Siri Greftegreff Nøstberg is a private shareholder with an estimated portfolio value of NOK 23.8m. Siri Greftegreff Nøstberg holds a stake in 1 company.

Estimated portfolio value

NOK 23.8m

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

Companies Siri Greftegreff Nøstberg owns

Company	Stake	Value (est.)
WATT HOLDING AS	33.3%	NOK 23.8m

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