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Single Family OfficePuts its own capital into companiesLAST VERIFIED Oct 2026 · 3 SOURCES

Founder-led Dutch single family office of Stijn Koster (i3D.net founder) investing only its own capital, mainly as LP in Dutch lower-mid-market private equity funds.

USEFUL FOR Fund managers raising capital · Business owners seeking a long-term partner · Co-investors

Family & background

HEADQUARTERS
Capelle aan den IJssel, Netherlands
FOUNDED
2008
OUTSIDE CAPITAL
No — own capital only

Investment approach

GEOGRAPHY
Netherlands
STAGES
Buyout
ROUTES
Companies (own capital) · Funds (as LP)
STRATEGIES
Funds (as LP)Private equityVenture capitalHedge fundsReal estateDirect investments
INBOUND
Accepts submissions

Overview

Maest is a single family office in Capelle aan den IJssel that invests solely its own capital, without leverage, across private markets, real estate and public markets; it was previously structured as a holding company. Its founder Stijn Koster founded i3D.net and Smartdc datacenters and is now chairman of the i3D.net supervisory board. The site reports positions in 61 private equity funds, 10 venture capital, deep tech and blockchain funds and 3 direct investments, and says it sometimes sits on fund advisory committees. The legal entity Maest Capital B.V. was registered in 2008.

Investment thesis

Focus on direct allocations to Netherlands-based lower middle market funds: lower-mid-market PE buyout funds, LP-led secondaries in top-quartile PE funds, multi-asset co-investment funds and commercial real estate, favouring capacity-constrained opportunities and managers with repeatable strategies.

People

Frequently asked questions

Maest is a single family office based in Capelle aan den IJssel, the Netherlands, founded in 2008.

Maest invests its own capital into companies and in third-party funds as an LP. Its stated asset mix includes funds (as lp), private equity, venture capital, hedge funds, real estate and direct investments.

Maest invests at Buyout stage in Real Estate & PropTech, Deep Tech and Crypto & Web3.

Key people at Maest include Stijn Koster (Founder).

Maest states that it accepts submissions through its official contact page.

No. Maest invests its own capital and does not raise money from outside investors.