David Zimmer is the Founder and Managing Director of Kalodion GmbH. See sector focus and contact routes.
David Zimmer is the Founder and Managing Director of Kalodion GmbH, a Berlin-based single-family office he established in 2019 after selling his telecommunications firm Inexio to EQT for approximately €1 billion. The firm invests patient growth capital with a sustainability focus across early-stage technology startups in Europe and North America, as well as in private equity co-investments and German real estate. While specific check sizes and lead/follow behavior are not publicly detailed, Kalodion has executed direct early-stage deals including a $7.6 million Series A extension in TolerogenixX. Notable portfolio companies include TolerogenixX and the online funeral home mymoria, into which Zimmer personally invested. Zimmer distinguishes himself by avoiding trend-chasing, instead carefully analyzing business models for substance and sustainability after experiencing two boom-and-bust cycles. He is also an author and industrial advisor who favors clear, open communication over diplomatic effort.
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