Quanta Services shares surge 5.79% after-hours as Seaport upgrades stock to Buy and highlights strong earnings outlook.

Quanta Services surged 5.79% in after-hours trading, driven by renewed investor confidence in its data center power infrastructure exposure and expanding grid modernization contracts. Recent reports highlighted the company’s alignment with long-term energy transition trends, including rising demand for transmission infrastructure and electrification projects, which bolstered its valuation narrative. Additionally, Seaport’s recent upgrade of Quanta to "Buy" as a top 2026 power stock further reinforced optimism. The stock’s proximity to its analyst-derived fair value of $477.25, coupled with a robust $72.96 billion market capitalization and a 53.74% total shareholder return over the past year, signaled market alignment with its growth trajectory. Analysts noted that Quanta’s substantial contract backlog and upcoming February 19 earnings release also contributed to the after-hours rally, as investors priced in expectations of sustained revenue and margin expansion amid the AI-driven power infrastructure boom.