Comodo SSL (Now Sectigo)

Comodo CA was one of the world's largest Certificate Authorities before being rebranded as Sectigo in November 2018. The business was sold by Comodo Group to a private equity firm and rebranded to create a separate identity from the Comodo security software products. All infrastructure remained intact — only the brand changed.

Old Comodo Certificates Are Still Valid

Certificates issued under the Comodo CA brand before the rebrand remain valid until their expiry date. If you decode an older certificate and see O: COMODO CA Limited or O: The COMODO Certification Authority in the issuer, that is a pre-rebrand Comodo certificate. It is functionally identical to a Sectigo certificate — same root trust, same OCSP infrastructure.

Comodo Root Certificates Still in Use

The Comodo root certificates were not changed at rebrand time. The following roots are still widely trusted and used as the trust anchor for both old Comodo and current Sectigo certificates:

• COMODO RSA Certification Authority
• AAA Certificate Services
• COMODO ECC Certification Authority

New Certificates Are Issued Under Sectigo

Any certificate issued after the rebrand uses Sectigo intermediates and shows O: Sectigo Limited in the issuer. See the Sectigo guide for details on identifying current Sectigo certificates.