The U.S. commercial transportation industry is pushing towards sustainable fleet technologies despite regulatory uncertainty. The 2025 State of Sustainable Fleets Market Brief presented at the ACT Expo in Anaheim highlights the industry's resilience and evolution. The report showcases a shift towards cleaner alternatives like battery-electric and hydrogen fuel cell vehicles, renewable fuels, and natural gas. Although federal funding is facing pauses, over $13.5 billion in state and local funding supports zero-emission vehicle projects. Key statistics include a significant increase in renewable diesel production, renewable natural gas supply, and battery-electric vehicle deliveries. Despite modest growth, hydrogen fuel cell electric vehicle adoption is on the rise. Fleet operators are adapting to new complexities, with a focus on cleaner fuels and efficiency gains. Innovations in infrastructure solutions are crucial for scaling battery-electric operations. Although hydrogen faces challenges, there is a cautious deployment increase. The report emphasizes the industry's long-term commitment to clean fleet transformation and the importance of adapting, innovating, and investing in sustainable solutions.