Joel Greenblatt

Joel Greenblatt proved that a systematic, rules-based approach to value investing — finding cheap, profitable businesses — could beat the market and could be taught to ordinary investors through accessible books and online tools.

The Gotham years

Greenblatt founded Gotham Capital in 1983 and ran it for roughly a decade, during which it compounded at roughly 50% per year — extraordinary returns. His approach was to identify undervalued, profitable small-cap companies and concentrate in them.

What set Greenblatt apart was his willingness to be systematic about the process. Rather than relying purely on intuition, he developed criteria: cheap valuations and high returns on capital (ROIC). A company that was both cheap and had high ROIC was statistically likely to perform well. He screened the universe for these companies and concentrated his portfolio in the cheapest, highest-ROIC names.

The Magic Formula

In the early 2000s, after stepping back from active management, Greenblatt published The Little Book That Beats the Market, which presented a simplified version of his approach: rank companies by a “Magic Formula” that combined valuation and quality metrics. The book sold millions of copies and introduced value investing to a mass audience.

The Magic Formula was intentionally simple — rank by ROIC and inverse price-to-earnings — making it accessible to individual investors who couldn’t do deep analysis. The idea was that even unsophisticated investors could identify statistically attractive opportunities by following a mechanical screen.

The teaching mission

Rather than running a hedge fund or trying to manage billions of dollars, Greenblatt chose to focus on teaching. He created websites with free Magic Formula screeners, allowing anyone to identify potential investments. He published multiple books explaining value investing principles.

This approach was unusual. Most successful investors prefer to keep their edge proprietary. Greenblatt instead believed that teaching value investing was important enough to justify sharing his methods.

The systematic investing philosophy

Greenblatt’s core belief is that you don’t need to be a genius to invest well; you need discipline and a systematic approach. The Magic Formula eliminates emotion and picks stocks based on objective criteria. This appeals to investors who distrust their own judgment or who don’t have time for deep research.

The evidence suggests that simple systematic value strategies work reasonably well, though perhaps not as well as Greenblatt’s Gotham results in the early 1990s. The returns are modest — perhaps 12-15% per year with some variation — but they beat the market average.

Gotham Capital’s evolution

While Greenblatt focused on teaching in the 2000s and 2010s, Gotham Capital continued to operate under other managers, managing money for institutions. The firm maintained discipline around value investing and concentrated positions, though Greenblatt was no longer driving day-to-day decisions.

Legacy and influence

Greenblatt proved that value investing principles could be systematized and taught. He demonstrated that you didn’t need insider information or genius-level stock-picking to beat the market; you needed discipline and a focus on cheap, profitable businesses.

His influence is particularly strong among individual investors seeking to apply value principles without extensive training. His books have introduced millions to value investing. His Magic Formula screener has been used by hundreds of thousands of investors.

His approach also legitimized systematic, rules-based investing — the idea that you could codify investment principles into screening rules and then execute mechanically. This anticipated the rise of quantitative investing.

See also