Sebastian Ribbentrop, Managing Partner at Join Capital, London, England, United Kingdom — verified investor profile. See sector focus and contact routes.
Sebastian von Ribbentrop is the Managing Partner and founding partner of Join Capital, an early-stage venture firm based in London with over 30 years of private assets experience prior to roles at WestLB AG and Borromin Capital. He invests across various stages and sectors, with a specific thesis focused on industrial vertical software, defense technology, breakthrough components manufacturing, and Industry 4.0 enterprise tech. While specific check sizes and lead/follow behavior are not publicly detailed, he actively serves on boards of early-stage businesses including 2DPhotonics, Optics11, and Opteran. Notable portfolio companies in his diverse investment history include Proxyclick, CloudNC, FINALCAD, and Silico, alongside deep-tech firms like Opteran and 2D Photonics. His distinctive point of view centers on the intersection of geopolitics, defense, and future industrial innovation, a theme he has highlighted at events like DefenseTech Week and the EUVC Summit 2025. Ribbentrop holds degrees in Computer Science and Finance from Humboldt University in Berlin, grounding his technical investment approach.
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