Shares of Vertiv Holdings LLC, the maker of cooling equipment for data centers, surged 18% in premarket trading Wednesday after the company posted strong first-quarter earnings and raised its full-year sales guidance.

Adjusted earnings of 64 cents a share topped the 61 cents a share Wall Street was looking for, according to FactSet. Sales grew 24% from the prior year to $2.04 billion, above the $1.94 billion analysts had forecasted.

Vertiv raised its 2025 net sales guidance by $250 million at the midpoint, citing robust momentum and strong AI-driven demand. The company said it now expects sales between $9.325 billion and $9.575 billion, compared with an earlier range of $9.125 billion to $9.275 billion.

"The tariff situation remains fluid, but we are proactively working to mitigate the impact with supply chain countermeasures, production flexibility and commercial actions," Vertiv said.