Master Profile
Pat Dorsey's investment career, philosophy, and public 13F holdings through Dorsey Asset Management.
Pat Dorsey’s educational background laid a solid analytical foundation. He earned a Bachelor’s degree in Government from Wesleyan University and later a Master’s degree in Political Science from Northwestern University. He is also a Chartered Financial Analyst (CFA). This academic training cultivated his rigorous research skills.
Dorsey’s investment career is extensive and can be divided into three main stages: Morningstar (2000–2011): As Director of Equity Research at Morningstar, he led the team’s expansion from 10 to over 100 analysts. One of his most significant contributions was developing Morningstar’s “Economic Moat” rating framework, which provided a methodology for systematically analyzing competitive advantages. Sanibel Captiva Trust (2011–2013): After leaving Morningstar, he served as Director of Research at this trust company, managing approximately $1 billion in assets for high-net-worth clients. Dorsey Asset Management (2013–present): In 2013, Dorsey founded Dorsey Asset Management. The firm employs a highly concentrated investment strategy, typically holding only 10–15 global high-quality companies with enduring competitive advantages, strong reinvestment capabilities, and excellent management. It manages assets primarily for long-term institutional investors such as endowments, foundations, and family offices.
At the core of Pat Dorsey’s investment philosophy is deep fundamental research, focused on identifying and investing in companies with strong and sustainable “economic moats.” His key principles can be summarized as follows: Economic moat as the centerpiece: He systematically categorizes moats into four types: Intangible assets: such as brands (conferring pricing power), patents, and government licenses. Switching costs: the high costs customers incur to change suppliers. Network effects: the platform effect where the value of a product or service increases as more users join. Cost advantages: low-cost structures arising from scale, processes, etc. He emphasizes that a true moat is structural and sustainable, not a fleeting hot product or excellent management. The effectiveness of a moat is reflected in the ability to sustain high returns on invested capital (ROIC) over the long term. Moat and reinvestment capability go hand in hand: He believes a moat’s value is maximized when the company can reinvest its cash flows at high rates of return, thereby driving compounding growth in value. High concentration: He adheres to concentrated investments in a small number (10–15) of deeply researched, high-quality businesses. Margin of safety: Even for great companies, he stresses buying at attractive prices—i.e., with a margin of safety. After reflecting on a mistake caused by overly optimistic valuation, he set a personal return hurdle of 15%. Avoiding common pitfalls: In his book “The Five Rules for Successful Stock Investing,” he summarizes frequent investor mistakes such as ignoring valuation, relying on earnings data rather than cash flow analysis, and attempting to time the market, cautioning investors to steer clear of these traps.
Pat Dorsey maintains a relatively low profile in his personal life. Publicly known details include a passion for fly fishing; he has even written books on the subject. He also advocates honestly confronting mistakes and learning from them—a mindset reportedly influenced by Buffett—and each year reviews his own investment errors to remain humble.
Two investment books by Dorsey are regarded as classics for learning value investing, especially the “economic moat” theory: “The Five Rules for Successful Stock Investing” (originally published in Chinese as 《股市真规则》): The book details five principles for successful investing and seven mistakes to avoid, while providing a practical framework for analyzing competitive advantages and financial statements. “The Little Book That Builds Wealth” (originally published in Chinese as 《巴菲特的护城河》): This book focuses more deeply on the concept of economic moats, their sources, how to identify them, and how they evolve over time.