Impax Environmental Markets PLC is an investment trust company that is engaged in portfolio management. The company's investment objective is to enable investors to benefit from growth in the markets for cleaner or more efficient delivery of basic services of energy, water, and waste. It invests in quoted companies that provide, utilize, implement, or advise upon technology-based systems, products, or services in environmental markets, particularly those of alternative energy and energy efficiency, water treatment and pollution control, and waste technology and resource management.