MainCloseMainClose is a purpose-built SaaS platform that guides individual SBA buyers through the entire small-business acquisition journey—from valuation to the first year of ownership. It provides an end-to-end workflow across five integrated phases (DealDesk, DiligenceRoom, CloseKit, TransitionOS, OwnerDash) for valuation, due diligence, closing, transition, and post-close performance. Delivered primarily through brokers, MainClose replaces spreadsheets and generic M&A tools and aims to own the closing phase with a broker-first network and ongoing operating-system capabilities for acquired businesses.