Joel Greenblatt
Gotham Capital founder who quantified value investing with the Magic Formula, Columbia Business School professor
Joel Greenblatt is the founder of Gotham Capital, which generated annualized returns of approximately 40% over 20 years, making him one of the most successful quantitative value investors in modern history. His best-known contribution is the 'Magic Formula'—a quantitative stock-selection framework combining return on capital and earnings yield—summarized in his 2005 bestseller 'The Little Book That Beats the Market.' He is also a professor at Columbia Business School and founded a non-profit educational initiative to democratize value investing principles.
Methodologies
- Magic Formula Implementation Checklist - Rank the entire market by return on capital and earnings yield; buy the top 30 stocks; rebalance annually; no market timing, no sector selection, purely mechanical execution.
- Special Situations Investment Identification Framework - Systematically scan for corporate spin-offs, bankruptcy restructurings, and merger arbitrage events; identify mispricing opportunities where institutions are structurally forced to sell and individual investors can step in.
Key decisions and timeline
- 1985 Founded Gotham Capital with $7 Million - Finding structurally advantaged niches is more important than competing on information in the crowded mainstream market.
- 1997 Published 'You Can Be a Stock Market Genius', Systematizing Special Situations Investing - Publicly sharing a genuinely systematic investment framework often builds more lasting industry influence than keeping it secret.
- 2000 Began Teaching Value Investing at Columbia Business School - Combining practical wisdom with academic platforms creates a knowledge diffusion effect that transcends direct personal investing impact.
Beliefs and mental models
- Belief 1 - Greenblatt believes truly repeatable alpha comes from systematically identifying two characteristics: high return on capital (indicating business quality) and high earnings yield (indicating cheap price). The Magic Formula quantifies and combines these two dimensions to make them actionable for all investors.
- Belief 2 - Special situations such as spin-offs, restructurings, and merger arbitrage are often ignored by institutional investors for structural reasons (forced selling, size constraints), allowing individual investors to buy assets at significant discounts in these areas.
- Belief 3 - Greenblatt believes most investors (including professionals) cannot maintain long-term discipline in the face of behavioral biases, so a mechanically executed simple system often achieves more consistent alpha than a complex approach relying on case-by-case judgment.
- Model 1
- Model 2
- Model 3