Live feed16:30:26·323dINSIDERFilingvia QuantisnowChief Operating Officer Wallace Michael W sold $184,869 worth of shares (10,000 units at $18.49), decreasing direct ownership by 16% to 51,175 units (SEC Form 4)ByQuantisnow·Wall Street's wire, on your screen.SPOK· Spok Holdings Inc.TelecommunicationsOriginal source