Mariann Østreng is a private shareholder. Mariann Østreng holds a stake in 1 company.

Companies Mariann Østreng owns

Company	Stake
AUT RØRLEGGERMESTER JAN-ERIK ØSTRENG AS	34.0%

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