What will Buffett not invest in today? He used to have a tight circle of competence, but if you look at his portfolio today, you'll see financials, energy compa

What will Buffett not invest in today? He used to have a tight circle of competence, but if you look at his portfolio today, you'll see financials, energy companies (of various types), technology, healthcare, industrials, consumer (staples and discretionary), media, telco. And then his guys invest even wider.