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Single Family OfficePuts its own capital into companiesLAST VERIFIED Oct 2026 · 2 SOURCES

Family-owned Finnish investment company in Sastamala investing in operating businesses, industrial holdings and real estate development; also runs its own hospitality and culture venues.

USEFUL FOR Co-investors

Family & background

HEADQUARTERS
Sastamala, Finland
FOUNDED
2012
OUTSIDE CAPITAL
No — own capital only

Investment approach

GEOGRAPHY
Finland
ROUTES
Companies (own capital)
STRATEGIES
Direct investmentsReal estate

Overview

Partnos Oy is a family-owned Finnish investment company based in Sastamala, with roots going back more than 50 years. It invests in active businesses, industrial holdings and real estate development. Through its own businesses it runs culture and hospitality venues in Sastamala, including Tyrvään Pappila, Funkkistalo, Mattilan Majatalo, Kärppälän Ratsutila, the Tyrvää Jazz festival and Art Pappila exhibitions.

Investment thesis

Long-term activity driven by profitable growth and value creation, developing its investment activity on a sustainable and responsible basis.

People

  • Satu Herrainsilta
    CEO · source
  • Jarmo Nieminen
    Owner · source
  • Kirsi-Marja Nieminen
    Owner · source

Frequently asked questions

Partnos is a single family office based in Sastamala, Finland, founded in 2012.

Partnos invests its own capital into companies. Its stated asset mix includes direct investments and real estate.

Partnos invests in Industrial & Manufacturing and Real Estate & PropTech.

Key people at Partnos include Satu Herrainsilta (CEO), Jarmo Nieminen (Owner) and Kirsi-Marja Nieminen (Owner).

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