Western Digital stock slid more than 10% in late trading Wednesday after the hard-drive maker reported excellent quarterly earnings. The after-hours selloff points to the elevated expectations facing suppliers of the artificial-intelligence boom.

The stock had surged 201% this year ahead of the earnings print.

While the results show the continued need for data storage as part of the AI supply chain, the reaction to the company’s somewhat conservative guidance indicates that investors remain wary about a potential slowdown.

Western Digital reported adjusted earnings of $3.56 a share for its fiscal fourth quarter, surpassing the $3.31 analysts had expected, per FactSet. Revenue totaled $3.75 billion, up 42% from a year ago and ahead of Wall Street’s call for $3.7 billion.

Guidance was good but not great. The company expects revenue of $4.1 billion, plus or minus $100 million, and adjusted earnings per share of $3.85 to $4.15 in the current quarter. Analysts had expected revenue of $4.06 billion and adjusted earnings of $3.84 a share.

Western Digital’s outlook wasn’t as far above forecasts as that of hard-drive rival Seagate Technology, which reported earnings last week.