Washington Harbour Partners

Washington Harbour Partners is an Arlington-based private investment firm backing mission-critical, non-cyclical businesses across cybersecurity, government technology and enterprise technology, with additional activity in defense, space, aerospace, drones, deep tech and energy. It targets U.S. and Five Eyes companies, invests through majority and selected minority positions, and backs companies from Series A through pre-IPO. The firm has acted as a lead or co-lead investor, making it relevant for founders in national-security and hard-tech markets seeking flexible growth capital.