Berkshire Hathaway's latest SEC filing revealed that the company has taken a $1.6 billion stake in UnitedHealth Group.

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Warren Buffett's Berkshire Hathaway has injected $1.6 billion into UnitedHealth Group—buying 5 million shares—signalling ...

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Berkshire Hathaway bought around 5 million shares of UnitedHealth last quarter, according to a regulatory filing. The stake was valued at about $1.57 billion.