Cartels are illegal
A cartel is an illegal agreement between competitors which restricts competition. Cartels are often difficult to detect because the cartel members have a common interest in keeping the agreement secret.
Help us uncover cartels
The Competition and Consumer Authority relies on information from outsiders to enforce the Danish Competition Act. If you suspect a cartel or other infringements of the competition rules, we would like to hear from you. You can contact us in the following ways.
If you have any suspicions regarding cartels or other violations of the Competition Act, our Investigation and Cartels Division would like to hear from you.
- Contact the Investigation and Cartels Division by phone +45 41 93 94 95, Monday - Friday 9 am – 3 pm
- Write anonymously to the Investigation and Cartels Division through an encrypted connection
Clicking on the link will take you to the Authority's external data processor. Here, you can submit your information and will have the opportunity to engage in two-way communication with us. If you accept the two-way communication with us, you will still be guaranteed complete anonymity, since all communication goes through our external data processor. You can disconnect the two-way communication at any time.
You can also use our postal address:
Danish Competition and Consumer Authority
Carl Jacobsens Vej 35
We need documentation
We always like to have as many details as possible. Among other things, we would like to know the grounds for your suspicion and the source of your information. If you have evidence in the form of e-mails, other correspondence or other relevant documents, we would also like to see them.
Read about cartels and the most common kinds of infringements of the Danish Competition Act.
Cartel agreements and other kinds of agreements which restrict competition between companies are prohibited. Read about the penalties.
Read about how it is possible to completely avoid fines and imprisonment for having participated in a cartel.