How We Invest: Our Investment Framework

The Search for Our Investment Edge

"The most important quality for an investor is temperament, not intellect." – Warren Buffett

In our last post, we discussed The Art of Saying "No," which serves as our disqualifying checklist. Starting with what not to invest in was easy for us, but choosing what to invest in is much harder.

To build our "yes" checklist, like many investors before us, we turned to the greatest capital allocator of all time: Warren Buffett. But we quickly discovered that writing investment principles is easy. Putting them into practice is not. After many years of investing, trial and error, and refining our thinking, we arrived at a framework built on two, seemingly contradictory investment philosophies: the disciplined, risk-averse approach of Warren Buffett, and the optimistic, volatility-embracing logic of the Coffee Can framework.

The Disciplined Approach: The Warren Buffett Way

Buffett's investment framework, laid out across decades of shareholder letters, is built around a simple but demanding filter:

• Demonstrated earning power: the business has a proven track record. Future projections are irrelevant; what matters is what the business has already shown it can do.

• Simple business model: Buffett stays within his Circle of Competence. If the business model is difficult to understand, or requires specialized knowledge to evaluate, he passes.

• Fair price: even a great business can be a bad investment at the wrong price. Every purchase needs a margin of safety, a gap between what you pay and what the business is worth, to protect against errors in judgment and unexpected setbacks.

This framework has saved Berkshire Hathaway from countless mistakes. It filters out noise and hype, and it aligns perfectly with Buffett's first rule of investing: never lose money.

It also implies something that runs counter to conventional financial advice: a concentrated portfolio. Not a collection of mediocre positions designed to "hug" the market, but a small number of investments you understand deeply and believe in completely. When a great opportunity arises, this framework suggests investing with conviction. Charlie Munger, Buffett's longtime partner, said: "The idea of diversification, if you're looking for excellence, is totally ridiculous. It doesn't work. It gives you an impossible task." The discipline of this framework is not just about what you buy; it is about not diluting your best investment ideas with your second-best ones.

But its greatest cost is invisible: the compounders it never buys. When your filters demand demonstrated earning power and a margin of safety, you systematically exclude the "rule breakers", the leaders in emerging industries that look overvalued today but become the dominant businesses of tomorrow. Amazon in 1997. Google in 2004. Netflix in 2010. None of them would have passed a strict Buffett screen at the moment they were most worth owning.

If we follow this path alone, our errors will not be in what we buy. The errors will be of omission: investments we did not have the courage to own that became the great compounders of the future.

So we looked for a complementary framework, one that preserves the discipline of ownership while making room for the businesses Buffett's filters would have missed.

The Rule Breaker Approach: The Coffee Can Mindset

There is a story from the 1950s that every long-term investor should know.

An investment manager named Robert Kirby was transferring a recently deceased client's portfolio to his widow. He discovered that the husband, without ever being a formal client, had been quietly copying the firm's buy recommendations for years, with one difference: he never acted on the sell recommendations. He simply bought and held. His portfolio had outperformed his wife's, and a single position in what would become Xerox was worth more than her entire account.

That story gave rise to what is now called Coffee Can Investing, a name drawn from the old practice of storing valuables in a tin can buried in the backyard. You put something in, and you don't touch it for years.

The core idea is simple: buy a slice of ownership in high-quality companies at a reasonable price, and then do nothing. Sit and wait. No trading. No reacting to headlines. No second-guessing entry points. No trimming winners because they have grown too large. The discipline is almost entirely in the not-doing, and that is precisely what makes it so hard. Blaise Pascal wrote many years ago: "All of humanity's problems stem from man's inability to sit quietly in a room alone." He was not writing about investing, but he may as well have been. In a world that rewards busyness, doing nothing feels lazy and irresponsible. Every earnings report, every market correction, every geopolitical event becomes an invitation to act. The Coffee Can framework limits the urge to sell.

What makes this approach powerful is not any particular stock selection formula. It is the behavioral constraint it imposes. Because you commit to not selling, you are forced to select only companies you believe can withstand the test of time. You cannot only chase trends, because you won't be able to exit when the trend runs out. You cannot react to short-term market noise because the methodology does not allow it. The portfolio is designed from the start to endure.

This resonates deeply with how we think at Rhea. Our permanent capital structure is not just a legal or financial arrangement. It is a behavioral one. When you are not managing redemptions, paying fixed dividends, answering to benchmarks, or forced to sell during downturns, you are free to act as an owner rather than a trader. The Coffee Can investor and the permanent capital investor share the same underlying insight: time is the compounding machine, and most investors shorten it unnecessarily.

The only action this approach requires is the option to add to existing positions or new ones. Selling is simply not an option, which clears an enormous amount of mental space. This is not a passive philosophy. It is a demanding one. It requires conviction in our selections, discipline in our behavior, and the patience to let our winners run.

The Common Thread: Permanent Capital

At Rhea, we are building a framework that draws from both of these philosophies without being limited by either.

On the surface, they appear to contradict each other. Buffett demands demonstrated track records and a margin of safety. The Coffee Can mindset asks you to hold through uncertainty, to let winners run in industries that may not yet have a track record worth analyzing. One minimizes risk. The other embraces it. But they share one key idea: think like an owner, not a trader. Both demand that you buy with conviction and resist the urge to sell. Buffett warns against the habit of trading. The Coffee Can strategy is built on the same principle: not selling is where the alpha is generated. Where they diverge is in how they identify what to own. Buffett stays within his Circle of Competence, demanding simplicity and proven performance. The Coffee Can mindset, at its best, accepts that some of the greatest compounders in history would have failed every one of Buffett's filters at precisely the moment they were most worth owning.

At Rhea, we don't believe we have to choose between these two approaches. We invest with both frameworks deliberately. For businesses we understand deeply, cash-flowing, predictable, within our Circle of Competence, we apply Buffett's discipline: proven earning power, simple model, fair price. But we also recognize that the future will produce industries and technologies we cannot yet fully analyze. In those cases, we borrow from the Rule Breaker philosophy popularized by David Gardner: find the leaders in fast-growing industries, invest with conviction, apply the Coffee Can approach of not selling, and let compounding do what it does best.

Together, these two approaches guide us toward the same destination. Whether we are applying rigorous filters (more on these investment filters in future posts) to a business we understand or holding patiently through volatility in one we believe in, the goal is the same: permanent capital. We want to be the permanent home for high-quality assets, letting time do the heavy lifting.

We may not have figured out exactly where our edge lies. But we know it involves patience, humility, and the discipline never to interrupt the magic of compounding.