Since succeeding Warren Buffett as CEO of Berkshire Hathaway (NYSE: BRKA) (NYSE: BRKB) last January, Greg Abel has made some major changes to Berkshire's stock portfolio. In the two quarters since taking the helm of the Oracle of Omaha's holding company, Abel has both increased stock holdings and jettisoned many positions, including a few held for many decades.
However, Abel hasn't materially decreased Berkshire's positions in Apple, American Express, Alphabet, Bank of America, and Coca-Cola. During Q2 2026, Berkshire trimmed its BofA stake by 5.9%, while increasing its Alphabet position by 45.2%.
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These five blue chip stocks now account for around 60% of its investments in U.S.-listed equities. Yet while this indeed represents high concentration, is that in itself a major risk? Not necessarily.
It's unfair to call Berkshire Hathaway's stock portfolio concentrated under Greg Abel's watch. After all, it was Warren Buffett's penchant for long-term, high-conviction investments that led to such high concentration in the first place.

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