| AS Gaustad Kabelselskap | Information & communication | 1985 |
| AS Geitemyrsveien 7 | Real estate | 1956 |
| AS Gladvollveien 36 | Real estate | 1970 |
| AS Granholmen Stenhuggeri | | 1899 |
| AS Granlund | Financial services | 1957 |
| AS Grefsentorget 4 | Households | 1944 |
| AS Grefsenveien 6 | Households | 1936 |
| AS Grefsenveien 66 | Real estate | 1985 |
| AS Grensen 8 | Real estate | 1912 |
| AS Grev Wedels Plass 4 | Real estate | 1916 |
| AS Grønlandsleret 37 | Real estate | 1936 |
| AS Gustav Vigelands Vei 5 | Households | 1946 |
| AS Gyldenløvesgate 18 | Households | 1929 |
| AS Gyldenløvesgate 19 | Households | 1984 |
| AS Gjetemyrsveien nr 73 | Households | 1939 |
| AS Gårdreform | Administrative & support | 1987 |
| AS H Gabriel Finne & Co Arkitekt Og Konsulentfirma | Real estate | 1967 |
| AS H Kopp & Co | Financial services | 1973 |
| AS Hagelundveien 2 | Households | 1954 |
| AS Hakon | Financial services | 1989 |
| AS Hammergatens Byggeselskap | Households | 1936 |
| AS Hammergt 9 | Households | 1934 |
| AS Hankøsund | Real estate | 1967 |
| AS Hannibalgården | Real estate | 1936 |
| AS Harbitz AS | Information & communication | 2021 |
| AS Havna-Garasjene | Real estate | 1986 |
| AS Hedren Freelance and Consulting International | Hospitality | 2022 |
| AS Hegdehaugens Jernvarehandel | Wholesale & retail | 1956 |
| AS Hegdehaugsveien 17 | Real estate | 1938 |
| AS Helgesensgate 79 | Households | 1952 |
| AS Helgesensgate 82/84 | Households | 1946 |
| AS Herman Foss Gate 1 | Households | 1930 |
| AS Hermar | Financial services | 2017 |
| AS Holding | Transport & logistics | 1956 |
| AS Holenløkken | Real estate | 1946 |
| AS Holenløkken II | Households | 1949 |
| AS Holenløkken III | Real estate | 1950 |
| AS Holmenhavna 3 | Households | 1950 |
| AS Holmenhavna 7 | Households | 1950 |
| AS Holms Hus | Real estate | 1932 |
| AS Holmsborg | Wholesale & retail | 1990 |
| AS Holtegaten 2 B | Households | 1929 |
| AS Hotel Atlantic | Real estate | 1948 |
| AS Hafrsfjordsgate 24 26 | Households | 1930 |
| AS Handelsbygningen | Real estate | 1987 |
| AS Holtegaten 20 | Real estate | 1917 |
| AS Høyers | Wholesale & retail | 1979 |
| AS Høyres Hus | Real estate | 1917 |
| AS Iladalen I | Households | 1933 |
| AS Ilagaten 2 | Real estate | 1952 |
| AS Imov | Information & communication | 2024 |
| AS Impress | Real estate | 1976 |
| AS Incognitogate 24 | Real estate | 1934 |
| AS Incognitogaten 13 | Households | 1950 |
| AS Ingeniør Pål Voss | | 1989 |
| AS Inkognitogaten 31 | Real estate | 1955 |
| AS Insignia | Other services | 1997 |
| AS Intellect | Professional & scientific | 1986 |
| AS Investa | Information & communication | 1954 |
| AS Islandsg 14 | Households | 1935 |
| AS IT | Professional & scientific | 1986 |
| AS Jaco | Transport & logistics | 1991 |
| AS Jacob Aalls Gate 27 | Households | 1922 |
| AS Jacob Aallsgt 55 | Households | 1920 |
| AS Jagvin | Real estate | 1981 |
| AS Jamlo | Transport & logistics | 1953 |
| AS Jens Bjelkesgate 62 | Households | 1942 |
| AS Jerven Industrier | | 2021 |
| AS Jørgen Løvlandsgate 21 | Households | 1923 |
| AS Jørgen Løvlandsgate 23 | Households | 1979 |
| AS K&K Investor | Real estate | 2017 |
| AS Kapitalistbisk | | 2021 |
| AS Karibien | Information & communication | 1985 |
| AS Kastellhagen Byggelag NR 2 | Households | 1986 |
| AS Killingen | Real estate | 1909 |
| AS Kingo Terrasse | Households | 1930 |
| AS Kirkevang | Households | 1922 |
| AS Kirkeveien 131 | Households | 1919 |
| AS Kirkeveien 39 | Households | 1934 |
| AS Kirkeveien 86/88 | Households | 1922 |
| AS Kjøbenhavnsgate 2 | Real estate | 1941 |
| AS Kjøle- & Fryseinstallasjoner | Real estate | 1974 |
| AS Klaveness Chartering | Transport & logistics | 1967 |
| AS Knalstad Invest | | 1989 |
| AS Kongens Gate 16 | Real estate | 1934 |
| AS Kongensgt 4 | Real estate | 1966 |
| AS Kongshaugen Byggeselskap | Real estate | 1965 |
| AS Konowsgate 73 | Real estate | 1932 |
| AS Kontorfunktionærenes Forenings Byggeselskap | Households | 1916 |
| AS Kopperudsvei 2 | Real estate | 1956 |
| AS Kristiania Byggeselskap for Smaaleiligheter | Real estate | 1912 |
| AS Kristiansandsgt 1 | Households | 1932 |
| AS Kvaale & Co | Wholesale & retail | 1990 |
| AS Kirkegaten 30 | Real estate | 1911 |
| AS Kjølberggaten 1 | Households | 1929 |
| AS Konowsgate nr 69 | Households | 1935 |
| AS Lalan | Financial services | 1980 |
| AS Larviksgaten 8 | Households | 1946 |
| AS Lill Karin Bondø Lege Ønh | Health & social care | 2019 |
| AS Lilleaker Sentrum | Real estate | 1964 |