Keysight Technologies, Inc. (KEYS) had a pretty excellent Monday evening, delivering fourth-quarter results that sailed past Wall Street's expectations and sending the stock up more than 13% in extended trading.

The electronic measurement company posted earnings of $1.91 per share for the quarter, beating the analyst consensus of $1.83. Revenue came in at $1.42 billion, topping expectations of $1.38 billion. That's the kind of double beat that gets investors excited.

Breaking Down the Business Segments

Both of Keysight's major divisions showed solid momentum. The Communications Solutions Group pulled in $990 million in quarterly revenue, an 11% jump from the prior year. The growth story here centers on what's hot right now: AI data center infrastructure buildouts, non-terrestrial network applications, and defense modernization spending.

Meanwhile, the Electronic Industrial Solutions Group contributed $429 million in revenue, up 9% year-over-year. That segment is benefiting from strength in general electronics and particularly in leading-edge semiconductor solutions, where testing equipment remains critical as chips get more complex.

"Keysight delivered an outstanding quarter and strong close to the fiscal year, returning the company to full-year growth with order momentum accelerating through the year," said Satish Dhanasekaran, the company's CEO.

Looking Ahead

The real excitement came from Keysight's first-quarter guidance, which suggests this momentum isn't slowing down. The company expects adjusted earnings between $1.95 and $2.01 per share—meaningfully above the $1.83 analyst estimate. Revenue is projected at $1.53 billion to $1.55 billion, compared to the Wall Street consensus of $1.42 billion.

That guidance gap tells you management sees something analysts might have been missing about the demand environment.

Keysight shares jumped to $201.24 in after-hours trading Monday, up 13.27% from the regular session close. Not bad for an evening's work.