Brian Nichols is the co-founder of Angel Squad, a community where you’ll learn how to angel invest and get a chance to invest as little as $1k into Hustle Fund's top performing early-stage startups

Charlie Munger was born on January 1, 1924, in Omaha, Nebraska, one block from where Warren Buffett would later live. He served as a meteorologist in the US Army Air Corps during World War II, talked his way into Harvard Law without an undergraduate degree, practiced law, built a real estate business, and in 1959 was introduced to Warren Buffett at a dinner party. 

They talked for hours and immediately recognized in each other the same orientation: that business and investing were ultimately about understanding human nature, competitive advantage, and the compounding of good decisions over long time periods. Charlie Munger investments, built across Berkshire Hathaway and the Daily Journal Corporation's portfolio he managed directly, represent the most distilled expression of what he came to call a "latticework of mental models."

The Berkshire Contribution

Munger's most important investment contribution was the shift in Buffett's philosophy from buying mediocre businesses at very cheap prices, the "cigar butt" approach inherited from Benjamin Graham, to buying outstanding businesses at fair prices and holding them for decades. Munger's reframing: instead of "how cheap is this business?", ask "how durable is its competitive advantage?"

That shift produced Apple, See's Candies, Coca-Cola, American Express, and dozens of other investments that generated returns far beyond what the cigar butt approach would have produced. Buffett has been explicit throughout his career that Munger deserves primary credit for this evolution. In Berkshire's first annual letter after Munger's death, Buffett wrote that Berkshire Hathaway could not have been built to its present status without Munger's inspiration, wisdom, and participation.

Munger held approximately 0.3% of Berkshire Hathaway's Class A shares at his death, representing a significant portion of his estimated $2 billion net worth. He also sat on Costco's board from 1997 through 2023, one of its most vocal advocates. His enthusiasm for Costco's membership model, extreme customer loyalty and relentless cost discipline, reflected the same principle he applied everywhere: find the business with the most durable moat and let it compound.

The Daily Journal Portfolio

The Daily Journal Corporation is a publishing and technology company that Munger chaired from 1977 until 2022. Its investment portfolio, which he managed personally, became a kind of separate canvas for his investment thinking outside of Berkshire. As of Q4 2025, the Daily Journal's portfolio consists of four positions: Wells Fargo, Bank of America, Alibaba, and US Bancorp. It has not changed since Munger's death.

That the portfolio remained untouched is itself instructive. The four stocks were Munger's highest-conviction positions, built over years of analysis. Selling them because he was no longer around to defend them would be precisely the kind of impulsive, short-term behavior he spent decades arguing against.

The Alibaba position is the most interesting part of the story. Munger first bought Alibaba for the Daily Journal portfolio in Q1 2021 and quadrupled the position by year-end. When Chinese regulatory actions against Jack Ma sent the stock into a prolonged decline, Munger halved the position rather than selling entirely. He maintained that Alibaba was still a great business. The position has since partially recovered. His willingness to acknowledge an imperfect thesis, reduce the position rather than pretend the problems didn't exist or exit entirely, is the kind of second-order thinking he spent his career advocating.

The Mental Models Framework

Munger's most enduring intellectual contribution was the concept of the "latticework of mental models." He argued that the best thinkers don't organize knowledge by academic discipline. They build a toolkit of models from multiple disciplines, including psychology, mathematics, physics, economics, and history, and apply whichever model is most relevant to the problem at hand. He called the failure to do this "man with a hammer" thinking: if the only tool you have is a hammer, every problem looks like a nail.

The specific models he returned to most often were the psychology of human misjudgment, inversion (solving problems by thinking about what causes failure rather than success), and the compounding function.

Eric Bahn, Hustle Fund GP, has talked about how the best early-stage investors are the ones who have built a genuine toolkit of analytical frameworks rather than relying on a single investing lens. Munger's mental models framework is the most comprehensive description of how to build that toolkit.

Shiyan Koh, Hustle Fund managing partner, has described Munger's most practical insight as the inversion principle: before asking how to make a startup succeed, ask what would cause it to fail, and make sure none of those things are present. That question, applied rigorously, removes more bad investments than any positive screening process.

Angel Squad and the Long-Game Thinking Framework

Charlie Munger's investment career is the most complete available demonstration of what happens when a rigorous, patient, multi-disciplinary thinker applies compound thinking to capital allocation over sixty years. Angel Squad trains investors to develop the same orientation: build a framework before you build a portfolio, apply it consistently across market cycles, and let the compound effect do the work that prediction never can. 

With 2,500 members across 50 countries, the community is the place to develop exactly this kind of intellectual discipline around early-stage investing. Elizabeth Yin, Hustle Fund GP, has said that the investors who improve most consistently are the ones who treat investment analysis as a craft to be developed over years, not a talent to be deployed. Visit hustlefund.vc/squad.

The Takeaway

Charlie Munger's final portfolio was four stocks. His method was built over nine decades of reading, analyzing, and being wrong in ways that forced him to update his models. His most famous quote, "It's better to buy a wonderful company at a fair price than a fair company at a wonderful price," is simple enough to put on a poster and complex enough to take a lifetime to fully understand. The lesson for early-stage investors is not to buy the four stocks. It's to build the framework that tells you which four are worth buying.