Middesk is a San Francisco-based company that provides a platform for businesses to verify the legitimacy of other businesses. The company was founded in 2018 by Kyle Mack and Kurt Ruppel. Middesk's platform uses machine learning algorithms to analyze public data and provide insights into a company's legitimacy, such as its legal structure, ownership, and financial health. The company's customers include banks, insurance companies, and other businesses that need to verify the legitimacy of their partners and vendors.