Chrome’s Plan to Distrust Symantec Certificates (2017)
security.googleblog.com
security.googleblog.com
> Additionally, by December 1, 2017, Symantec will transition issuance and operation of publicly-trusted certificates to DigiCert infrastructure.
"...an initial set of reportedly 127 certificates has expanded to include at least 30,000 certificates, issued over a period spanning several years."