After 60 years at the helm of Berkshire Hathaway BRK.A, Warren Buffett retired at the end of 2025. The legendary investor’s record speaks for itself: $100 invested in Berkshire in 1965 would have grown to $5.5 million, compared with just $39,000 in the S&P 500. But in his July 2025 research paper, “Buffett’s Intangible Moats,” Kai Wu of Sparkline Capital revealed something surprising about how Buffett achieved these returns—and it challenges the conventional wisdom about his investment approach.
The Myth of the Old-School Value Investor
Most people think of Buffett as a classic value investor in the mold of his mentor, Ben Graham—someone who buys stocks trading below their tangible book value. The data tells a different story.
Wu’s analysis examined Buffett’s top holdings from 1978 to 2024 and found something remarkable: Only 8% of his positions traded below book value. The median price/book ratio was 3.1, and the average was 7.9. Far from being a Graham-style bargain-hunter, Buffett systematically paid premiums for quality businesses.
Consider his Big Three investments:
- Geico (1976): Purchased at 0.44 times book value near bankruptcy, held until he took it private in 1996 at 3.0 times book value.
- Coca-Cola KO (1988): Bought at 4.1 times book value, held through the 1990s even as it reached 22.0 times book.
- Apple AAPL (2016): Initiated at 4.6 times book value, still holding today at over 57.0 times book after a 10-fold return.
These aren’t the moves of someone obsessed with traditional metrics like tangible book value. Instead, they are the investments of someone who recognized a fundamental shift in how value is created in the modern economy.
The Three Eras of Buffett
Wu identified three distinct phases in Buffett’s evolution, corresponding to broader economic transformations:
The Industrial Era (1950s-1970s): Buffett followed Graham’s playbook, buying companies like Geico below liquidation value. The economy was tangible-asset-heavy, so book value served as a reasonable proxy for intrinsic worth.
The Consumer Era (1980s-2000s): As brand-driven businesses like Coca-Cola demonstrated the power of intangible assets, Buffett adapted. In his 1983 shareholder letter, he wrote about his “strong preference for businesses that possess large amounts of enduring Goodwill and that utilize a minimum of tangible assets.”
The Information Era (2010s-2020s): Buffett finally embraced technology with his massive Apple position. As he noted at the 2018 shareholder meeting, the four largest companies by market value “do not need any net tangible assets.”
Wu’s analysis quantified this evolution by decomposing the balance sheets of Buffett’s holdings over time. In 1978, tangible capital formed the foundation of his portfolio companies’ value. By 2024, intangible assets—particularly brand equity, human capital, intellectual property, and network effects—had taken center stage.
The Real Secret: Two Factors, Not Stock-Picking Magic
Using sophisticated factor analysis, Wu deconstructed Buffett’s returns to identify what actually drove his outperformance.
The results challenge the popular conception of Buffett as an inscrutable stock-picking genius. Wu found that 87% of Buffett’s 3% annual outperformance over the S&P 500 index since 1978 can be explained by factor exposures.
The three main contributors to the outperformance were:
- Intangible Value (1.1% per year): Companies with strong brands, intellectual property, human capital, and network effects. (Read Wu’s research paper on intangible value as a factor here.)
- Quality (1.1% per year): Businesses with high profitability and strong fundamentals. (Read AQR’s research paper on the quality factor here.)
- Traditional Value (0.7% per year): Firms with low prices relative to tangible book value. (Read Fama-French’s original paper here.)
After accounting for these factors, Buffett’s residual alpha—his nonreplicable stock-picking skill—drops to just 0.4% per year. In the more recent period since 1995, his alpha even turned a negative 1.9% annually, meaning he actually underperformed what a simple rules-based strategy following these factors would have delivered.
This isn’t a critique of Buffett. It’s a revelation about the power and durability of systematic, factor-based investing. To his credit, Buffett implemented these insights at a massive scale decades before the broader investment community caught on, with most academic research on factors not formally published until the 1990s.
Why Intangible Value and Quality Work Together
Wu explained the conceptual relationship between intangible value and quality elegantly: Both seek companies with wide moats built on intangible assets, but they capture different time horizons.
Quality identifies companies that are profitable today—businesses with established competitive advantages already generating strong returns. Intangible value, on the other hand, finds companies investing heavily in future profitability through research and development, brand building, and other intangible investments.
The research shows this isn’t theoretical. Companies with high intangible value see their profitability increase substantially over the following three to five years as those investments pay off. Together, these factors capture what Buffett has always sought: businesses with durable competitive advantages, whether proven or in development.
Key Takeaways for Investors
1. You Don’t Need Berkshire to Invest Like Buffett
Wu demonstrates that a simple portfolio—50% allocated to the top 20% of stocks by intangible value and 50% to the top 20% by quality—has closely replicated Buffett’s returns since 1978. This approach can be implemented across multiple regions and market caps, expanding beyond Berkshire’s increasingly constrained opportunity set.
2. Intangible Assets Are the New Competitive Moats
In today’s economy, brand equity, intellectual property, human capital, and network effects matter more than factories and machinery. Wu’s framework provides a quantitative method for identifying companies with strong intangible moats—something investors can apply systematically rather than relying on qualitative judgment alone.
3. Traditional Value Investing Needs an Update
Price/book ratios made sense when tangible assets drove value creation. In an asset-light economy dominated by technology and services, this metric is increasingly obsolete—though it still is effective in asset-heavy industries.
4. Scale Creates Challenges Even for the Best Investors
Berkshire has failed to outperform the S&P 500 since 2008—not because Buffett lost his touch, but because deploying an unwieldy $1 trillion in capital effectively is exponentially harder than investing millions. The firm now holds 30% of its assets in cash, unable to find attractive opportunities at the required scale. Individual investors should recognize this as an advantage they have over Buffett. Smaller portfolios have access to a much wider opportunity set.
5. The Principles Are Universal and Timeless
Wu tested the intangible value plus quality approach across US large-cap tech, US small caps, and international equities. The strategy worked consistently well across all regions and market segments from 2010 to 2024, demonstrating that Buffett’s principles transcend his personal “circle of competence” in US large-cap nontech stocks.
6. Factor-Based Approaches Can Democratize Buffett’s Wisdom
Rather than trying to pick the next Apple or Coca-Cola through pure analysis, investors can systematically identify companies with high intangible value and quality scores. This rules-based approach removes the need for Buffett-level insight while capturing the same core principles that drove his success.
The Road Ahead
As Greg Abel takes over at Berkshire, he faces a challenging environment: elevated valuations, a $1 trillion capital base, and a shrinking opportunity set limited largely to US large caps—small caps no longer move the needle. Moreover, even for those stocks with sufficient capacity, Berkshire must enter and exit carefully to avoid adverse market impact.
For individual investors, the message is even clearer. You don’t need to replicate Buffett’s specific holdings or wait for his next move. The factors that drove his success—intangible value and quality—are accessible, quantifiable, and applicable across global markets. By understanding these principles and applying them systematically, investors can capture the essence of Buffett’s philosophy while avoiding the limitations of Berkshire’s massive scale.
Buffett’s most valuable legacy isn’t his stock picks—it’s the framework he developed for identifying durable competitive advantages in an evolving economy. Wu’s research demonstrated that the framework is more relevant and more accessible than ever.
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