Yes, “The Intelligent Investor” is still relevant, but not in the way most people expect. The book’s specific stock-picking formulas and valuation screens are largely outdated for today’s market. Its lasting value lies in the behavioral and philosophical framework it builds around investing: how to think about risk, how to handle market swings, and how to protect yourself from your own worst impulses. Warren Buffett, who first read the book in 1950, still calls it “by far the best book about investing ever written.”
What Still Holds Up
Graham’s core principles have aged remarkably well because they address human psychology, not market mechanics. His concept of “Mr. Market,” a manic-depressive business partner who offers to buy or sell your shares at wildly different prices from day to day, remains one of the best mental models for understanding stock market volatility. The lesson is simple: the market is there to serve you, not to guide you. That idea is just as useful in 2025 as it was in 1949.
His emphasis on “margin of safety,” buying assets at a meaningful discount to what they’re worth so you have a cushion if your analysis is wrong, is still the foundation of value investing. Every serious investor, from hedge fund managers to index fund advocates, acknowledges that paying less for an asset improves your odds of a good outcome. Graham didn’t invent the concept of buying low, but he formalized why it works and how to think about it systematically.
Graham’s advice on asset allocation also holds up. He recommended keeping between 25% and 75% of your portfolio in bonds, adjusting based on market conditions, with the rest in stocks. The specific ratio matters less than the principle: diversifying across asset classes protects your capital during downturns while still allowing for growth. That idea underpins virtually every modern portfolio strategy.
Where the Book Shows Its Age
Graham’s quantitative methods were designed for a different era. His famous valuation screens relied heavily on metrics like book value (the net worth of a company’s physical assets) and earnings-per-share history. These worked well when the economy was dominated by railroads, manufacturers, and utilities, companies whose value was tied to tangible things like factories, inventory, and real estate.
Today’s most valuable companies derive their worth from intangible assets: intellectual property, brand loyalty, user data, and network effects. A company like Apple would have been dismissed by Graham’s formulas because its book value was low relative to its stock price. The formula couldn’t capture what actually made the business valuable: innovation, an ecosystem of products, and hundreds of millions of loyal customers. Applying Graham’s original screening criteria to software, cloud computing, or platform businesses will consistently flag them as overpriced, even when they’re not.
Graham’s “net-net” strategy, buying companies trading below their net current asset value (essentially paying less than the liquidation value of the business), was a powerful approach in the mid-20th century. But those opportunities have largely vanished. Markets are far more efficient now, with millions of investors and algorithms scanning for undervalued stocks around the clock. The number of companies trading below their liquidation value in developed markets is a tiny fraction of what it once was.
The Value vs. Growth Problem
Graham was the intellectual father of value investing, and the performance record of that style over the past two decades complicates the book’s relevance. Growth stocks have outperformed value stocks in 14 of the last 20 years, according to Morningstar data through the end of 2024. Over that full 20-year stretch, the cumulative return on the U.S. Growth Index was about 785%, roughly double the 388% return of the U.S. Value Index.
This doesn’t mean value investing is permanently broken. Value has led in stretches, including the start of 2025. But the extended dominance of growth stocks, driven by technology companies with high valuations and rapid earnings expansion, means a strict Grahamian approach would have left significant returns on the table over the past decade and a half. Readers who pick up the book expecting a ready-made system for beating the market will be disappointed.
Graham’s Defensive Investor Looks a Lot Like Indexing
One of the book’s most practical sections describes two types of investors: the “enterprising” investor who actively researches and selects stocks, and the “defensive” investor who wants solid returns without the time commitment. Graham’s advice for the defensive investor was to buy a broad basket of large, stable companies in equal amounts and practice dollar-cost averaging, investing a fixed dollar amount at regular intervals regardless of price.
In modern terms, Graham’s defensive investor is essentially an index fund investor. He explicitly said that someone without the time or inclination to do quality research should simply buy the market. Today, that means owning a low-cost total market ETF or an S&P 500 index fund, a strategy that didn’t exist in Graham’s time but aligns perfectly with his logic. If you finish the book and decide active stock-picking isn’t for you, Graham himself would tell you that’s a perfectly intelligent choice.
How to Read It in 2025
The best way to approach “The Intelligent Investor” today is to read the revised edition with commentary by Jason Zweig, a financial journalist who updates each chapter with modern context and examples. Zweig’s notes bridge the gap between Graham’s 1949 market and the one you’re investing in now, flagging where the original advice needs adjustment.
Read it for the principles, not the formulas. The chapters on Mr. Market, margin of safety, the difference between investing and speculating, and the psychology of market fluctuations are genuinely timeless. The chapters with specific stock screens and ratio thresholds are historical artifacts worth understanding but not worth following literally.
If you’re a beginning investor, the book will give you a mental framework that protects you from panic-selling during downturns and chasing hot stocks during bubbles. If you’re more experienced, it will sharpen your thinking about risk and valuation even if you never buy a single “Graham stock.” The reason the book has stayed in print for over 75 years isn’t that its formulas still work. It’s that the emotional and intellectual traps it warns you about haven’t changed at all.