Impax Environmental Markets plc is a United Kingdom-based closed-end investment trust that enables investors to benefit from growth in environmental markets by investing predominantly in quoted companies providing, utilizing, implementing or advising on technology-based systems, products or services addressing resource efficiency and environmental risks. Founded in 2002 and headquartered at 30 Panton Street, London, the company targets six proprietary sectors including Energy, Clean and Efficient Transport, Water, Circular Economy, Smart Environment, and Sustainable Food; investments focus on small- and medium-cap firms deriving at least 50% of revenues from these areas, with allocations across industrials (approximately 44%), technology (25%), utilities (10%), and others serving global markets in developed and emerging economies. Managed by Impax Asset Management (AIFM) Limited, it emphasizes bottom-up research, active engagement, and sustainability integration, holding the FCA Sustainability Impact label while prioritizing long-term financial returns through a diversified portfolio of innovative, profitable companies in alternative energy, energy efficiency, water infrastructure, waste management, pollution control, sustainable agriculture, and resource efficiency. Recent developments include portfolio management team enhancements with Sanjeev Lakhani joining as co-manager alongside Fotis Chatzimichalakis, ongoing share buybacks such as the purchase of 148,747 ordinary shares at 411.42p in late 2025, major shareholder notifications like Saba Capital increasing its stake to 14.27% and Jefferies Financial Group adjusting holdings, alongside monthly performance updates and webinars discussing portfolio positioning amid market volatility as of October 2025.