Primoris Services Corporation's stock experienced a significant after-hours plunge of 6.42% on Monday, following the release of its fourth quarter and full year 2025 financial results.

The infrastructure services firm reported quarterly results that exceeded analyst expectations, with Q4 revenue of $1.90 billion beating the consensus estimate of $1.82 billion. Adjusted earnings per share also came in at $1.08, surpassing the estimated $0.99. However, the market reaction was negative, potentially driven by concerns highlighted in the company's report.

Despite the top and bottom-line beats, Primoris faced increased costs on certain renewables projects within its Energy segment, which impacted operating income. Additionally, lower storm restoration work contributed to the pressure on results. The company's guidance for 2026 adjusted EPS was set between $5.80 and $6.00, compared to the FactSet estimate of $5.87, placing the midpoint slightly above expectations.