# Maest

Maest is a Single Family Office based in Capelle Aan Den IJssel, Netherlands.

## Overview

- **Organization type:** Single Family Office
- **Headquarters:** Capelle Aan Den IJssel, Netherlands
- **Region:** Europe
- **Address:** Capelle Aan Den IJssel, Netherlands
- **Founded:** 2008
- **Assets under management:** Undisclosed
- **Website:** maest.nl
- **LinkedIn:** https://nl.linkedin.com/company/maestcapital

## Regulatory record

- **Reports private funds:** No

## About

Stijn Koster established Maest as the single family office that succeeded his operating companies. Koster founded i3D.net and Smartdc datacenters, scaled them to 100 million EUR ARR, completed six acquisitions and three exits to listed buyers, then moved to chairman and investment roles. The firm maintains a multi-generational mandate focused on capital preservation and continuity for the family. Maest allocates across private equity buyout funds, venture capital and deep tech funds, hedge funds, direct co-investments, LP-led secondaries and commercial real estate. It targets lower middle market private equity funds structured for participation exemption and multi-asset co-investment vehicles. Confirmed positions include Netherlands-based lower middle market funds and global venture allocations in AI/ML, cybersecurity and blockchain. The firm operates in Europe with additional exposure across North America, Asia, Africa, the Middle East and South America. It maintains a concentrated portfolio and adds only a limited number of new managers each year. No external capital or leverage is used. The team consists of Koster as founder and principal together with business partners Bo van der Putten and Jan Niessen from De Drie Mollen. Maest also runs a mixed-use real estate portfolio in the Netherlands and maintains philanthropic allocations to regional foundations and sports sponsorships. In the last 24 months the firm continued its pattern of selective private market commitments without disclosed leadership or structural changes. Maest's architecture differs from typical single family offices through its direct operating-company heritage. Koster's 29 high-growth awards and repeated exits created internal capital that now supports both fund commitments and board-level involvement in portfolio vehicles, allowing the office to act simultaneously as LP and governance participant without external fundraising cycles.

## Sectors

- FinTech
- Data Analytics
- Gaming
- PropTech
- AgriTech & FoodTech
- Healthcare Services
- Supply Chain & Logistics
- ClimateTech
- EdTech
- Energy Transition & Renewables
- Industrial Tech
- Mobility & Transportation
- Robotics & Automation
- AI/ML
- Cybersecurity
- Enterprise Software
- Web3 & Blockchain

## People

- Stijn Koster — Founder

## Questions

### Who runs investment decisions at Maest?

Stijn Koster serves as founder and principal. Business partners Bo van der Putten and Jan Niessen support deal flow and governance from their roles at De Drie Mollen.

### How does Maest source proprietary deal flow?

Access stems from Koster's long-standing relationships built during two decades operating i3D.net and Smartdc. The firm adds only a limited number of new managers annually and prefers capacity-constrained vehicles.

### Does Maest participate in fund commitments or only direct deals?

Maest commits to lower middle market private equity buyout funds, venture capital funds and LP-led secondaries. It also executes direct co-investments and holds commercial real estate assets.

### What investment stages does Maest typically target?

The firm covers buyout, growth, majority, middle market, seed and venture capital stages through both fund commitments and direct allocations.

### Does Maest maintain philanthropic structures, and how are they separated?

Maest allocates annually to charitable foundations, local schools, municipalities and sports sponsorships. These activities sit alongside but separate from the investment portfolio.

### What is Maest's known posture on co-investments alongside external GPs?

In select funds Maest takes advisory committee seats or acts as delegated board member. It favors alignment, transparency and governance in multi-asset co-investment vehicles.

## Related profiles

- [M&A Capital](https://altss.com/profile/m-a-capital)
- [Magellan](https://altss.com/profile/magellan)

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Last updated: 2026-08-10T15:54:10.904Z

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