Portman Ridge Finance Corporation is a publicly traded, externally managed investment company that has elected to be regulated as a business development company under the Investment Company Act of 1940. Portman Ridge's middle market investment business originates, structures, finances and manages a portfolio of term loans, mezzanine investments and selected equity securities in middle market companies. Portman Ridge's investment activities are managed by its investment adviser, Sierra Crest Investment Management LLC, an affiliate of BC Partners Advisors, LP.