Founder and operator of kontaktdatenbank.ch. Writes the articles on this website about company data, public registers and the rules for contacting businesses.
Who is behind kontaktdatenbank.ch
kontaktdatenbank.ch is run by Martin Adamec as a sole trader. Behind the content, the choice of data sources and the replies to requests is a specific person – not an agency. The full provider details are in the legal notice.
The articles on kontaktdatenbank.ch revolve around one question: how do you work with data about businesses 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: give figures with a date and source, say openly what is not known, and do not round in our own favour. How we work is described on the page Data sources and methodology, the current scope on the page Database status.
Articles
B2B marketing in Switzerland: what the UWG allows25 October 2026 – Email, phone, letter: what Art. 3 UWG requires towards businesses, what the asterisk marking means and what an address list does not change.
Buying company addresses in Switzerland: what to check25 October 2026 – Eight checks before you order: source, reference date, asterisk marking, email and the UWG, the UID as key and price per usable record, plus four warning signs.
