Berkshire Hathaway reveals its secret stock, sending shares surging

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Berkshire Hathaway just disclosed that it dumped $1.6 billion into a sinking ship, and Wall Street instantly paid attention. The health insurance giant UnitedHealth, which had lost nearly half its value in 2025, suddenly surged 7% on Thursday after the Securities and Exchange Commission published Berkshire’s 13F filing. The buy included more than 5 million shares, placing UnitedHealth as the 18th largest stock holding in Berkshire’s $300 billion portfolio. That puts it right after Amazon and Con...