Quanta Services, Inc. (PWR), headquartered in Houston, Texas, provides infrastructure solutions for the electric and gas utility, renewable energy, communications, and pipeline and energy industries. Valued at $55.6 billion by market cap, the company also installs transportation control and lighting systems and provides specialty electric power and communication services for industrial and commercial customers. Companies worth$10 billion or more are generally described as “large-cap stocks,” and PWR perf ...