BlackBerry 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 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.
The filing said that Lazaridis, who stepped down as co-chief executive and co-chairman of the company in early 2012, made the move along with his fellow co-founder Douglas Fregin.
(Read more: BlackBerry draws interest of more investors: Report)
The pair, who founded the company then known as Research In Motion in 1985, earlier this year started Quantum Valley Investments to support quantum physics and computing breakthroughs.