FONS Family Office Network Service SA

Overview

FONS Family Office Network Service SA is a Swiss family office founded in Geneva in 2003 to connect Switzerland and Japan. The firm now serves clients in Switzerland, Japan, and internationally.

FONS works with prominent entrepreneurs and wealthy private individuals, creating customized family-wealth structures and coordinating support across inheritance, taxation, real estate, banking, art, and education.

History

FONS was established in Geneva in 2003 with a focus on connecting Swiss and Japanese clients and networks. Its founders are Dominique Baignères and Olivier Brunisholz.

Leadership

Dominique Baignères is identified as a founder, independent adviser, and business introducer. Olivier Brunisholz is a founder and Geneva lawyer specializing in international business and taxation.

The website also identifies Ignacio García and Guillaume Lejoindre as independent advisers. García has worked with FONS since 2010, while Lejoindre joined as an independent adviser in 2017.

Services

FONS describes its work as advice and oversight for wealth structuring, wealth management, and succession planning. Its advisory work includes financial, artistic, and real-estate wealth, together with tax and financial organization.

The firm provides account aggregation and consolidated wealth views by collecting and analyzing bank results, transactions, and related data. Its control services include reviewing accounts, transactions, results, balance sheets, and broader wealth, with reporting that helps clients assess provider performance and track assets.

FONS offers guidance on purchases, investments, wealth structuring, family governance, relocation to Switzerland, and related administrative steps. It also supports second and third generations through training and supervision intended to prepare successors for leadership and wealth transmission.

What the firm offers

• Tax planning
• Estate planning
• Family governance and education
• Administration and bill pay
• Private and alternative investments
• Cross-border planning

Client Focus

FONS serves prominent entrepreneurs and wealthy private individuals in Switzerland, Japan, and internationally. Its work is designed for families seeking coordinated oversight across financial, real-estate, artistic, tax, banking, educational, and succession matters.

The firm describes a network that includes private banks, insurers and brokers, real-estate agencies, lawyers, tax specialists, accountants, art galleries and dealers, relocation companies, reporting firms, and fiduciaries.

Approach

FONS says it works independently for the client’s benefit and avoids conflicts with service providers such as banks. It also states that asset data is consolidated in the client’s name.

Fees are proposed case by case after reviewing a client’s situation and needs, with pricing based on complexity, services, and the expertise required.

FAQs

Related resources

• LocationMultifamily offices in Geneva

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• Network siteOffshoreTrusts.com

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  FamilyBusinesses.com provides a directory and practical playbooks for family-owned companies. A business-owning family can use it to consider governance, education, succession, liquidity, and communication needs that may connect with FONS's family governance, estate planning, and private investment services.

• GuideOutsourced CIO vs multifamily office

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Sources

1. FONS, “Qui sommes-nous?”
2. FONS homepage
3. FONS, “Que faisons-nous?”
4. FONS, “Informations pratiques”

Claim or correct this profile

This profile is a factual summary written in our own words from public sources. It is for information only. It is not an endorsement, rating, ranking or recommendation, and it is not investment advice. MultiFamilyOffices.com is not affiliated with the SEC or with this firm unless stated. Form ADV figures are self-reported by the firm.