TORONTO (Reuters) - BlackBerry Ltd, which recently concluded a $1 billion convertible debt offering, said it has agreed with its debtholders to extend an option deadline attached to the deal, giving potential investors a chance to buy up to a further $250 million in convertible debt. The struggling smartphone maker last month shelved plans to sell itself and instead opted to raise funds via a $1 billion notes offering led by Fairfax Financial Holdings, its largest shareholder. ...



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