Good morning, I'm working in a small office (3 persons) and I'd like to ask you whether it is ok if I do a list of potential customers (B2B) with names of CEO, Head of department and Mailadresses and so on? Thank you very much in advance.
It depends on the reason you want to make this list. Potentially, yes, you can make this list, you can send them a cold email under legitimate interest (the so-called soft-spam) in order to introduce your company and services, but you don't have to insert a call to action because marketing activities require consent as the legal basis.
Here you can find more information on GDPR extraterritorial effect and on consent.