In this overview you can see all companies within this VendorLink environment. You can see companies in multiple VendorLink modules. In Spend, but also in Contracts. In Spend, for example, you can view your spend data at company level, and you can link companies to contracts in Contracts.
If you our Spend module, companies (if present in the supplied spend data) are created automatically. If you do not use Spend, you can manage your companies in this overview.