What was basically an after thought for Warren Buffett's Berkshire Hathaway is now making the billionaire investor more than $4 million ahead of Wednesday's open. A regulatory filing shows that Berkshire Hathaway owned 192,666 shares of Kraft Foods Group as of Dec. 31, which was valued at about 0.01% of Berkshire's total holdings of $109.37 billion. With Kraft's stock up $21.87, or 36% in premarket trade, that stake is now worth $4,213.605.42 more than it was on Tuesday. Prior to the news that H.J. Heinz was merging with Kraft, Buffett was down $256,245.78 so far this year on his Kraft investment.
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