BlackBerry Ltd. confirmed Monday that Andrew Stocking has left his post as executive vice-president of BlackBerry Messenger (BBM). His LinkedIn profile shows that he’s held that position since June last year, and has been an employee of BlackBerry and its predecessor, Research In Motion Ltd., since 2000. BlackBerry spokeswoman Kim Geiger said in an emailed statement that Bocking “made the decision to leave BlackBerry. We thank him for his years of leadership and contribution.” It added that John Sims, BlackBerry’s president of global enterprise solution, would take over responsibility for the BBM group. Amid a number of other senior personnel changes in recent months, Sims’ appointment to that position was announced in December.