Generac Holdings Inc. (GNRC) is continuing its upward trajectory, with a gain of 30.8% in the past year compared with the S&P 500 composite’s growth of 29.1%. The sub-industry has declined 24.2% over the same time frame. Headquartered in Waukesha, WI, Generac is a leading manufacturer of backup and prime power generation systems for residential and C&I applications, solar and battery storage solutions, advanced power grid software platforms and services, energy management devices and controls, and engine an ...