01
Corporate Law
Legal architecture for M&A and global structures.
Explore Strategy
Billions in Assets Under Protection
15B+
Success Rate in Complex Cases
98%
Global Families & Corporations Served
200+
The Boutique
A bespoke approach to complex matters.
Onyx is not just a firm. It is a strategic partner for those who demand absolute discretion and uncompromised technical excellence in every move.
20+Years of Experience
500+High-Value Matters
Excellence as Standard
Our Principles
ART. I
Discretion
Absolute privacy across all spheres of operation.
ART. II
Precision
Every detail analyzed under multiple strategic lenses.
ART. III
Loyalty
Unwavering commitment to client's long-term objectives.
A History of Excellence
Our Heritage
2004
Founded in São Paulo focused on Private Banking.
2012
Expansion to Geneva and London.
2024
Consolidation as the largest independent legal boutique.
Our Expertise
Specialized Practice Areas
02
Wealth Management
Asset protection and high-net-worth succession.
Explore Strategy
03
Tax Strategy
Tax optimization for complex cross-border operations.
Explore Strategy
Senior Partners
The Mind behind the Strategy
Dr. Alexandre Vance
Founding Partner - Corporate Strategy
Dr. Elena Sterling
Head of International Wealth Management
Thought Leadership
Strategic Perspectives
MAR 2026Strategy
The Future of Family Succession in a Digital World
Read Full Article
FEV 2026Wealth
Offshore Structures: Trends for 2026
Read Full Article
Endorsements
What the voices who trust us say
"Onyx's strategic precision changed our view on crisis management. Pure excellence."
CEO, Fortune 500
"Discretion and technical competence. There is no other partner at this level for our family."
Private Investor
Intelligence
Frequently Asked Questions
We use bank-level encryption protocols and rigorous NDAs for all our members.
Confidential
Schedule a Confidential Conference
For high-complexity inquiries or wealth management, use our direct and encrypted channel.