Why Vonage Holdings, 8×8, and RingCentral Plunged in March By Scalper1 | April 11, 2016 0 Comment Scalper1 News Image source Pexels . What The stock of three Voice over Internet Protocol providers fell last month. Shares of Vonage Holdings fell 14.9% in March, according to data from S&P Scalper1 News Scalper1 News Related posts: Why Red Hat, Inc. Gained 14% in March SS&C Technologies Holdings, Inc. (SSNC) Ex-Dividend Date Scheduled for March 03, 2016 Why IBM and Oracle Plunged in 2015 While Microsoft Soared 19% Higher Cogent Communications Holdings, Inc. (CCOI) Ex-Dividend Date Scheduled for March 09, 2015