Dinan & Company, LLC | 5,523 followers on LinkedIn. Dinan is an established, middle market investment bank specializing in merger and acquisition and private capital markets advisory services. Serving a diverse range of clients, from private equity groups to Fortune 1000 companies, family-owned businesses, and entrepreneurs, Dinan offers Wall Street-caliber expertise to the thriving middle market. For over 35 years, business owners and investors have relied on Dinan to turn M&A opportunities into results.