Warren Buffett has likely seen $8 billion wiped off the value of his financial stocks in 3 days, as SVB's collapse rattles the banking sector

Warren Buffett's Berkshire Hathaway has likely seen around $8 billion wiped off the value of its financial stocks in just three trading days, after Silicon Valley Bank's collapse sparked a firesale in the sector.

The famed investor's company owned about $74 billion of banking, insurance, and financial-services stocks at the end of December, its latest portfolio update shows. Its largest holdings included Bank of America ($33 billion) and American Express ($22 billion).

Bank of America's stock price tumbled 12% over the course of Thursday, Friday, and Monday. As a result, Berkshire's stake in the bank shrunk in value by about $4 billion in three days, assuming it hasn't touched the position this year.

Similarly, American Express stock has slumped 10% over the past three trading days, slashing the value of Berkshire's stake in the credit-card titan by $2.6 billion.

Berkshire's other financial stocks dropped as well, including Ally Financial (-22%), US Bancorp (-20%), Jefferies (-15%), Citigroup (-12%), BNY Mellon (-11%), and Globe Life (-10%). Overall, its 15 financial holdings have shed $8 billion of value in the past three trading days, a Markets Insider analysis shows.