Generac Holdings Inc. (GNRC) stock has surged 35.2% in the past six months compared with the S&P 500's growth of 10.6%, respectively. Z SI254M: 39.49 GNRC: 35.2% CMI: 15.05 ENPH: 0.9% AYI: -0.7% 8/24 - ENPHASE ENE Image Source: Zacks Investment Reso However, it has underperformed the sub-industry's rally of 39.4% in the past six months. While peers like Enphase (ENPH) and Cummins (CMI) have gained 0.9% and 15%, Acuity Brands' (AYI) shares have dropped 0.7% in the past six months. GNRC is currently trading a ...