 ALEXANDRIA, Va.--BUSINESS WIRE--Spok Holdings, Inc. NASDAQ: SPOK, a global leader in healthcare communications, today announced it will release its fourth quarter and full year 2021 operating results before market open on Thursday, February 17, 2022. A conference call will be held on February 17, 2022, at 8:30 a.m. Eastern Time to discuss fourth quarter and full year 2021 results. Telephone Conference Dial-Ins: Participant Guest Toll-Free: 877-407-0890 Participant Guest Internati 