A company database is only as trustworthy as the person who builds it. That is why this page tells you who runs the website, where the data comes from, how we work with it and what we deliberately do not do.

Operator

kontaktdatenbank.ch is run by Martin Adamec as a sole trader. All prices are final prices in CHF. The full provider details are in the legal notice.

Data and website are looked after by one person who has worked with public registers for years. So emails are answered by the person who actually prepares the data. We would rather state openly what is missing from the data than promise completeness we cannot prove.

What we offer

  • Swiss company database – 1,005,992 records (as of 4 November 2026): all 796,383 active entities in the commercial register and places from Overture Maps without a match; one-off exports by twenty-two industries, a whole industry from CHF 219, selections by canton, municipality or your own filters on request. See the industries
  • EU and other markets – neighbouring countries, other EU member states and Florida, compiled on request. More on other markets

How the data is created

  1. Basic data. Company name, legal form, UID, registered office and address come from the commercial register, which the Federal Commercial Registry Office publishes as open government data.
  2. Public contact details. Phone, email address and website currently come from the open places data of Overture Maps. The legal notices on company websites are being collected; OpenStreetMap is planned.
  3. Matching and cleaning. We only assign contact details to a record when the name and street, the address and a word of the name, or the website domain match; the UID from the legal notice will be added once the websites are evaluated. We standardise formats and remove duplicates.
  4. Asterisk marking. We do not currently offer a check against the asterisk marking. We deliver phone numbers as “not checked” for matching in a CRM, not for sales calls.

Details and limits are described on the page Data sources and methodology, the current status on the page Database status.

What we do not do

  • We do not buy in old lists. Our database is based on public registers and open data, not resold address lists of unclear origin.
  • We do not supply consumer data. The data is exclusively B2B: companies, self-employed people and institutions.
  • We do not sell email lists for advertising mailings. Under Art. 3 para. 1 let. o UWG, mass advertising by email requires prior consent, which an export does not contain.
  • We do not supply phone numbers for direct marketing. Without a check it is not known which numbers carry an asterisk; the asterisk marking prohibits passing them on for direct marketing (Art. 3 para. 1 let. u UWG).
  • We do not promise complete accuracy. Registers contain errors and contact details become outdated. We state the reference date and coverage and correct reported errors.
  • We do not take over your legal review. As a buyer you are responsible for your own use.

Questions?

Write to info@kontaktdatenbank.ch. The form is on the Contact page, more about the author of the articles on the page Martin Adamec.