Research & Insights 2026

Latest thinking
from the firm.

A curated collection of research, commentary, and annual letters from Grey River Associates on international tax planning, wealth structuring, and private client advisory.

A Word from Our Founder
Nate Shantz, CFA leads Grey River's Client Advisory and Structuring Practice. He holds a Yale MBA and is based in the firm's Panama City office.
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Latest Articles

Timely research and commentary on the structural, tax, and strategic decisions that shape private wealth.

News & Updates

Strategic Brief

Built For Those Who
Build Across Borders

A comprehensive overview of Grey River's cross-border advisory capabilities — international tax, mobility structuring, asset protection, and wealth management for global founders, executives, and enterprise owners.

In an era where borders blur and capital flows freely, the families and founders who operate across jurisdictions face a unique set of challenges — and opportunities. Grey River Associates was built specifically to serve those who build across borders: high-net-worth individuals, business owners, and enterprise executives navigating the complexities of international tax, residency structuring, asset protection, and wealth management.

Our integrated approach combines deep technical expertise in cross-border tax planning with a holistic understanding of our clients' personal and professional objectives. We don't just advise — we architect solutions that preserve wealth, optimise mobility, and secure legacies across generations and jurisdictions.

International Tax Planning
Mobility Structuring
Asset Protection
Wealth Management
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Correspondence

Annual Letters

Year-end letters from the founding partners on the year's priorities, lessons learned, and the landscape ahead for private clients.

Research

Shantz Asymmetric Mobility

Analysis of mobility trends and tax implications for high-net-worth individuals in complex global structures.

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Research

The Fracturing of the Western Fiscal Contract

A deep dive into global fiscal policy shifts and their impact on traditional wealth management models.

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2025 Letter

Grey River Annual Letter

Research

Panama Residency Programs

Comprehensive memo comparing Panama residency programs with other jurisdictions.

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