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Unless you’ve been living under a rock, you know that Martin Sorrell, the entrepreneur extraordinaire who took a wire basket company and built it into WPP, the largest advertising business in the world, suddenly retired on April 14. His departure was the direct result of an investigation into allegations (which he denies) of personal misconduct and misuse of company assets. These allegations were serious enough to prompt a surprise weekend retirement, but not apparently material enough to disclose the details to shareholders. So much for transparency.