| Opus Sky AS | Information & communication | 2021 |
| Opus Økonomi AS | Professional & scientific | 2019 |
| Ordbruket AS | Arts & recreation | 2018 |
| Ordning AS | Information & communication | 2018 |
| Orh AS | Construction | 2005 |
| Oriber AS | Professional & scientific | 2017 |
| Origo Arkitektgruppe AS | Professional & scientific | 1987 |
| Orimar AS | | 2017 |
| Ormlia Tomt Sør AS | Real estate | 2025 |
| Oro-Invest AS | Real estate | 2017 |
| Ort 1 Eiendom AS | Real estate | 2025 |
| Ort 1 Holding AS | Real estate | 2022 |
| Orto Holding AS | Health & social care | 2010 |
| Ortopedi Vest AS | Health & social care | 2000 |
| Ortus Holding AS | Professional & scientific | 2018 |
| Os Sentrum Boligutvikling AS | Manufacturing | 2019 |
| Osa AS | Health & social care | 2005 |
| Osa Kapital AS | | 2024 |
| Osadal AS | | 2023 |
| Osberg AS | Arts & recreation | 2013 |
| Oscar Angell Holding AS | | 2024 |
| Oscarsborg Partners AS | Professional & scientific | 2026 |
| Osh Investment AS | | 2025 |
| Oskar Nyland Holding AS | | 2025 |
| Oslo Cityapartments AS | Real estate | 2008 |
| Oslo Salmon Processing AS | Manufacturing | 2025 |
| Oslo XL Estate AS | Real estate | 2009 |
| Oss & HC AS | Financial services | 2022 |
| Ostereidet Senter AS | Real estate | 2009 |
| Ostereidet Senter II AS | Real estate | 2026 |
| Osterøy Senter AS | Real estate | 1998 |
| Osøyro Eiendomsutvikling AS | Real estate | 2022 |
| Othela Holding AS | Financial services | 2010 |
| Ots Åsane AS | Real estate | 2013 |
| Otterskred & Co Advokatfirma AS | Professional & scientific | 2014 |
| Otto Hestness Rederi AS | Transport & logistics | 1999 |
| Ottomans AS | Hospitality | 2026 |
| Oub AS | Health & social care | 2021 |
| Outdoor Bergen Sentrum AS | Wholesale & retail | 2023 |
| Ove Stamneshagen Holding AS | | 2014 |
| Ove Tolleshaug-Glenjen AS | Wholesale & retail | 2017 |
| Ove Øen Blikkenslager & Taktekker AS | Manufacturing | 1983 |
| Overhaus AS | Professional & scientific | 2012 |
| Ovretveit AS | | 2024 |
| Ovum AS | Professional & scientific | 2016 |
| Ovum DATTER1 AS | Professional & scientific | 2023 |
| Oxygen L Frisør AS | Other services | 2024 |
| Oznor AS | Financial services | 2014 |
| Ozsea AS | Education | 2017 |
| P Hamre Transport AS | Transport & logistics | 2003 |
| P Magnussen AS | Real estate | 1971 |
| P&R Eiendom AS | Real estate | 2020 |
| P.Ruud Holding AS | | 2025 |
| Pa Investment AS | Manufacturing | 2011 |
| Paal J Kahrs Arkitekter AS | Professional & scientific | 2025 |
| Paal J Kahrs Arkitekter AS | Professional & scientific | 1990 |
| Paal Vaage Holding AS | Wholesale & retail | 2018 |
| Padden Kaffe AS | Hospitality | 2026 |
| Pagan Studio AS | Professional & scientific | 2024 |
| Pageturner AS | Arts & recreation | 2023 |
| Pahr Consulting AS | Professional & scientific | 2020 |
| Pahr Regnskap & Rådgivning AS | Professional & scientific | 2017 |
| Paint on Pots Bergen AS | Arts & recreation | 2024 |
| Palam AS | Information & communication | 2019 |
| Palestinabutikken I Bergen AS | Wholesale & retail | 2017 |
| Pallas AS | Real estate | 2016 |
| Pallas Eiendom AS | Real estate | 1978 |
| Palmafossen Næring AS | Real estate | 2013 |
| Pam Holding Bergen AS | Wholesale & retail | 2005 |
| Pamadillo Da | Information & communication | 2024 |
| Pan Konsult Bergen AS | Real estate | 2006 |
| Pando Partners AS | Professional & scientific | 2025 |
| Pania AS | Financial services | 2005 |
| Panorama-Art AS | Wholesale & retail | 2021 |
| Paola Design AS | Professional & scientific | 2010 |
| Papavero AS | Professional & scientific | 2019 |
| Papaya Holding AS | Real estate | 2018 |
| Paperclip AS | Professional & scientific | 2016 |
| Papillon Capital AS | Professional & scientific | 2026 |
| Paracon AS | Financial services | 1992 |
| Paradis Boligutvikling AS | Real estate | 2015 |
| Paradis Nautica AS | Professional & scientific | 1994 |
| Paradis Næringseiendom AS | Real estate | 2002 |
| Paradis Næringspark AS | Real estate | 2011 |
| Paradis Utvikling AS | Real estate | 2015 |
| Paragonia AS | Professional & scientific | 2017 |
| Paralia Leilani AS | | 2024 |
| Paraply Forlag AS | Information & communication | 2020 |
| Parito AS | Information & communication | 2015 |
| Park Pluss Hotell AS | Real estate | 2024 |
| Parkering Seniorboliger AS | Real estate | 2025 |
| Parkn Bar & Sing AS | Real estate | 2023 |
| Parkn Bergen AS | Hospitality | 2023 |
| Parkveien 16 AS | Real estate | 2017 |
| Parma Invest AS | Financial services | 2005 |
| Parsel AS | Real estate | 2022 |
| Parsella AS | Real estate | 2012 |
| Part Arkitektur AS | Professional & scientific | 2018 |
| Part Design AS | Professional & scientific | 2018 |
| Part Møbel AS | Professional & scientific | 2026 |