Image Credit: Christophe Vorlet By Jason Zweig | April 2, 2011 12:01 a.m. ET Say it ain’t so, Warren. Investors were shocked to learn this week that David Sokol, a trusted lieutenant to Berkshire Hathaway Chairman Warren Buffett, had bought nearly $10 million worth of stock in Lubrizol just over a week before he suggested to Mr....
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