BRIEF-Ackman says initial Valeant investment was passive, and that was a mistake
May 2 (Reuters) -
* Ackman says initial investment in Valeant was passive, and that was a mistake
* Ackman says if Pearson has made mistakes that caused Valeant's market value to decline, he is paying the consequences of that - CNBC
* Ackman says Buffett has been an important mentor Further company coverage: (Reporting By Caroline Humer)
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