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Warren Buffett's Berkshire Hathaway revealed a new stake in troubled insurer UnitedHealth last quarter, according to a regulatory filing, a surprising buy because of the company's current reputation, but perhaps not considering his history of bargain investing.

The Omaha-based conglomerate bought more than 5 million shares in the health care firm for a stake worth about $1.6 billion at the end of June. The stake puts it as the 18th biggest position in the Berkshire portfolio behind Amazon and Constellation Brands, according to VerityData.

Berkshire's equity portfolio is worth about $300 billion, so it is possible that Buffett's two investing lieutenants Todd Combs and Ted Weschler were more responsible for

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