Just caught something interesting about Berkshire Hathaway's transition that's worth thinking through. Greg Abel inherited a $318 billion portfolio from Buffett at the end of last year, and the concentration in this thing is actually pretty wild when you look at the numbers.

So here's what inherited from the Oracle of Omaha: nearly 61% of all invested assets are sitting in just five stocks. Apple alone is 19.5%, followed by American Express at 15.3%, Coca-Cola at 10.1%, Bank of America at 8.2%, and Chevron rounding out the top five at 7.6%. That's a lot of eggs in a few baskets.

What's interesting is which positions are basically untouchable. Buffett labeled eight companies as indefinite holdings, and you can bet those aren't going anywhere under Abel's watch. Coca-Cola and Amex are the real crown jewels here - we're talking about positions held since 1988 and 1991 respectively. The yields on cost are absolutely ridiculous. Coca-Cola is generating something like 63% annual yield relative to Buffett's original cost basis, while Amex is hitting 39%. Why would you even think about selling that?

But here's where it gets interesting. Abel shares Buffett's obsession with value, and that's where things could shift. Apple's not the bargain it was when Buffett started buying in 2016. The P/E has basically tripled since then, sitting around 34 now. Bank of America tells a similar story - Buffett bought the preferred stock back in 2011 when the common stock was trading at a 62% discount to book value. Today it's trading at a 31% premium. Don't be shocked if Abel continues trimming those positions.

Now, Chevron might be a different story. Abel actually ran MidAmerican Energy before it became Berkshire Hathaway Energy, so he knows the energy game inside and out. The integrated model - drilling, pipelines, chemical plants, refineries - that's the kind of hedge against crude weakness that probably appeals to him. Could see energy becoming more foundational under his leadership.

The philosophy won't change though. That's the thing about inheriting a portfolio built on decades of value investing discipline. The principles stick around even when the person holding the reins changes. Abel's going to do his own thing in some areas, but the core DNA of Berkshire stays the same.