<p>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.</p><p>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.</p><p>In a brief statement late on Thursday, BlackBerry said the earlier announced investor option to purchase up to an additional $250 million of convertible debentures, as part of the offering, has now been extended to January 13.</p><p>BlackBerry, which reports quarterly results next Friday, has been in quiet period since the closing of the initial offering.</p><p><a href="http://www.reuters.com/article/2013/12/13/us-blackberry-debt-idUSBRE9BC0I520131213">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.bloomberg.com/news/2013-12-12/blackberry-gives-lenders-more-time-to-decide-on-additional-debt.html">BlackBerry Gives Lenders More Time to Decide on Debt</a> (Bloomberg)</p><p><a href="http://buzz.money.cnn.com/2013/12/10/blackberry-stock-2014/">BlackBerry: Not dead yet! Seriously</a> (CNN)</p><p><a href="http://seekingalpha.com/article/1896581-can-blackberry-be-trusted">Can BlackBerry Be Trusted? [BlackBerry Ltd]</a> (Seeking Alpha)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=dPtdntoWyhwxbXMHxa4lmUqI5HhuM&ned=us">91 additional articles.</a></p>