Another senior executive is leaving Sprint Corp, the U.S. wireless company that has seen several key leaders exit since it was acquired last year by Japans SoftBank Corp (9984.T). Fared Adib, a 12-year veteran of Sprint who was tapped by SoftBank to lead a new initiative last fall, has resigned from the Overland Park, Kansas-based company, according to an internal memo obtained by Reuters. Fared has been serving on assignment as a senior executive with Sprint, SoftBank and Brightstar to explore the possibility of establishing a new buying entity, the memo said. We look forward to hearing more about his plans in the near future. David Owens, an executive in Sprints product development unit, will succeed Adib, according to the memo.