SSL Certificate Market Share

SSL Certificate Market Share
Certificate Authority Market Share (December 2016)
Comodo 53.6%
Symantec 9.1%
GoDaddy 5.5%
Globalsign 2.7%
Identrust 22.0%
Combined smaller CAs 7.1%

Sources

https://ssl.netcraft.com/surveys/analysis/https/2016/Dec/