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.
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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.