Shares surged 19.4% after Generac's Q1 results topped expectations, driven by a 28% jump in Commercial & Industrial segment sales, marked operating leverage, and an upbeat full-year outlook. Management raised guidance on the back of accelerating demand from data center customers and expanded backlog, outpacing prior commentary.

• Net sales grew 12% year-over-year in Q1, led by Commercial & Industrial segment sales up 28%, with data center demand and the Allmand acquisition as drivers.
• Adjusted EBITDA margin reached 18.3%, up significantly from the prior year and described by management as ahead of internal expectations due to favorable mix and cost control.
• Full-year net sales and adjusted EBITDA margin guidance were raised, citing increased data center activity, a larger backlog (> $700 million, up $300 million quarter-on-quarter), and contributions from the Enercon acquisition.
• Additional capacity investment in both manufacturing (new Sussex, WI facility on track for H2 production) and integration of Enercon expected to address bottlenecks and further improve margins.
• Domestic telecom and rental segments also outperformed prior expectations, contributing positively to the outlook for 2026.