[CUSIP NO. 67107W 10 0 Page 2 of 6 1. Name of reporting persons: I.R.S. Identification Nos. of above persons (entities only): DNB Asset Management AS 2. Check the appropriate box if a member of a group: ¨ ¨ (a) 3. SEC use only: 4. Citizenship or place of organization: Kingdom of Norway Number of shares beneficially owned by each]