| Nigel Browne Business Mentoring Ltd | Administrative & support | 2020 |
| Nigel Edwards Trading Ltd | Wholesale & retail | 2016 |
| Nightingale Removals and Storage Limited | Transport & logistics | 1997 |
| Nine Planets Ltd | Wholesale & retail | 2024 |
| Ninfield Energy Reserve Limited | Construction | 2019 |
| Ninroot Media Limited | Information & communication | 2021 |
| NIT3 Shift Entertainment Limited | Arts & recreation | 2014 |
| Nittie Meikova Ltd | Wholesale & retail | 2024 |
| NJF Hydraulics Limited | Professional & scientific | 2019 |
| NK Property Rentals Ltd | Real estate | 2024 |
| NO 7 Bloodstock Ltd | Arts & recreation | 2026 |
| NO Repeats Ltd | Administrative & support | 2025 |
| Nock Consulting Limited | Information & communication | 2012 |
| Noor Creative Agency Ltd | Information & communication | 2024 |
| Noorey Clothing Limited | Wholesale & retail | 2025 |
| Norb Transport Ltd | Wholesale & retail | 2015 |
| Norside Motor Services Limited | Wholesale & retail | 2018 |
| North Somerset Citizens Advice Bureau | Other services | 1994 |
| North Somerset Digital Radio Limited | Information & communication | 2025 |
| North Somerset Environment Company Limited | Water & waste | 2020 |
| North Somerset Home Care Services Ltd | Health & social care | 2021 |
| North Somerset Inspire Limited | Information & communication | 2019 |
| North Somerset Local Media Limited | Information & communication | 2024 |
| North Somerset Parent Carers Working Together CIC | Health & social care | 2020 |
| North Somerset Plumbing Limited | Construction | 2014 |
| North Somerset Properties Ltd | Real estate | 2024 |
| North Somerset Property Services Limited | Real estate | 2003 |
| North Somerset Training Community Interest Company | Information & communication | 2011 |
| Northfields (Property Management) Ltd | Households | 2021 |
| Northland Asset Management Ltd | Administrative & support | 2011 |
| Northland Management Ltd | Administrative & support | 2011 |
| Northover Developments Limited | Construction | 2021 |
| Nortons Wood Productions Limited | Manufacturing | 2020 |
| Nova Horizon Web Design Limited | Information & communication | 2025 |
| Nova Nest & Key Ltd | Real estate | 2026 |
| Novakin Creative Ltd | Extraterritorial | 2026 |
| Novat Ltd | Health & social care | 2026 |
| Noventus Innovation Limited | Professional & scientific | 2023 |
| NRG (SW) Ltd | Wholesale & retail | 2022 |
| Nrgwise Ltd | Construction | 2025 |
| NRR Residents Management Company Limited | Households | 2014 |
| NS Mobile Solutions Limited | Information & communication | 2015 |
| NS Roofing and Building Ltd | Construction | 2025 |
| NSR Fresh Ltd | Hospitality | 2024 |
| Number One Fish and Chip Co Ltd | Hospitality | 2021 |
| Number SIX Ellenborough Crescent Management Association Limited(The) | Households | 1984 |
| Nutrafish Ltd | Extraterritorial | 2020 |
| Nuud Snacks Ltd | Wholesale & retail | 2020 |
| NVD Property Solutions Ltd | Real estate | 2022 |
| Nyland View Management Company Limited | Households | 1993 |
| NZT Haulage Ltd | Transport & logistics | 2021 |
| O'Connor Design Services Limited | Professional & scientific | 2020 |
| O'Rahilly Logistic Solutions Limited | Transport & logistics | 2020 |
| O.E.S. Electrical Supplies Limited | Wholesale & retail | 2006 |
| Oak Tree Parks Holdings Limited | Financial services | 2019 |
| Oak Tree Parks Limited | Hospitality | 1972 |
| Oakfield Media Ltd | Other services | 2024 |
| Oakford Holdings Limited | Construction | 2026 |
| Oaklands Clevedon Limited | Households | 1980 |
| Oakley Digital Ltd | Information & communication | 2012 |
| Oakover Guest House Ltd | Hospitality | 2018 |
| Oasis Energy Ltd | Wholesale & retail | 2026 |
| Oasis Foods Station Ltd | Hospitality | 2025 |
| Obsession Design and Build Ltd | Construction | 2021 |
| Obsession Diving & Angling Marine Services Ltd | Arts & recreation | 2015 |
| Ocean Fayre Limited | Administrative & support | 2010 |
| Octopoda Consult Limited | Other services | 2019 |
| Odyssey Blue Capital Ltd | Financial services | 2021 |
| OFC Management Limited | Professional & scientific | 2023 |
| OFF WE Go Logistics Ltd | Transport & logistics | 2023 |
| Offgrid Surveying Ltd | Construction | 2014 |
| Offshore Healthcare Services Ltd | Health & social care | 2024 |
| Old Chapel Wesley House NO. 2 Limited | Households | 2018 |
| Old Dairy Group Limited | Hospitality | 2024 |
| Old Macdonald's Day Nursery and Preschool Ltd | Education | 2022 |
| Old School Driving Ltd | Transport & logistics | 2024 |
| Old Station Close (Cheddar) Management Company Limited | Households | 1996 |
| Oldmixon Business Park Limited | Administrative & support | 2024 |
| Olivers Property Ltd | Real estate | 2020 |
| Omega Fire and Security Ltd | Administrative & support | 2014 |
| Omsco Group Limited | Other services | 2020 |
| ON Call Covid Testing Network Ltd | Professional & scientific | 2020 |
| ON Your Mind Therapy Ltd | Health & social care | 2025 |
| One ARM Bandit Limited | Arts & recreation | 2007 |
| One Blackburn International Limited | Professional & scientific | 2025 |
| One Choice Recruitment Limited | Administrative & support | 2017 |
| One Room Design Limited | Professional & scientific | 2016 |
| One Step Away Ltd | Professional & scientific | 2014 |
| ONI Fire & Security Ltd | Extraterritorial | 2026 |
| Onroute Media Ltd | Professional & scientific | 2025 |
| ONY Mari Ltd | Transport & logistics | 2024 |
| Open Space Groundworks Ltd | Administrative & support | 2020 |
| Openhouse Portsmouth Limited | Real estate | 2018 |
| Opilis Holdings Ltd | Financial services | 2024 |
| Opilis Limited | Real estate | 2023 |
| Oplos Core Ltd | Information & communication | 2023 |
| Opry Drive Ltd | Transport & logistics | 2021 |
| Optima Care Group LLP | | 2023 |
| Orael.One CIC | Education | 2025 |
| Orange Door Property Company Ltd | Real estate | 2016 |