Former Berkshire Hathaway (BRKa.N)(BRKb.N) executive David Sokol's trading in Lubrizol (LZ.N) shares as he pitched the company to Warren Buffett is a blurring of personal and professional profit-seeking that could attract a hard look from regulators. Sokol presented a steadfast defense on Thursday. He spent more than 30 minutes on CNBC to say he had no inside information, did nothing unlawful or unethical, and his resignation had nothing to do with his trading.
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