Vestfoldmuseene IKS is owned by nine municipalities in Vestfold and Vestfold county.
Kåre Pettersen, deputy county mayor of Vestfold, is the leader of Vestfoldmuseene's representation group.
These mayors are a part of the representation group:
- Alf Johan Svele, Holmestrand municipality
- Elin Gran Weggesrud, Sande municipality
- Thorvald Hillestad, Re municipality
- Petter Berg, Tønsberg municipality
- Andreas Muri, Svelvik municipality
- Are Karlsen, Horten municipality
- Rune Høiseth, Larvik municipality
- Bjørn Ole Gleditsch, Sandefjord municipality
The representation group has, in accordance with agreements, meetings twice every year regarding Vestfoldmuseene IMC.
Between Vestfoldmuseene and the owners there are both a Company Agreement, an Ownership Agreement and a Cooperation Agreement (one for every owner including the foundation Vestfold Fylkeskommune) forming the foundation of the ownership.
The company is regulated by the law of inter-municipal companies.