Don Ritzen is the co-founder and Managing Director of Rockstart. See contact routes.
Don Ritzen is the co-founder and Managing Director of Rockstart, an Amsterdam-based venture capital firm and startup accelerator that has guided over 250 startups to a collective value of €1.7 billion. His investment thesis centers on early-stage companies in sectors including technology, energy, health, and food, with a strong focus on the Dutch and European markets. Through Rockstart’s acceleration program, 50% of participating startups secure investment averaging $350,000 within three months post-program, indicating a strategy that favors rapid follow-on funding rather than large initial checks. While specific check sizes for Ritzen’s direct investments are not publicly detailed, the firm’s accelerator model emphasizes early traction and quick investor engagement. Notable portfolio companies emerging from Rockstart include Eneco-backed energy ventures, though specific named startups beyond the fund partnership are not explicitly listed in available sources. Ritzen has publicly highlighted the efficiency of Rockstart’s model, noting that half of its startups raise capital shortly after acceleration, reflecting a distinctive point of view on speed-to-investmen
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