Janne Siri Thomassen is a private shareholder. Janne Siri Thomassen holds a stake in 1 company, and roles in several others.

Companies Janne Siri Thomassen owns

Company	Stake
MANDAL CASTINGS HOLDING AS	4.8%

Roles

Styremedlem

1 selskap

FORENINGEN FURULUNDENS VENNER 989783610

Active roles recorded in the Register of Business Enterprises / the Central Coordinating Register

Source: Biztrac.no · Data from the Brønnøysund Register Centre and the Norwegian Tax Administration · Last updated 03.10.2026.