River UK Micro Cap Limited is an investment company that focuses on long-term capital growth through a diversified portfolio of UK micro-cap companies. It aims to capitalize on the illiquidity risk premium associated with these investments. The trust operates under the management of Carne Global AIFM Solutions, with portfolio management delegated to River and Mercantile Asset Management, which specializes in active equity strategies. Its investment mandate aligns it with other trusts in the UK Smaller Companies sector.