📚 Stock Market Glossary

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Joel Greenblatt Magic Formula

Valuation

💡 Key Takeaway: A quantitative investment formula ranking stocks by high return on capital (business quality) and high earnings yield (cheap valuation).

Designer Outlet Clearance Analogy: Like searching for top-tier luxury merchandise (high Return on Capital) and then buying exclusively from the 90% off clearance rack (high Earnings Yield), securing elite quality at rock-bottom prices.

😎 10-Second Show-off Pro Tip for Friends!

☕ Show-off Tip: 'The secret of Greenblatt Magic Formula is using EBIT over EV instead of simple PER. It accounts for corporate debt burdens and gives a much truer picture of acquisition yield.'

📖 Beginner-Friendly Explanation

STEP 1

Core Concept & Meaning

The Magic Formula is a legendary rule-based quantitative value investing system created by Joel Greenblatt, founder of Gotham Capital.

Its core philosophy is simple: buy above-average companies at below-average prices. It ranks a stock universe based on two core factors: Return on Capital (identifying high-quality moats) and Earnings Yield (identifying deeply discounted valuations).

STEP 2

Why It Matters & Mechanism

Factor 1: Return on Capital (EBIT / Tangible Capital Employed): Measures how efficiently a business converts physical capital and working capital into operating profit.
Factor 2: Earnings Yield (EBIT / Enterprise Value): Compares operating profit against total acquisition cost including debt, offering a purer valuation metric than simple PER.
Unified Rank: Sums the two percentile ranks together. A company ranked 5th in ROC and 10th in Earnings Yield earns a combined score of 15.

STEP 3

Practical Investment Tips & Pitfalls

Historical backtests between 1988 and 2004 demonstrated annualized returns exceeding 30.8%. However, individual holdings often face temporary sector headwinds, requiring investors to maintain rigorous multi-year discipline across a 20 to 30 stock diversified basket.

📊 Greenblatt Magic Formula Metrics

Return on Capital (ROC) = EBIT / (Net Working Capital + Net Fixed Assets) Earnings Yield = EBIT / Enterprise Value (EV)

▶ EBIT = Earnings Before Interest and Taxes ▶ EV = Market Capitalization + Net Debt (Total Debt - Cash) ▶ Rank all qualifying stocks on both metrics and invest in the lowest combined score

⚖️ Key Comparison at a Glance

Category	Magic Formula	Simple Low-PER Strategy	Growth Momentum Strategy
Quality Verification	Strictly verified via high ROC	No quality check (risk of buying zombies)	Focuses on revenue growth over profit
Valuation Metric	EBIT / EV (Accounts for debt & cash)	Price / EPS (Vulnerable to leverage bias)	High PSR / Forward multiples
Rebalancing Cycle	Strict annual mechanical rebalancing	Ad-hoc discretionary trades	Frequent stop-loss and trend switching
Historical Backtest	20% to 30% annualized over long runs	Modest outperformance over benchmark	High boom in bull runs, severe drawdowns in bears

⚔️ Don't Mix These Up! (Head-to-Head Comparison)

VSROIC (Return on Invested Capital)

View ROIC→

💡 Crucial Difference: ROIC measures after-tax operational capital efficiency alone, whereas the Magic Formula is an integrated dual-metric ranking strategy combining pretax EBIT returns with acquisition earnings yields.

📌 Practical Market & Real-World Example

A specialized semiconductor equipment supplier generating a 35% Return on Capital that trades at a steep discount with a 15% Earnings Yield represents a classic Magic Formula top holding.