Dag Sigvard Magelssen is a private shareholder. Dag Sigvard Magelssen holds a stake in 1 company.

Companies Dag Sigvard Magelssen owns

Company	Stake
NORSK UNDERHOLDNINGSMEDISINSK INSTITUTT AS	3.7%

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