TORONTO (Reuters) - BlackBerry Ltd co-founder Mike Lazaridis has increased his stake in the struggling smartphone maker and is considering buying the entire company, according to a securities filing on Thursday. Lazaridis, who now owns 8 percent of the company, has engaged Goldman Sachs and Centerview Partners LLC to assist with a strategic review of his stake. He held almost 5.7 percent as of the end of 2012, according to Thomson Reuters data. (Reporting by Alastair Sharp; Editing by Gerald E. McCormick)



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