Joel Greenblatt

Who he is

Joel Greenblatt (b. 1957) founded Gotham Capital in 1985 with $7 million, much of it from junk-bond king Michael Milken's clients. Over the next decade the fund compounded at roughly 50% per year before fees — one of the best documented runs in investing history — after which he returned all outside capital.

He has taught the value investing course at Columbia Business School since 1996, and his books — "You Can Be a Stock Market Genius" and "The Little Book That Beats the Market" — turned hedge-fund technique into required reading for individual investors.

Core philosophy

Early Greenblatt hunted where institutions structurally could not: spin-offs, restructurings, merger securities, rights offerings — corporate events that create forced, price-insensitive sellers. The edge was not secret information but a willingness to read documents nobody else read.

Later Greenblatt compressed Buffett into arithmetic. The Magic Formula ranks stocks on just two factors — high return on capital (good business) and high earnings yield (cheap price) — and buys a basket of the best-ranked. Its hardest part, he insists, is behavioral: the formula underperforms for stretches, and most people quit at exactly the wrong time.

Famous decisions

His casebook is full of event-driven wins: Marriott's 1993 split, where he bought the debt-laden "Host Marriott" stub everyone else discarded; Sears' spin-off of Allstate; and Wells Fargo LEAPs during the early-1990s real-estate panic. Each followed the same pattern — a structural reason for mispricing, a careful reading of the filings, and a concentrated bet.

Gotham held only six to eight positions for most of its great decade — concentration that, he argues, is safe only when you truly understand what you own.

Key lessons for individual investors

• Look where others are forced to sell — spin-offs and corporate events create bargains mechanically.
• Good business plus cheap price is the whole game; everything else is detail.
• A strategy only works if you can stick with it through the years it does not.
• Reading the actual filings is an edge precisely because almost nobody does it.
• Concentration is for high-conviction, well-understood ideas; diversification is for formulas.

Case deep-dive I: Host Marriott, 1993 — treasure in the discarded stub

In 1993 Marriott split itself in two: "Marriott International", the clean fee-earning hotel manager everyone wanted, and "Host Marriott", a stub saddled with the unsellable hotels and most of the debt. Institutions dumped Host automatically — too small, too leveraged, too ugly for any mandate.

Greenblatt read the spin-off documents that almost nobody else opened, and found three classic signals: insiders were keeping meaningful stakes in the stub; the debt was non-recourse, ring-fenced from the best assets; and the selling was mechanical rather than informed. He bought; the stub roughly tripled within months.

In "You Can Be a Stock Market Genius" he generalized the pattern: in every spin-off, ask who is forced to sell, what insiders are doing, and where the debt actually sits. The ugliness is the camouflage; the documents are the map.

Case deep-dive II: Wells Fargo LEAPs, 1992 — defining the downside first

During the early-1990s California real-estate bust, Wells Fargo traded near $77 amid forecasts of crippling loan losses. Greenblatt judged the franchise — a low-cost deposit machine — likely to survive, but he acknowledged real uncertainty about the loan book. Instead of buying the stock outright, he bought long-dated call options (LEAPs), spending a small, strictly capped premium.

The structure matched the situation: if the bears were right, he would lose only the premium; if the bank merely survived, normalized earnings implied a price far above the strike. Wells Fargo recovered strongly, and the LEAPs multiplied several times over — a far better risk-adjusted outcome than the shares themselves.

The lesson he emphasized was not about options as such, but about engineering asymmetry: first cap what you can lose, then let the upside take care of itself.

Greenblatt's classic playbook, step by step

1. Monitor corporate events — spin-offs, restructurings, rights offerings — where forced selling is built in.
2. Read the original documents: insider incentives and the location of the debt are the two master keys.
3. Prefer the ugly, ignored, too-small piece that mandates cannot hold.
4. Engineer asymmetry into the position itself — cap the loss first, via price or structure.
5. Exit on re-rating and roll forward; when systematizing, diversify the magic-formula way.

Practical takeaways from Greenblatt's casebook

• In corporate events, follow three trails: forced sellers, insider incentives, and where the debt sits.
• Read the actual spin-off and merger documents — the edge is that almost nobody does.
• Structure positions for asymmetry: define the maximum loss before dreaming about the gain.
• Ugly, ignored and small is a feature set, not a bug list.

Track record & famous decisions

In their own words

• "Buying good businesses at bargain prices is the secret to making lots of money."
• "Choosing individual stocks without any idea of what you're looking for is like running through a dynamite factory with a burning match."
• "The strategy works because it does not always work."

Related tools