Just caught something worth paying attention to in the latest Berkshire Hathaway filing. Warren Buffett officially handed off the CEO role on Dec. 31, and now Greg Abel is managing a $318 billion portfolio. The interesting part? The concentration is pretty wild.

Five stocks make up 61% of everything. We're talking Apple at 19.5%, American Express at 15.3%, Coca-Cola at 10.1%, Bank of America at 8.2%, and Chevron at 7.6%. That's a lot of eggs in a relatively small basket for a portfolio this size.

Here's what caught my eye though. Coca-Cola and Amex are basically untouchable. These are the "indefinite" holdings Warren flagged years back. Coca-Cola's been there since 1988, Amex since 1991. The yield on cost alone tells you why nobody's selling - we're talking 63% annual yield on Coca-Cola and 39% on Amex relative to their original cost basis. That's generational wealth compounding right there.

But Apple and Bank of America? Different story. Apple's P/E has basically tripled since Warren first bought in back in 2016. It's not the bargain it used to be. Bank of America's even more interesting - when Buffett opened that position in 2011, it was trading at a massive discount to book value. Now it's trading at a premium. If I had to guess, Abel's probably going to trim those positions over time. Both guys value a good deal above all else, and these aren't deals anymore.

Chevron's the wildcard. Abel ran MidAmerican Energy before it became Berkshire Hathaway Energy, so he knows the energy space inside and out. The integrated model - drilling, pipelines, refineries, chemicals - actually hedges pretty well against oil price swings. This one might stick around and even grow.

The real story here is the transition philosophy. Abel's bringing his own approach, but the core principle stays the same - value investing, long-term holds, and not overpaying. The portfolio's telling us which bets Warren was most confident about, and which ones Abel might be rethinking. Worth watching how this plays out over the next few quarters.