You could theoretically create an asset type called "suppliers", you can add asset types under Configuration\Asset Mapping. You could then use the standard asset fields mixed with asset custom fields to fill in this information. Asset custom fields can be configured under Configuration\Asset Pages and are only visible on asset summary pages when they're filled in.
Alternatively you could use the knowledgebase to store this information. You could create a suppliers category and create an article for each supplier, or one article listing all suppliers. Knowledge base articles can be created and edited under Configuration\Knowledgebase Options.
