Founder and operator of firmdat.nl. Writes the articles on this website about company data, public registers and the rules for contacting businesses.
Who is behind firmdat.nl
firmdat.nl is operated by Martin Adamec as a sole trader. Behind the content, the choice of sources and the answers to requests is a real person, not an agency. The full provider information is on the legal notice page.
The articles on firmdat.nl revolve around one question: how do you work with data about companies in a way that is both lawful and practical? They describe where company data comes from, how to check it and where the legal limits of outreach lie.
The principle: state figures with date and source, say openly what is not known and do not round in our own favour. How we work is on the data sources and methodology page, the status of the database on database status.
The Dutch business register (KVK): which data is public?25 October 2026 – What the Dutch business register (KVK) contains, what is shielded, what the Non-Mailing Indicator does and why the register is not a free address list.
SBI codes: how to define your target group25 October 2026 – How the Dutch Standard Industrial Classification is structured, what changes with SBI 2025 and how to translate a target group into codes.
