If you need a quick way to secure multiple domains on a single SSL certificate, then the Comodo Positive Multi-Domain SSL is the cert for you.
This certificate can secure up to 2500 total domains and is typically issued in mere minutes, once domain ownership is verified. As an entry-level Domain Validated (DV) option, the Sectigo Positive Multi-Domain SSL is an excellent option for start-up ecommerce sites and other small businesses looking for a little boost with regards to encryption and sales.

This organization validated certificate allows your customers to see that your business was verified by one of the most trusted names in internet security. This certificate is recommended to medium sized ecommerce sites and comes with a dynamic site seal.

With this certificate you can cover up to 250 domains with just one certificate. In addition to SAN support, this certificate offers a static site seal and unlimited server licensing.
This multi-domain certificate is an excellent option for small to medium sized companies that want to make managing and provisioning their domains as simple as possible.

This industry staple OV certificate, now powered by DigiCert, is a convenient solution for securing up to 250 domains with one premium certificate, it also has a $1.75M warranty, instant issuance, CertCentral®, and the Norton™ Seal. View Full Product Details

Flexibility is crucial when it comes to managing multiple sites, which is where this Extended Validation (EV) certificate comes in. By offering features such as 256-bit encryption, the green address bar, SAN support (up to 250 additional domains), and the Sectigo Secured Seal, all visitors will be aware of and appreciate the level of protection offered.

This industry staple EV certificate, now powered by DigiCert, is a convenient solution for securing & providing the highest level of brand validation for up to 250 domains with one certificate, it also has a $1.75M warranty, instant issuance, CertCentral®, and the Norton™ Seal. View Full Product Details

A Multi-Domain SSL certificate provides the flexibility to encrypt up to 250 different domains, sub-domains or IPs. You could even secure an entire environment—all on a single SSL certificate. Best of all, you have the option to add, change or delete SANs on the fly, so your protection will always reflect your current needs. DigiCert SSL certificates boast strong cryptographic standards that meet or exceed all industry standards for encryption strength. This Multi-Domain SSL certificate comes backed by a generous $1,000,000 warranty. Best of all, every website you secure with your Multi-Domain SSL certificate will bear your verified organizational details—in your DigiCert Secure Trust Seal, too. This is especially useful for large enterprise companies looking to meet internal security standards. View Full Product Details

The EV Multi-Domain certificate is one of the fastest, most affordable ways to encrypt and authenticate your web presence on a single certificate. You can secure domains, sub-domains- even an entire server environment – all at once. That would be exorbitantly expensive using single domain EV certificates, but it's incredibly affordable with EV Multi-Domain SSL. Best of all, thanks DigiCert's world class validation apparatus, you won't have to wait for a week like you would with other CAs. With DigiCert, validate quickly – and only once – then issue EV certificates instantly for the next 13 months. Backed by a $1,000,000 warranty and the DigiCert Secure Trust Seal – this is a strong, business-authenticated SSL/TLS solution for any website(s). View Full Product Details