Spok Holdings, Inc., through its wholly owned subsidiary Spok, Inc., provides critical communication solutions for enterprises. The Company is focused offering a range of clinical communication and collaboration solutions that include call center applications, clinical alerting and notifications, one-way and advanced two-way wireless messaging services, mobile communications, and public safety solutions. The Company offers voice mail, personalized greetings, message storage and retrieval, and equipment loss and/or maintenance protection to both one-way and two-way messaging subscribers. It also develops, sells and supports enterprise systems for hospitals and other organizations needing to automate, centralize and standardize clinical communications. The Company offers a variety of solutions in both on-premises and software as service delivery models.