DigiCert is one of the world's largest enterprise certificate authorities with ~35% market share, serving 80%+ of the Fortune 100. It offers DV/OV/EV SSL/TLS certificates, code signing, and PKI solutions, known for its powerful CertCentral management platform and API automation.
Sectigo (formerly Comodo CA) is the world's largest commercial certificate authority with over 100 million certificates issued across 150+ countries, offering cost-effective SSL certificates, the SCM management platform, and comprehensive IoT/PKI solutions.
Founded in 1996, GlobalSign is one of the world's longest-running commercial CAs serving 150+ countries. Offers full SSL/TLS certificates, enterprise managed PKI, IoT device identity, and document signing solutions.
Entrust SSL is the SSL/TLS certificate product line of Entrust (founded 1994, Minneapolis MN USA). All certificates are signed via FIPS 140-2 Level 3 nShield HSM, serving 150+ countries as the preferred SSL solution for government and financial institutions.
Founded in 1998, Comodo CA (now operating under the Sectigo brand) is a globally recognized SSL certificate authority known for its PositiveSSL and EssentialSSL product lines, issuing over 50,000 certificates daily with industry-leading affordability.
IdenTrust was founded in 1999, headquartered in Salt Lake City, Utah, USA. It is a globally recognized root certificate trust bridge provider. Its root certificate is pre-installed in 95%+ of browsers and operating systems, providing trust anchors for hundreds of third-party CAs through cross-signature.