Bel Fuse Inc. (BELFA) experienced a significant surge of 14.79% in the after-hours session following the release of its fourth-quarter financial results for 2025.

The electronics manufacturer reported quarterly non-GAAP earnings of $1.88 per share, surpassing analyst estimates of $1.58. Revenue for the quarter reached $175.9 million, exceeding expectations of $172 million and marking a 17.4% increase from the same period last year. The company's gross profit margin also improved to 39.4%, up from 37.5% a year earlier.

Management attributed the strong performance to robust demand across commercial aerospace and defense sectors. Additionally, the company provided an optimistic outlook for the first quarter of 2026, forecasting sales between $165 million and $180 million, which is above the consensus estimate of $164.9 million. This combination of earnings beats, margin expansion, and positive forward guidance drove investor optimism in extended trading.