Warren Buffett's Berkshire Hathaway is ramping up buying in a secret stock that could be in the banking sector. If Berkshire's latest earnings report is any indication, the new stock could be in the financial sector. That's larger than the $1.213 billion increase in the third quarter, indicating Berkshire accelerated buying in whatever position it's building. Apple , which is the Oracle of Omaha's biggest holding, amounted to a $174.3 billion stake at the end of December, up $55.3 billion from $119 billion in 2022. Berkshire's American Express stake rose to $28.4 billion in December from $22.4 billion in the year-ago period.

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Persons: Warren, Berkshire Hathaway, —, Alex Crippen Organizations: Apple, Omaha's, Chevron, Berkshire's American, Bank of America Locations: Omaha, Berkshire, Chevron