Halvor Søren Marstrander is a private shareholder with an estimated portfolio value of NOK 16.1m. Halvor Søren Marstrander holds stakes in 3 companies, and roles in several others.

Estimated portfolio value

NOK 16.1m

The sum of estimated values across all known holdings in Norwegian AS/ASA companies

Companies Halvor Søren Marstrander owns

Company	Stake	Value (est.)
G4 INVEST AS	50.0%	NOK 163,000
ISOLA HOLDING AS	7.5%	NOK 15.9m
LABELI AS	3.2%	–

Roles

Styrets leder

1 selskap

G4 INVEST AS 927316587

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 02.09.2026.