Stijn Koster is the founder of Maest, a Rotterdam-area single family office that says it invests only its own capital and manages. See contact routes.
Stijn Koster is the founder of Maest, a Rotterdam-area single family office that says it invests only its own capital and manages allocations across multiple asset classes. Publicly available material describes Maest as active in private equity, venture capital, commercial real estate, hedge funds, and public markets, with a stated emphasis on private markets and lower mid-market PE funds. Maest’s profile also says it looks at Netherlands-based offerings such as lower mid-market LBO funds and LP-led secondaries, and in select funds may take an LPAC, investment committee, or board role. No reliable public source found a standard check size or clear lead-versus-follow pattern. Named portfolio or allocation references in public sources are sparse, but Maest mentions commercial real estate investments and private-market fund allocations rather than a disclosed operating-company portfolio. Koster’s public writing on LinkedIn emphasizes direct private-market allocations and the appeal of managers transforming and growing lower mid-market companies through add-on acquisitions. He is also publicly described as a Dutch technology entrepreneur who founded i3D
Details on this investor come from filing and round data held in the StartupFundraising directory, refreshed on ingest. Founders use profiles like this one to qualify fit and to shortlist investors in Rotterdam.
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