LEESBURG, Va.--(BUSINESS WIRE)--K2M, Inc. (“K2M” or the “Company”), a spinal device company developing innovative solutions for the treatment of complex spinal pathologies, and Welsh, Carson, Anderson & Stowe (“Welsh Carson”), a leading private equity firm, have entered into a transaction in which Welsh Carson will acquire the outstanding stock and become the majority shareholder of K2M, along with longtime K2M investor, Ferrer Freeman & Co., and K2M’s management.