Arnstein Kjellmark is a private shareholder. Arnstein Kjellmark holds stakes in 4 companies.

Companies Arnstein Kjellmark owns

Company	Stake
BETONG RØROS HOLDING AS	25.0%
JOHAN KJELLMARK HOLDING AS	23.8%
AS FÆMUND	0.1%
RØROS SLAKTERI AS	0.0%

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