Horizon Technology Finance Corporation Common Stock. Replay the stock market charts of HRZN day by day, back to 2003. Open long and short positions without spending any money. Horizon Technology Finance Corporation is a business development company specializing in lending and and investing in development-stage investments. It focuses on making secured debt and venture lending investments to venture capital backed companies in the technology, life science, healthcare information and services, and cleantech industries. It seeks to invest in companies in the United States.