| Nuneaton Mobiles Ltd | Wholesale & retail | 2020 |
| Nuneaton MOT and Service Centre Ltd | Other services | 2018 |
| Nuneaton MOT Centre Ltd | Wholesale & retail | 2014 |
| Nuneaton Old Edwardians RFC (Over the Hedge) Ltd | Real estate | 2024 |
| Nuneaton Properties Ltd | Real estate | 2025 |
| Nuneaton Property Services Limited | Construction | 2008 |
| Nuneaton RAW Pet Food Ltd | Wholesale & retail | 2020 |
| Nuneaton Repair Centre Ltd | Other services | 2019 |
| Nuneaton Replacement Panels Limited | Wholesale & retail | 2003 |
| Nuneaton Roof Truss Limited | Manufacturing | 1999 |
| Nuneaton Sameday Couriers Limited | Transport & logistics | 2000 |
| Nuneaton Sameday Limited | Extraterritorial | 2005 |
| Nuneaton Scaffolding Services Limited | Construction | 2017 |
| Nuneaton Self Storage Ltd | Real estate | 2012 |
| Nuneaton Showers Ltd | Construction | 2014 |
| Nuneaton Signs Limited | Manufacturing | 2010 |
| Nuneaton Sports Nutrition Limited | Wholesale & retail | 2016 |
| Nuneaton Steel Stockholders Limited | Professional & scientific | 1998 |
| Nuneaton Supermarket Limited | Wholesale & retail | 2014 |
| Nuneaton Takeaway Ltd | Hospitality | 2026 |
| Nuneaton Town Football Club CIC | Arts & recreation | 2024 |
| Nuneaton Transport Services Ltd | Wholesale & retail | 2022 |
| Nuneaton Tree Surgeons Limited | Agriculture & fishing | 2011 |
| Nuneaton UK Catering Company Ltd | Hospitality | 2023 |
| Nuneaton Visionplus Limited | Administrative & support | 1989 |
| Nuneaton Warehousing & Distribution Services Ltd | Transport & logistics | 2018 |
| Nuneaton Wedding Cars Ltd | Administrative & support | 2022 |
| Nuneaton Women's Multicultural Resource Centre | Health & social care | 2002 |
| NUR Estates Ltd | Professional & scientific | 2021 |
| Nusu Trans Ltd | Transport & logistics | 2025 |
| Nutrifeast Limited | Manufacturing | 2022 |
| Nutripack UK Limited | Manufacturing | 1988 |
| NV Trade Ltd | Wholesale & retail | 2020 |
| Nvxad Ltd | Real estate | 2022 |
| NWS Gases Limited | Wholesale & retail | 2004 |
| NWT Consulting Ltd | Professional & scientific | 2025 |
| NXD GEN Logistics Ltd | Transport & logistics | 2024 |
| NXS Consultancy Ltd | Information & communication | 2014 |
| Nyanza Autoparts Ltd | Wholesale & retail | 2024 |
| Nyra Trading Limited | Wholesale & retail | 2006 |
| Nyrapharma Medical Nutrition Limited | Manufacturing | 2022 |
| O.L.M Surveying Limited | Construction | 2018 |
| O.M.S. Holdings Limited | Administrative & support | 2016 |
| Oakfield Trees and Landscaping Limited | Administrative & support | 2024 |
| Oakfields Peterborough Limited | Households | 1983 |
| Oaktree Court Management (Yaxley) Limited | Households | 2003 |
| Oaktree Geotechnical Limited | Professional & scientific | 2021 |
| Oakwood Cafe Ltd | Hospitality | 2026 |
| Oases Health Care Services Ltd | Health & social care | 2023 |
| Oasis (Peterborough) Management Company Limited | Households | 2010 |
| Oasis Laminate Floors Limited | Construction | 2003 |
| Oaspry Limited | Transport & logistics | 2017 |
| OB Waste Removals Ltd | Water & waste | 2022 |
| Obics Technologies Limited | Information & communication | 2012 |
| Objects Gallery Ltd | Wholesale & retail | 2013 |
| Oblio Ltd | Transport & logistics | 2018 |
| Ocdv Ltd | Construction | 2017 |
| Ocean Blocks and Aggregates Ltd | Mining & quarrying | 2015 |
| Ocean Hair Spa Limited | Real estate | 2003 |
| Octagon Play Limited | Manufacturing | 2025 |
| Octagon Services Ltd | Information & communication | 2018 |
| Odare Innovations Limited | Wholesale & retail | 2020 |
| ODB Limited | Administrative & support | 2024 |
| ODE Link Ltd | Wholesale & retail | 2024 |
| Odedra Properties Ltd | Real estate | 2018 |
| Odyssey MD Ltd | Other services | 2024 |
| Odyssey PLN Ltd | Professional & scientific | 2024 |
| OFF Grid Innovation Ltd | Wholesale & retail | 2024 |
| OFF the Grid OTG Limited | Administrative & support | 2025 |
| Officially Pickled Limited | Manufacturing | 2024 |
| Ofts Limited | Professional & scientific | 2025 |
| Ohpn Ltd | Health & social care | 2023 |
| Okoro Software Services Ltd | Information & communication | 2026 |
| Olcan Ltd | Wholesale & retail | 2020 |
| Olcs (Operator Licence Compliance Support) Ltd | Professional & scientific | 2025 |
| Oldbury Cottage Care Farm CIC | Agriculture & fishing | 2019 |
| Oldbury Cottage Farm Ltd | Agriculture & fishing | 2016 |
| Olive Branch Holdings Limited | Construction | 2016 |
| Oliver House (Freehold) Limited | Real estate | 2015 |
| Oliver James Homes & Son's Limited | Construction | 2026 |
| Oliver Medina Limited | Health & social care | 2023 |
| Olivers Homes Limited | Construction | 2005 |
| Oliveuk Ltd | Manufacturing | 2025 |
| OLM Construction Limited | Construction | 2025 |
| Olner Design Limited | Arts & recreation | 2013 |
| OLUBIZ5 Ltd | Health & social care | 2023 |
| Olympia Properties Ltd | Real estate | 2017 |
| Olympus Security (Europe) Limited | Administrative & support | 2024 |
| Olympus Security (South West) Limited | Professional & scientific | 2024 |
| Olympus Security (UK) Limited | Professional & scientific | 2010 |
| Omerble Garmyan Ltd | Other services | 2023 |
| Omni Healthcare Systems Limited | Health & social care | 2013 |
| Omorfo Properties Ltd | Real estate | 2026 |
| Ompro Limited | Real estate | 2018 |
| One Communication Solutions Ltd | Information & communication | 2010 |
| One Star Transport Ltd | Transport & logistics | 2019 |
| One Stop Bikes Limited | Wholesale & retail | 2015 |
| One Stop Consult Group Ltd | Professional & scientific | 2019 |
| One Stop Consult Ltd | Professional & scientific | 2017 |
| Onegls Ltd | Transport & logistics | 2024 |