Mad River Investors

Mad River Investors

Founded in 1999 and headquartered in Boston, Mad River Investors operates as a registered investment adviser providing discretionary and non-discretionary portfolio management. The firm serves individuals, high-net-worth families, pooled investment vehicles, corporations, and businesses, offering bespoke investment management services across a client base that leans toward concentrated, relationship-driven accounts. The firm constructs portfolios spanning public equities, fixed income, and pooled alternative vehicles, with an emphasis on discretionary mandates that give Mad River authority to execute on behalf of clients. Its regulatory filings indicate the firm can manage separate accounts and participate in fund structures, suggesting a flexible architecture that accommodates both direct securities selection and manager allocation. The geographic focus is primarily domestic, with Boston serving as the sole office and investment hub. Mad River Investors maintains a lean operational footprint consistent with a boutique advisory model. The firm does not publicly disclose assets under management, headcount, or named investment principals, placing it among the quieter practitioners in the Boston wealth-management ecosystem. No affiliated philanthropic vehicles, club memberships, or adjacent operating businesses have been identified in public records. What distinguishes Mad River structurally is its posture as a multi-client RIA without a retail or mass-affluent tilt — the firm's ADV filings list high-net-worth individuals and pooled vehicles as primary client types, a mix more commonly associated with family offices than standard wealth managers. This hybrid identity, combined with a deliberate absence of marketing or public commentary, positions the firm as a discretion-first allocator for a limited number of relationships.