Verisign SSL used be issued by Verisign Inc, the American Technology company that runs two of the thirty internet root nameservers. Veisign SSL was issued by Verisign Authentication business, which it sold to Symantec in 2010 for approximately 1.28B dollars.
VeriSign SSL Certificates became Symantec SSL certificate after the sale.
Symantec later sold that business to Digicert in 2017.
It operates largest registry in the World for Domains such as .com, .net, .cc, .name, .gov among others.