Sonja Birkeland is a private shareholder. Sonja Birkeland holds a stake in 1 company.

Companies Sonja Birkeland owns

Company	Stake	Value (est.)
BIRA AS	50.0%	–

Source: Biztrac.no · Data from the Brønnøysund Register Centre and the Norwegian Tax Administration · Last updated 02.09.2026.