Financial Architecture & Family Wealth
A design firm for corporate financial architecture and family wealth.
Built on multi-jurisdiction legal databases and our proprietary platform Archon™,
we architect the structures that hold enterprises and families together.
Our Philosophy
A collection of tax tricks is not a structure. SEISEI designs the financial architecture itself — spanning tax systems, accounting, law, and technology — for enterprises and founding families. We do not conceal problems; we find them and resolve them structurally. That is our work.
Structure over Technique
Design from the whole structure, not isolated tactics
Evidence over Opinion
Every proposal carries a verifiable legal basis
Continuity over Quick Wins
Structures that function across generations, not one-off effects
Our Practice
Financial Architecture Diagnostics
We map the financial structures of the enterprise, the individual, and the family — identifying risks and opportunities. Every engagement begins with an accurate diagnosis.
Corporate Structuring
Incorporation, holding companies, group reorganization — corporate structures designed for your growth stage and capital policy.
Family Wealth Architecture
Cross-border asset architecture informed by CRS and multi-jurisdiction tax regimes, plus family office formation support.
Succession & Inheritance Structuring
Succession schemes grounded in structural analysis of inheritance tax regimes. Generational transfer as a plan, not an improvisation.
IPO Advisory
Tokyo, Hong Kong, Singapore, China, the U.S. — pre-IPO financial architecture grounded in our five-market listing-rules database.
Retainer Advisory
Long-term stewardship of the structures we design — periodic reviews and structural responses to tax reform.
* Tax return preparation, tax agency, and individual tax consultation are handled by partner licensed tax accountants in accordance with Japan's Certified Tax Accountant Law. SEISEI provides financial and management consulting and general tax-system information.
The Platform
Archon™ is our proprietary multi-jurisdiction wealth management platform. Drawing on statutory databases and structural simulation across jurisdictions, every design proposal is presented with verifiable grounds — anchored in the primary text of the law, not consultant heuristics.
How We Work
Diagnosis
We map your current financial structure, identify issues and opportunities, and produce the diagnostic report that anchors all design work.
Architecture
We deliver an executable structural design — legal grounds, migration steps, and risks all made explicit.
Implementation
We manage execution in concert with licensed partners — tax accountants, judicial scriveners, and other qualified professionals.
Stewardship
As retained advisors we maintain and update the structure, responding to tax reform at the structural level.
The Firm
| Company | 心享勢成株式会社（SEISEI INC.） |
|---|---|
| Representative Director | Man Zhao |
| Founder | Josh Zhang — Financial Structure Advisor |
| Address | Toranomon Towers Office, 1-28-10 Toranomon, Minato-ku, Tokyo 105-0001, Japan |
| Business | Financial architecture consulting (diagnostics & corporate structuring); family wealth design & family office formation; succession & inheritance structuring; IPO advisory; retainer advisory; development of the Archon™ wealth management platform |
| Languages | Japanese / Chinese / English |
| ceo@seisei.tokyo | |
| linkedin.com/in/josh5 |
A financial-architecture team anchored by holders of CPA Australia and FCMA, CGMA designations. Statutory work — tax filings, registrations — is performed by licensed partners, giving clients a single, seamless line from design to execution.
All engagements are conducted under non-disclosure agreements. We never disclose any information to third parties — including the existence of the relationship itself.
Begin with a Conversation
Whatever the scale of your business or assets, start by telling us where you stand. In the first conversation we will advise whether a diagnosis is warranted and how we would proceed.
ceo@seisei.tokyo