In a fresh 13D, BlackBerry (BBRY +0.9%) co-founder Mike Lazaridis discloses he has entered into an agreement with fellow co-founder Douglas Fregin to "explore the possibility of submitting a potential joint bid" for BlackBerry. Together, Lazaridis and Fregin own an 8% stake.
Last month, the NYT reported Lazaridis had approached P-E firms Blackstone and Carlyle about a possible BlackBerry bid. He has also reportedly talked with Prem Watsa, who wanted Lazaridis to support Fairfax's buyout effort (still in need of considerable financing).
BlackBerry has turned positive in response to Lazaridis' filing.