Main Street Research LLC

Main Street Research LLC is a multi-advisor investment adviser managing approximately $2.38 billion for roughly 920 clients. The firm provides wealth management (financial planning and discretionary investment management) and consulting to individuals, families, foundations, and other institutional clients, including chief investment officer services where appropriate.

MSR runs discretionary portfolios guided by an Investment Committee and combines fundamental, quantitative, and technical analysis to construct portfolios that primarily use individual securities, with ETFs employed selectively for diversification and access to less-liquid markets. The firm applies ESG factor scoring from third‑party research for clients requesting ESG investing and uses risk-management tools such as stop‑loss orders and option overlays for concentrated positions.

What distinguishes MSR from many peers is its acceptance of performance‑based fee arrangements alongside traditional AUM fees — a relative rarity among multi-team firms — structured with tiered performance allocation and a high‑water mark and governed by policies intended to mitigate conflicts of interest. The firm also offers specialized concentrated-stock option strategies managed with a third‑party sub‑advisor and provides next‑generation planning services and digital document organization (LifeCase), features not always found at firms of comparable size.