Yes and no!

Yes - Given that the mutiple sites that you put on a single domain are all closely niche related.

No - For presentation purpose, one domain for one company is still the best.

If it's a company site, you should put your customers before SEO mate. If it makes sense for the customers that multiple sites are consolidated, then do so. If it doesn't, create a separate domain for each.

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I think no? Why not create a domain name for your company depending on the location? For example you company is YourCompany.com, you can create YourCompany.com.hk for Hong Kong, YourCompany.com.au for Austrailia and same with the others.

seoseo