fallen about 50% from earlier peaks. Allient is 35% below its October record; it makes motion-control products.
The group has faced pressure amid a tech-stock selloff and concern about AI demand and slower data-center growth. Investors are also weighing the cash-flow burden of technology companies’ heavy AI budgets, possible local curbs on data-center projects and tighter monetary policy.
