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Private Equity FundPuts its own capital into companiesLAST VERIFIED Oct 2026 · 12 SOURCES

NiXEN Partners

Also known as NiXEN, Nixen Partners SAS, N.I Partners

Paris independent AMF-authorised manager (Natixis Private Equity spin-off) co-investing €1–10M in small and mid-cap LBOs alongside lead funds and running funds of funds for family offices.

HEADQUARTERS
Paris, France
FOUNDED
—
AUM
—
OUTSIDE CAPITAL
Yes
TEAM LISTED
4 people

Focus

STAGES
Buyout
SECTORS
HealthTechConsumer & E-commerceSoftware & SaaSIndustrial & Manufacturing
ASSET MIX
Private equityFunds (as LP)
GEOGRAPHY
FranceEurope

Overview

NiXEN Partners is an independent Paris management company that began investing in 2005 with the NiXEN I vehicle in buyouts and became independent in 2010 through a spin-off from Natixis Private Equity, raising NiXEN II in 2012. Since 2019 it co-invests as a minority alongside lead private equity funds (named examples: Andera Partners, CAPZA, Equistone, Keensight) through a co-investment fund (€1–3M tickets in 10–15 deals) and dedicated single-asset vehicles (€4–10M). Since 2022 it also offers funds of funds, mainly for family offices, with allocations to European and international private equity funds.

Investment thesis

Minority co-investments in majority or minority deals with defined liquidity, in French and European SMEs and mid-caps with enterprise value above €50M, a proven record of profitable growth and potential to consolidate fragmented sectors.

PORTFOLIO (3)

  • Ceva Santé Animale
    HealthTech · since 2025
  • Les Petits Culottés
    Consumer & E-commerce · since 2025
  • Palex
    HealthTech · since 2024

People

  • Priti Agarwal Marteil
    Associé gérant (Managing Partner) · source
  • Sébastien Guillin
    Associé gérant (Managing Partner; joined 2026) · source
  • Jean-Paul Bernardini
    Senior Advisor · source
  • François Baubeau
    Senior Advisor · source

Links

Frequently asked questions

NiXEN Partners is a private equity fund based in Paris, France.

Yes. NiXEN Partners invests its own capital in private companies. It also commits capital to third-party funds as an LP.

NiXEN Partners invests at Buyout stage in HealthTech, Consumer & E-commerce, Software & SaaS and Industrial & Manufacturing.

NiXEN Partners's stated ticket size is €1M–€10M.

Key people at NiXEN Partners include Priti Agarwal Marteil (Associé gérant (Managing Partner)), Sébastien Guillin (Associé gérant (Managing Partner; joined 2026)), Jean-Paul Bernardini (Senior Advisor) and François Baubeau (Senior Advisor).

NiXEN Partners's investments include Ceva Santé Animale, Les Petits Culottés and Palex.

Yes. NiXEN Partners manages capital from outside investors.