Citigroup shares jump 6% after Warren Buffett reveals a near $3 billion stake in the struggling bank - CNBC

A filing revealed that Buffett's Berkshire Hathaway added more than 55 million shares to build a stake worth $2.95 billion as of the end of March.

The 91-year-old "Oracle of Omaha" scooped up Citi shares while they have been underperforming the rest of the financial sector in the past 12 months. The stock is down nearly 40% while the Financial … [+990 chars]

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