Spok Holdings, Inc. (Spok), formerly, USA Mobility, Inc., is a holding company. The Company through its wholly-owned subsidiary, Spok, Inc., provides critical communication software solutions for enterprises. The Company is engaged in unified communication business, which includes wireless operations and software operations. The Company markets and distributes its communication services and solutions through a direct sales force and an indirect sales channel. The Company’s wireless operations include one-way paging and advanced two-way paging networks in the United States. The Company offers software solutions for hospital call centers, clinical workflow communication, communication applications, communications infrastructure and public safety.