| MR Mend Maintenance Ltd | Construction | 2025 |
| MR R B LLP | | 2025 |
| MRC Business Finance Ltd | Financial services | 2023 |
| MS Engineering (Torbay) Limited | Manufacturing | 2008 |
| Mser Properties Ltd | Real estate | 2026 |
| MTS Rider Training Limited | Education | 2020 |
| Museum Way Limited | Real estate | 2016 |
| MVL Sports Ltd | Arts & recreation | 2025 |
| MWP Direct Ltd | Wholesale & retail | 2025 |
| My Online Learning Experts Ltd | Education | 2022 |
| MYO Wholesale Trading Ltd | Wholesale & retail | 2025 |
| N J Drury Limited | Construction | 2022 |
| Namesakes Global Limited | Wholesale & retail | 2003 |
| Nanny Joan's Cakes Limited | Hospitality | 2019 |
| Nanoscape Limited | Professional & scientific | 2020 |
| Naomi Spencer Estates Limited | Real estate | 2025 |
| NAP Lets Limited | Hospitality | 2020 |
| NAP SW Ltd | Hospitality | 2026 |
| Nathan Yates Limited | Construction | 2013 |
| Natural State of Wellbeing Ltd | Health & social care | 2025 |
| NB Installations (South West) Limited | Construction | 2021 |
| NB Trade Frames ( South West ) Ltd | Manufacturing | 2026 |
| NCL Offshore Ltd | Professional & scientific | 2015 |
| NCT Plumbing & Heating Services Limited | Construction | 2010 |
| Neales Wheels Removals Devon Ltd | Transport & logistics | 2024 |
| Neat Books Limited | Professional & scientific | 2008 |
| NEON87 Ltd | Wholesale & retail | 2018 |
| Netshift CIC | Professional & scientific | 2023 |
| Networkagility Ltd | Information & communication | 2024 |
| Nevaeh Rose Care Services Ltd | Health & social care | 2023 |
| New Beginnings 2014 Limited | Hospitality | 2014 |
| Newbarn Farm Limited | Hospitality | 2018 |
| Newstone Construction (SW) Ltd | Construction | 2006 |
| Next Route Finance Limited | Financial services | 2012 |
| Next Route Limited | Extraterritorial | 2012 |
| NG Rail Locomotive Railway Preservation Limited | Financial services | 2023 |
| NG Rail Operating Limited | Administrative & support | 2023 |
| Nick Ruggles Associates Ltd | Professional & scientific | 2026 |
| Nick Thomas Boatbuilder Limited | Construction | 2025 |
| Nicky Alan Psychic Medium Limited | Administrative & support | 2010 |
| Ninja Cleaners SW Ltd | Administrative & support | 2023 |
| Nissha Medical Technologies Ltd | Manufacturing | 2006 |
| Nita Consultancy Ltd | Administrative & support | 2022 |
| NJA (SW) Ltd | Information & communication | 2019 |
| NJT Maritime Consultants & Services Ltd | Professional & scientific | 2019 |
| NLB Auctions Ltd | Wholesale & retail | 2023 |
| Noble Education Group Limited | Education | 2019 |
| Nomad-Led Ltd | Professional & scientific | 2013 |
| North Devon Support Ltd | Other services | 2026 |
| North Hill Close Management Company Limited | Households | 1984 |
| Northcott Construction Ltd | Construction | 2008 |
| Northern Lapin Ltd | Professional & scientific | 2026 |
| Notoka Ltd | Professional & scientific | 2023 |
| Noved Consulting Ltd | Professional & scientific | 2023 |
| NS Torbay Ltd | Hospitality | 2025 |
| Nursefobs Ltd | Wholesale & retail | 2020 |
| Nutan Retails Ltd | Wholesale & retail | 2024 |
| Nuwave Academy Limited | Education | 2026 |
| Nuwave Clinic Ltd | Professional & scientific | 2022 |
| O&I Property Limited | Real estate | 2025 |
| O'Neill & Holman Limited | Other services | 2016 |
| Oak Park House Management Company Limited | Households | 2006 |
| Oak Tree Garage (Paignton) Ltd | Manufacturing | 2010 |
| Occi Originals Ltd | Manufacturing | 2013 |
| Occombe Barns Management Company Limited | Real estate | 2004 |
| Ocean Healthcare Holdings Limited | Financial services | 2023 |
| Ocean Point Management Company Ltd | Households | 2025 |
| Ocean View Consulting Limited | Professional & scientific | 2015 |
| Oceans Assured Ltd | Other services | 2024 |
| Octane Holding Ltd | Financial services | 2025 |
| Odious Ltd | Arts & recreation | 2021 |
| Office Hotel Ltd | Professional & scientific | 2025 |
| Officepros Ltd | Administrative & support | 2025 |
| Offmetrolley Golf Ltd | Wholesale & retail | 2015 |
| Oldenburg Park Company Limited | Households | 1992 |
| Oldway Court Management Limited | Professional & scientific | 2014 |
| Oldway Gallery & Picture Framers Ltd | Arts & recreation | 2020 |
| Oldway Heights Limited | Health & social care | 2017 |
| Oliver & Bird Limited | Wholesale & retail | 2004 |
| Oliver Brown Dance Academy LLP | | 2022 |
| Oliver Clubb Ltd | Professional & scientific | 2023 |
| Omni Innovations Ltd | Professional & scientific | 2019 |
| Omoksh Udrek Limited | Manufacturing | 2014 |
| ON WAL Limited | Hospitality | 2024 |
| Onecrowd Ltd | Professional & scientific | 2024 |
| Opal Construction SW Ltd | Construction | 2025 |
| Opal Taxis Ltd | Transport & logistics | 2025 |
| Opportunity Plus UK Limited | Education | 2010 |
| Optima Electrical Services Limited | Construction | 2014 |
| Optimum Fire Ltd | Public administration | 2023 |
| Opulent Brew Ltd | Extraterritorial | 2024 |
| Oral Concept Ceramics Limited | Health & social care | 2012 |
| Orangegrove Leisure Limited | Arts & recreation | 2004 |
| Orchard Drilling Services Ltd | Construction | 2012 |
| Orchard Drinks Ltd | Manufacturing | 2022 |
| Orestone Studios Ltd | Information & communication | 2025 |
| Original Media Services Ltd Limited | Wholesale & retail | 2007 |
| Orlano Ltd | Wholesale & retail | 2026 |
| Orsus Construction Consultants Limited | Professional & scientific | 2015 |
| Osney Travel Ltd | Administrative & support | 2023 |