Japan family wealth and succession: long-lived family firms

What are shinise, and why do they matter for Japan family wealth?

Shinise are Japanese businesses that have operated for at least 100 years, and some for more than 1,000. As of 2020 Japan had more than 33,000 of them, including 3,100 older than 200 years (Wikipedia, Shinise). Many are family firms, so the number shows how often Japanese families have passed a business through many hands.

For a family, the lesson concerns time horizon. A shinise owner plans for the next century instead of the next quarter. The owner measures success by the survival of the firm, the trust of customers and the care of employees, and treats personal wealth as a result of that survival. A family can borrow this view by setting goals for 25 and 50 years.

What does Kongo Gumi teach about family firm succession in Japan?

Kongo Gumi, a temple-building company, was purportedly founded in AD 578 and counts as the world’s oldest documented company. It ran as a family business for over 1,400 years, and a 17th century scroll traces 40 generations (Wikipedia, Kongo Gumi). Sons-in-law often joined the clan and took the family name.

That habit let the firm keep its name and its craft when a generation had no sons. In January 2006 its assets were bought by the Takamatsu Construction Group, and it continues as a subsidiary. The story shows two points that matter for any family: flexible succession can last for centuries, and a change of owner can still preserve the craft.

How does adoption of an heir work in Japanese family firms?

Japan records the household in the family registry, and succession traditionally runs through the household head. Adoption keeps a head in place when there is no suitable heir by blood, or when the biological child prefers another path. A daughter’s husband is often adopted by her family and becomes a mukoyoshi (Wikipedia, Adult adoption in Japan).

Companies such as Suzuki have used this route, and Osamu Suzuki was the fourth adopted son to head the company. The practice shows a priority: the family chooses the person most able to lead, then gives that person the name and the duty. Families outside Japan can apply the same principle through selection criteria, such as skill, commitment and the trust of the staff.

How can a Japanese family separate ownership from management?

Research on family firms describes the three-circles model of family, ownership and management, which separates the roles that people hold (Wikipedia, Family business). A relative can own shares without running the firm, and a professional manager can run the firm without owning shares.

This separation helps Japanese families when no heir wants to lead. The family keeps ownership through a holding company, appoints a manager from inside or outside the family and uses a board to report. Write the rules down: how the manager is chosen, how dividends are set and how disputes are resolved. A clear document protects relationships when emotions run high.

What does a modern succession plan look like for a Japanese family?

A modern plan combines the old principles with documents. List the heirs, the assets and the company. Name the preferred successor and a backup. Decide how the other heirs receive value, through shares, dividends or other assets, so that each one sees a fair outcome. Perceived fairness decides whether heirs accept the plan, even when the shares differ. Planned succession leaves both the founder and the successor more satisfied.

Power shifts gradually over several years, and the willingness of the founder to step down matters most. Set milestones for the handover: attendance at board meetings, signing authority, contact with banks. Review the plan every year and after each change in the family, such as a marriage, a birth or a death. Keep a copy with the family adviser and one with the company secretary.

When does a Japanese family look to Singapore or Hong Kong?

Some Japanese families hold part of their wealth abroad for diversification, for access to funds or because heirs live overseas. Singapore and Hong Kong offer banks, trustees and fund managers who work in English across Asia. The operating firm usually stays in Japan, and Japanese tax and legal rules continue to apply to the family.

A family office can coordinate Japanese advisers with those in the hub, collect reports and keep one record of decisions. Currency exposure matters too, since wealth often spans USD, SGD, HKD and JPY (EQOS Asia private page, 2026). Ask both sets of advisers to confirm each step in writing. A shared calendar of deadlines keeps filings in both countries on time.

How can a Japanese family start planning a succession?

Start with a family tree, a list of assets and a list of roles in the firm. Hold one family meeting to share the goals: continuity of the firm, fairness among heirs and care of employees. Ask each heir what role they want, and record the answers without judgment. Some heirs prefer ownership without management, and some prefer a career outside the firm. Both answers help the plan.

A free 30-minute pre-diagnostic with EQOS Asia helps you place your case (EQOS Asia private page, 2026). This page is general information, not legal, tax or investment advice, as of October 2026. Confirm every legal and tax point with advisers licensed in Japan and in any other country where your family holds assets.

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About the author

Stéphane Jambu

President, EQOS Forecast Asia

Stéphane Jambu leads EQOS Forecast Asia and works as a consultant in e-commerce, search visibility, and AI. LinkedIn profile