Quanta Services Inc (PWR) Stock Up 5.3% but GF Value Says Overva

Quanta Services Inc (PWR) stock rose 5.3% to $722.31 on August 17, 2026, marking a significant year-to-date and past-year increase, but GuruFocus' GF Value estimates it as 53.4% overvalued at $470.94. Despite a strong GF Score of 89/100, driven by high profitability and growth, its valuation score is low, and insiders have sold $137.5 million in shares without any buying activity, suggesting caution for investors due to potential overvaluation risks.