Founder and owner of kontaktyb2b.pl. Author of the articles published here on company data, public registers and the rules for contacting businesses.
Who is behind kontaktyb2b.pl
kontaktyb2b.pl is run by Martin Adamec, a sole trader. The content, the choice of data sources and the replies to enquiries come from a specific person who can be found in a public register – not an agency.
The articles on kontaktyb2b.pl answer one question: how do you work with company data in practice and within the law? They explain where company data comes from, how to check it and where the legal limits of contact lie.
The principle: give figures with a date and source, say openly what is not known and never round in our own favour. Our way of working is described on the Data sources and methodology page, the current scope on the Database status page.
Free Polish company data: what CEIDG, KRS and REGON offer13 October 2026 – The largest free company databases in Poland are run by the state. What you can get from CEIDG, KRS and REGON, through which API – and what is not there.
PKD 2025: Polish industry codes for company lists13 October 2026 – Two classifications in one register: which sections changed letters, which codes changed meaning and how to filter companies until the end of 2026.
