MasTec's stock surged 6.59% in after-hours trading, extending significant gains from the regular session. The infrastructure company's shares experienced a sharp upward movement following the release of its quarterly financial results.

The rally was driven by MasTec's first-quarter 2026 results, which substantially exceeded analyst expectations. The company reported adjusted earnings per share of $1.39, beating the consensus estimate of $0.99 and representing a 174% increase year-over-year. Revenue climbed 34% to $3.83 billion, also surpassing expectations. Strong growth was led by a 91% increase in the Pipeline Infrastructure segment and a 45% increase in the Clean Energy and Infrastructure segment.

Furthermore, MasTec raised its full-year 2026 financial guidance, increasing its revenue forecast to $17.5 billion and its adjusted diluted EPS outlook to $8.79. The company's 18-month backlog grew 28% to $20.3 billion, with Clean Energy and Infrastructure backlog up 65%, providing visibility for future revenue. Improved operational efficiencies across key segments contributed to margin expansion, supporting the positive investor sentiment.