• Equity Capital Markets
  • Mergers & Acquisitions
  • Private Capital Advisory


  • Aerospace & Defense


  • National Defense Industrial Association (NDIA): Board Member, New England
  • The Wings Club: Program Committee, Member


John Stack is Senior Managing Director at B. Riley Securities responsible for Aerospace & Defense (A&D) investment banking. He has 30+ years' global experience working with publicly-traded and privately-held companies. During his career, Mr. Stack has worked across the A&D value chain, helping clients with equity capital markets (ATM, follow on, IPO), mergers & acquisitions and private capital raises. He has been active in defense technology, autonomy / unmanned systems and space. Given his strong industry knowledge, strategic and operational perspectives, vast global network of executives, business owners and investors, and extensive transaction experience, he is a respected and trusted advisor.

Mr. Stack graduated from Bryant University with BS in Finance and Accounting and received an MBA from Fordham University. He is a commercial pilot with instrument and multi-engine ratings. John also holds a Small Unmanned Aircraft System (sUAS) Remote Pilot part 107 license.

B. Riley Securities is a leading middle market investment bank that provides a full suite of corporate finance, advisory, sales and trading and equity research. Investment banking services include initial, secondary and follow-on offerings, institutional private placements, merger and acquisition (M&A) advisory, SPACs, corporate restructuring and recapitalization. B. Riley is nationally recognized and highly ranked for its proprietary equity research.