Mikhail Kostousov is a private shareholder. Mikhail Kostousov holds a stake in 1 company.

Companies Mikhail Kostousov owns

Company	Stake	Value (est.)
SUBSEA1 AS	1.0%	–

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