Axcelis Technologies' stock experienced a significant 10.73% decline in post-market trading following the release of its fourth-quarter 2025 financial results and first-quarter 2026 guidance.

The semiconductor equipment company reported Q4 revenue of $238.3 million, surpassing analyst expectations of $215 million, and adjusted earnings per share of $1.49, beating the consensus estimate of $1.12. However, the company's product revenue for the quarter declined 7% year-over-year to $224.60 million.

The sharp stock price decline appears primarily driven by the company's guidance for the first quarter of 2026. Axcelis expects revenue of approximately $195 million, along with GAAP diluted earnings per share of about $0.38 and non-GAAP earnings per share of approximately $0.71. This outlook represents a sequential decline from the strong Q4 performance and falls below analyst expectations, leading to investor concern about near-term business prospects.