Berkshire Hathaway: Anatomy of the World's Largest Portfolio

More than just stocks

Berkshire Hathaway isn't a classic fund, it's a conglomerate. The 13F filings only show the listed equity portfolio — Berkshire also fully consolidates subsidiaries like GEICO, BNSF Railway, or Berkshire Hathaway Energy. These are not in 13Fs.

Still, the 13F portfolio at ~$300B+ is the largest and most watched in the world.

The structure in four layers

### Layer 1: The core positions

5-6 positions historically make up 70-80% of the portfolio. Currently:

• Apple (~18%, heavily reduced)
• American Express (~14%)
• Bank of America (~10%)
• Coca-Cola (~8%)
• Chevron (~6%)
• Occidental (~5%)

That's concentration at a level that makes most risk managers nervous — and is exactly the recipe for success.

### Layer 2: Strategic stakes

Positions in Japanese trading houses (Itochu, Marubeni, Mitsubishi, Mitsui, Sumitomo) make up a smaller but growing share. Buffett went public with these bets in 2020 and has added since.

### Layer 3: Smaller positions

Dozens of positions under 1% — many of them historical "playgrounds" for Todd Combs and Ted Weschler, Buffett's designated successors.

### Layer 4: Cash & Treasuries

Not in the 13F, but structurally the most important part: Over $325 billion in short-term US Treasuries.

What the structure teaches us

1. Concentration on quality. Buffett buys businesses, not tickers. The core positions are brand monopolies with high returns on capital.

2. Patience as a competitive advantage. Coca-Cola was bought in 1988. American Express held similarly long. The holding period is decades, not quarters.

3. Willingness to be wrong. The IBM investment failed. Buffett admitted it and exited. This intellectual honesty is rare.

The risks

### Key-person risk

Buffett is 95 years old. Charlie Munger died in 2023. The successors (Greg Abel for operations, Combs/Weschler for investments) are in place — but the market will reconsider the Berkshire premium when Buffett goes.

### Concentration risk

If US banks come under pressure, Berkshire is massively exposed. Apple remains the largest position despite the trim.

### Reinvestment risk

The growing cash pile is both a blessing and a curse. It provides optionality, but the longer it waits, the harder it gets to deploy meaningfully.

What retail investors can learn

• Concentration is a prerequisite for outperformance.
• Holding period > stock picking. Those who buy and sell quickly destroy value.
• Cash is a weapon, not a defeat.
• Patient discipline beats brilliant trading signals over decades.