Spok Holdings, Inc., through its subsidiary, Spok, Inc., provides various communications solutions to healthcare, government, and other enterprises in the United States, Europe, Canada, Australia, Asia, and the Middle East. The company provides one-way messaging, including numeric messaging services, which enable subscribers to receive messages comprising numbers, such as phone numbers; and alphanumeric messages, including numbers and letters that enable subscribers to receive text messages. It also offers two-way messaging services that enable subscribers to send and receive messages to and from other wireless messaging devices, such as pagers, personal digital assistants, and personal computers; and voice mail, personalized greeting, message storage and retrieval, and equipment loss and/or maintenance protection to one-way and two-way messaging subscribers. In addition, the company develops, sells, and supports enterprise-wide systems to automate, centralize, and standardize clinical