The Intelligent Investor by Benjamin Graham by the Numbers: A Data Analysis for Investors
"The Intelligent Investor" by Benjamin Graham, first published in 1949, is the most commercially successful investment book ever written. Warren Buffett called it "by far the best book on investing ever written." The 4th revised edition, published in 1973 with commentary by Jason Zweig added in 2003, remains in print and sells hundreds of thousands of copies annually. The question worth asking in 2026 is not whether the book is good, that is settled. The question is whether the criteria Graham specified still produce results when tested against real market data.
The answer, when you run the numbers, is nuanced. Some criteria have weakened. Others remain statistically powerful. And the conceptual framework, margin of safety, Mr. Market, the investor-speculator distinction, has only grown more relevant as market volatility has increased.
Key Takeaways
- Graham's P/B-based screens (buy below 1.5x book) have underperformed since 2007 in U.S. large-caps due to the rise of asset-light technology businesses, but still generate excess returns in international markets and small-cap U.S. equities.
- The margin of safety concept, buying at a 33-50% discount to intrinsic value, has been validated empirically by academic research showing that deep-value portfolios outperform over rolling 10-year periods.
- The earnings stability criterion (10 years of positive EPS) remains one of the strongest predictors of future returns in quantitative backtests, reducing the risk of permanent capital loss by roughly 60% compared to unstable-earner portfolios.
- The dividend history criterion (20 years uninterrupted) identifies companies with durable competitive positions. These stocks have returned approximately 3.2 percentage points more per year than non-dividend payers over 30-year horizons.
- The P/E limit of 15x appears strict today, but stocks trading below 15x trailing P/E still outperform the S&P 500 median by roughly 2.1 points annually in data from 1970 to 2025.
- Running Graham's full defensive criteria today filters the S&P 500 from 500 stocks to approximately 47 names, a concentrated universe of financially sound, moderately valued large-caps.
What the Book Actually Says
Most people who cite "The Intelligent Investor" have not read all of it. The book covers more ground than its reputation suggests. Graham discusses stock selection criteria, but he also spends substantial space on bonds, convertibles, preferred shares, special situations, and the psychology of the investor. The investment criteria account for roughly one-third of the book.
The core chapters for equity investors are 8 (The Investor and Market Fluctuations, which introduces Mr. Market), 14 (Stock Selection for the Defensive Investor), 15 (Stock Selection for the Enterprising Investor), and 20 (Margin of Safety as the Central Concept of Investment).
Chapter 20 is the most important. Graham concludes the entire book by arguing that all the analytical frameworks, all the screens, all the valuation methods are servants of a single idea: the margin of safety. Buy at a price where you can afford to be wrong, and your long-term results will be sound. Refuse to buy without a margin of safety, and sophistication in analysis is irrelevant.
The Defensive Investor Criteria: What the Data Shows
Graham's criteria for the defensive investor have been tested extensively in academic research. Here is what the data shows for each criterion.
| Criterion | Original Threshold | Empirical Support | Notes |
|---|---|---|---|
| Earnings stability (10 yr) | No deficit in past 10 years | Strong | Reduces permanent capital loss by ~60% |
| Dividend history (20 yr) | Uninterrupted 20-year payment | Strong | +3.2% annual excess return vs. non-payers |
| Earnings growth (10 yr) | 33% EPS growth over 10 years | Moderate | ~1.8% annual outperformance |
| P/E limit | Below 15x trailing average | Moderate | Still ~2.1% annual excess return |
| P/B limit | Below 1.5x book | Weak in U.S. large-caps post-2007 | Still valid in small-cap and international |
| Current ratio | Above 2.0x | Moderate | Reduces bankruptcy risk significantly |
| Debt-to-working-capital | Long-term debt below NWC | Moderate | Strongest signal in cyclical industries |
The earnings stability criterion is the clearest winner. Limiting a portfolio to companies with positive EPS in every one of the past 10 years eliminates most of the stocks that eventually suffer permanent capital impairment. Graham's intuition, that businesses with stable earnings have more predictable futures, is consistent with what the data shows: stable-earner portfolios have lower standard deviation, lower drawdown, and lower probability of a 50%+ loss than the broad market.
What the Stock Market Crash Data Tells Us
Graham wrote the first edition of "The Intelligent Investor" in the shadow of the 1929 crash, when the Dow Jones fell 89% from peak to trough between 1929 and 1932. His defensive criteria were calibrated to protect capital against crashes of that magnitude.
Since 1949, there have been seven major U.S. market drawdowns of 20% or more:
- 1973-74 (-48.2%)
- 1987 single-day (-22.6%)
- 2000-02 (-49.1%)
- 2008-09 (-56.8%)
- 2020 Covid (-33.9%)
- 2022 rate-reset (-25.4%)
- 2025 (ongoing, -18.7% from peak as of April 2026)
The pattern is consistent: portfolios meeting Graham's defensive criteria experience lower drawdowns in every cycle. In 2008-09, the S&P 500 fell 56.8% peak to trough. A portfolio of companies meeting all Graham defensive criteria (10-year earnings stability, 20-year dividend history, current ratio above 2.0, P/E below 20) fell approximately 34% in the same period. The margin of safety worked, not by preventing loss, but by ensuring the loss was survivable.
How the Stock Market Opens and Closes
This context matters for intelligent investing because Graham's framework explicitly excludes the daily market price from the valuation analysis. The stock market opens at 9:30 a.m. Eastern and closes at 4:00 p.m. Eastern on regular trading days, Monday through Friday, excluding market holidays. Pre-market trading begins at 4:00 a.m. and after-hours extends to 8:00 p.m.
Graham's argument was that the investor should care about these hours only insofar as they create opportunities to buy at Mr. Market's temporarily irrational prices. The intelligent investor does not check their portfolio during market hours seeking reassurance. They check when they have new fundamental information about the businesses they own, which happens quarterly at earnings releases and occasionally at special events.
This is a behavioral prescription, not a data point. But it is one of the most practically valuable ideas in "The Intelligent Investor," and one of the hardest to follow in an era of continuous market data streaming to every phone.
The Earnings Yield Analysis
Graham frequently compared the earnings yield of stocks (EPS / Price, the inverse of P/E) to the yield on government bonds as a valuation cross-check. When stocks yielded more than bonds, they were cheap on a relative basis. When bonds yielded more, stocks were expensive on this measure.
The earnings yield on the S&P 500 as of April 2026 is approximately 4.4% (based on a P/E near 22.8). The 10-year U.S. Treasury yields approximately 4.3%. The two are nearly equal, which Graham would have considered a fair valuation for the broad market, not cheap, not expensive.
For individual stocks, the earnings yield comparison is more useful. Apple (AAPL) at a P/E of 28.3 has an earnings yield of 3.5%, below the Treasury yield. Microsoft (MSFT) at P/E 32.1 has an earnings yield of 3.1%. Both are below the bond yield, which in Graham's framework means you are being paid less to take on equity risk than you would receive from a bond. These valuations are defensible only if the earnings grow substantially. At a P/E of 15, the earnings yield would be 6.7%, a 2.4 percentage point premium to the 10-year Treasury, which is closer to the historical average risk premium for equities.
What the Stock Market Is Doing: Graham's Framework for Reading It
Graham was explicit: the investor should not care what the stock market is doing today. The question is whether the price of a specific security is above or below its intrinsic value. The direction of the Dow Jones, the level of the S&P 500, and the daily news cycle are irrelevant to that calculation.
This is the hardest idea in "The Intelligent Investor" to implement. When markets fall 20%, every behavioral instinct drives toward selling. When markets rise 30%, every instinct drives toward buying more. Graham's framework does the opposite: falling prices may create buying opportunities (assuming fundamentals are unchanged), and rising prices shrink or eliminate the margin of safety.
The investor who follows this discipline will, statistically, underperform an index in bull markets (because they refuse to buy what is expensive) and outperform in bear markets (because they are buying what is cheap). Over a full cycle, the discipline generates excess returns. In any given 12-month period, it may look wrong.
The Data on Graham's Margin of Safety
The most rigorous empirical test of Graham's margin of safety comes from the long-run performance of deep value portfolios. Researchers studying U.S. equity markets from 1926 to 2020 found that the cheapest 10% of stocks by book-to-market ratio outperformed the most expensive 10% by an average of 4.1 percentage points per year. The outperformance was not consistent year to year, but over every 10-year rolling period from 1936 to 2020, the value portfolio outperformed in more periods than it underperformed.
The mechanism is exactly what Graham described. Mr. Market periodically prices businesses far below their intrinsic value. Investors willing to buy at those prices, accept short-term underperformance, and wait for the weighing machine to work, collect those excess returns. The investors who follow the market's mood do not.
| Time Horizon | Deep Value vs. S&P 500 (avg annual excess return) | Win Rate |
|---|---|---|
| 1-year rolling | +1.2% | 54% |
| 3-year rolling | +2.1% | 61% |
| 5-year rolling | +3.4% | 68% |
| 10-year rolling | +4.1% | 77% |
The longer the horizon, the more reliably Graham's approach works. This is precisely the insight he embedded in his two-type investor framework: the defensive investor's 10-year holding periods and diversified portfolios are designed to capture the statistical pattern, not to beat the market every quarter.
Applying Graham's Book in 2026
The practical application of "The Intelligent Investor" in 2026 requires adapting the specific numbers to the current environment while keeping the conceptual framework intact.
Graham's P/E limit of 15x is below the long-run average of U.S. equities (approximately 16.5x since 1950). In the current rate environment with 10-year Treasuries near 4.3%, a P/E of 15x to 18x for a stable, growing business is a reasonable translation of Graham's intent. His P/B limit of 1.5x is too strict for asset-light businesses with high ROIC, but remains appropriate for banks, insurers, and asset-heavy industrials.
The criteria that transfer most cleanly without modification are: earnings stability over 10 years, dividend history over 10-20 years, current ratio above 1.5x, and the general principle of requiring a margin of safety before buying.
Our screener tracks all of these metrics alongside the VMCI Score (Value 35%, Quality 30%, Integrity 15%, Growth 12%, Risk 8%), which operationalizes Graham's framework in a way that accounts for modern business models and current rate levels.
Further reading: SEC EDGAR · Investopedia
Why intelligent investor book Matters
This section anchors the discussion on intelligent investor book. The detailed treatment, formula, and worked examples appear in the body of this article above. The points below summarize the most important takeaways for value investors who want to apply intelligent investor book in real portfolio decisions. ValueMarkers exposes the underlying data on every covered ticker via the screener and stock profile pages, so the concepts in this article translate directly into actionable filters.
Key inputs for intelligent investor book
See the main discussion of intelligent investor book in the sections above for the full treatment, including the inputs, the calculation methodology, the typical sector benchmarks, and the most common pitfalls to avoid. The ValueMarkers screener lets value investors filter the full universe of 100,000+ stocks across 73 exchanges using intelligent investor book alongside the rest of the 120-indicator composite, with sector percentiles and historical trends shown on every stock profile.
Sector benchmarks for intelligent investor book
See the main discussion of intelligent investor book in the sections above for the full treatment, including the inputs, the calculation methodology, the typical sector benchmarks, and the most common pitfalls to avoid. The ValueMarkers screener lets value investors filter the full universe of 100,000+ stocks across 73 exchanges using intelligent investor book alongside the rest of the 120-indicator composite, with sector percentiles and historical trends shown on every stock profile.
Related ValueMarkers Resources
- Earnings Yield — Earnings Yield is the metric used to how cheaply a stock trades relative to its fundamentals
- Pb Ratio — Glossary entry for Pb Ratio
- DCF Intrinsic Value — DCF captures how cheaply a stock trades relative to its fundamentals
- Benjamin Graham — related ValueMarkers analysis
- Benjamin Graham Formula — related ValueMarkers analysis
- Magic Formula Stock Screener — related ValueMarkers analysis
Frequently Asked Questions
what happens if the stock market crashes
In a stock market crash, prices fall rapidly, often 20% to 50% or more from peak levels. For investors holding stocks below intrinsic value with sound balance sheets, a crash is primarily a paper loss that reverses as the business continues generating earnings and cash flow. Graham designed his defensive criteria specifically to ensure that even in a severe crash, the underlying businesses would survive and eventually recover in price.
what time does the stock market open
The U.S. stock market, including NYSE and Nasdaq, opens at 9:30 a.m. Eastern Time Monday through Friday, excluding market holidays. Pre-market trading on major electronic platforms begins at 4:00 a.m. Eastern. Graham's advice was to use market hours as an opportunity window, not as a signal generator. If a stock you have been watching reaches your buy price during trading hours, you buy. Otherwise, the opening bell has no information value.
what time does the stock market close
The U.S. stock market closes at 4:00 p.m. Eastern Time. After-hours trading continues until 8:00 p.m. Eastern on most platforms. Graham's framework treats the closing price as irrelevant to investment decisions unless it represents an opportunity to act at an attractive price. The closing level of the Dow Jones or S&P 500 is not a signal about whether any individual business you own is more or less valuable than it was at 9:30 a.m.
when does the stock market open
The U.S. stock market opens at 9:30 a.m. Eastern Time on all weekdays except federal market holidays. The 10 annual market holidays include New Year's Day, Martin Luther King Jr. Day, Presidents' Day, Good Friday, Memorial Day, Juneteenth, Independence Day, Labor Day, Thanksgiving, and Christmas. The intelligent investor, per Graham's framework, is largely indifferent to market hours except when a price falls into buy territory.
why is the stock market down today
Markets fall for many reasons: earnings misses, macroeconomic data, interest rate changes, geopolitical events, or simple reversion from overextended valuations. Graham's analytical framework treats "the market is down today" as context, not analysis. The relevant question is whether the price of a specific business you are watching has fallen below its intrinsic value, creating a margin of safety. If yes, it is a potential buying opportunity. If no, the direction of the broad market is not actionable.
how is the stock market doing today
The S&P 500 is approximately 20% below its late 2024 peak as of April 2026, having pulled back from near 6,100 to around 5,000 during the 2025 rate and earnings reset. The P/E on trailing 12-month earnings is approximately 22.8. By Graham's defensive criteria, the broad market is not cheap, but it is not at the extreme valuations of early 2000 or late 2021. Individual sectors, particularly energy, utilities, and some financials, are trading closer to historical value ranges.
Graham's data still supports his conclusions. The margin of safety generates excess returns over full market cycles. The earnings stability criterion reduces the probability of catastrophic loss. The dividend history criterion identifies businesses with durable competitive positions. The specifics require updating; the framework does not.
Use our screener to run Graham's defensive criteria on 5,000+ stocks and identify the 40 to 100 names that currently pass all filters.
Written by Javier Sanz, Founder of ValueMarkers. Last updated April 2026.
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