BUZZ-Valeant Pharma: jumps on news Pershing Square takes 5 pct stake
** Valeant Pharmaceutical up as much as 3.3 pct after Reuters reports Pershing Square taking a 5 pct stake in company
** Ackman's $3.3 bln stake in company makes his firm the company's fifth-largest stakeholder, source tell Reuters
** The news took company's Canadian and New York listings to record highs intra-day, with the latter seeing more than $500 mln worth of shares traded
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