A company that has addresses in multiple countries could be considered a multi national company. We found two addresses isn't enough, but three addresses or more generally signifies a company is located broadly across multiple regions.

For example here's Optimizely Inc addresses on their contact us page -

We now track Multinational Companies and you can download lists of websites that we consider Multinational.

You can also filter your existing reports by Multinational and we've also added a 'technology spend' to any company that is multinational to push it up the list of more valuable leads.