Guillaume Koelsch is a private shareholder. Guillaume Koelsch holds stakes in 3 companies.

Companies Guillaume Koelsch owns

Company	Stake
KOELSCH AS	56.2%
KOELSCH AS	43.8%
MULTICONSULT ASA	0.0%

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