12 Best-Performing S&P 500 Stocks in the Last 10 Years

9. Quanta Services, Inc. (NYSE:PWR)

Quanta Services, Inc. (NYSE:PWR) ranks among the best-performing S&P 500 stocks in the last 10 years. On February 23, Stifel increased its price target for Quanta Services, Inc. (NYSE:PWR) to $647 from $517, retaining a Buy rating on the company’s shares. The company reported fourth-quarter 2025 results that exceeded expectations, driven by strong performance in the Electric division and completed acquisitions. The deals include Tri-City for internal electric work, Wilson for delivery and distribution, and Billings for helicopter operations.

The company’s midpoint 2026 revenue projection was around $2 billion higher than expected, mostly as a result of the $1.7 billion to $1.9 billion in acquisitions from the fourth quarter. Adjusted EPS estimate for 2026 also beat expectations by $0.62 at the midpoint.

Stifel stated that the increase in organic awards supports an encouraging outlook for 2026, citing increasing trends in load growth fueling utility investment, increasing combined-cycle gas turbine potential, and sustained positive M&A activity.

Quanta Services, Inc. (NYSE:PWR) provides infrastructure solutions to the electric and gas utility, power generation, communications, pipeline, and energy industries.