Sivert Mastad is a private shareholder. Sivert Mastad holds a stake in 1 company, and roles in several others.

Companies Sivert Mastad owns

Company	Stake
ROY JOHANSEN BYGGSERVICE AS	50.0%

Roles

Styremedlem

1 selskap

ROY JOHANSEN BYGGSERVICE AS 876006812

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.