| Nuclear Decontamination Services Ltd | Professional & scientific | 2008 |
| Nuclear Supplies Limited | Manufacturing | 2000 |
| Nucleus Strataview Limited | Information & communication | 2025 |
| Nudge Consulting and Development Limited | Education | 2014 |
| Nuevo Estates Ltd | Real estate | 2025 |
| Nuevo Renovations Ltd | Wholesale & retail | 2022 |
| Nugen Audio Limited | Information & communication | 2011 |
| Nugen Dental Engineering Limited | Manufacturing | 2025 |
| Nugent Smith Limited | Real estate | 2012 |
| Nugget Creative Limited | Professional & scientific | 2014 |
| Nuin Associates Limited | Professional & scientific | 2014 |
| NUK (BFD) Limited | Wholesale & retail | 2018 |
| Nulane HR Limited | Professional & scientific | 2014 |
| Nulla Carbo Ltd | Professional & scientific | 2024 |
| Numba Ltd | Manufacturing | 2023 |
| Number 1 Leeds Road Maintenance Company Limited | Households | 2015 |
| Number Eighteen Investments | Financial services | 2013 |
| Number Fifteen Investments | Financial services | 2013 |
| Number Fourteen Investments | Financial services | 2013 |
| Number Nine Investments | Financial services | 2013 |
| Number Nineteen Investments | Financial services | 2013 |
| Number One Courier Services Ltd | Transport & logistics | 2025 |
| Number One Nutrition Ltd | Manufacturing | 2026 |
| Number Seven Investments | Financial services | 2013 |
| Number SIX Investments | Financial services | 2013 |
| Number TEN Investments | Financial services | 2013 |
| Number Three Ashleigh Road Limited | Households | 1991 |
| Number Train Ltd | Education | 2022 |
| Number Twelve Spring Road Management Limited | Households | 2000 |
| Numberdar Properties Ltd | Real estate | 2021 |
| Numberscraft Limited | Professional & scientific | 2023 |
| Numblr Ltd | Professional & scientific | 2024 |
| Numeric Accountants Limited | Professional & scientific | 2020 |
| Numero UNO Dining Group Ltd | Manufacturing | 2022 |
| Numidia Consulting Ltd | Professional & scientific | 2018 |
| Numiko Limited | Administrative & support | 2000 |
| Numinous Solutions Ltd | Information & communication | 2023 |
| Numinous.Serendipity Ltd | Professional & scientific | 2023 |
| Nunaa Ltd | Hospitality | 2026 |
| Nunu Advanced Technologies Ltd | Information & communication | 2026 |
| Nuoret Ltd | Health & social care | 2019 |
| Nuovagrace Community Home Care Limited | Health & social care | 2026 |
| Nuovo Prestige Ltd | Wholesale & retail | 2019 |
| Nupc Limited | Hospitality | 2026 |
| Nuqo Limited | Wholesale & retail | 2024 |
| NUR Aesthetics Limited | Other services | 2023 |
| Nurily Limited | Wholesale & retail | 2026 |
| Nurion Technologies Ltd | Information & communication | 2025 |
| Nursa Ltd | Other services | 2020 |
| Nursd Limited | Other services | 2021 |
| Nursery Fields (Winterley) Management Company Limited | Households | 2018 |
| Nursery Lane Management Limited | Households | 1994 |
| Nurture & Nature Ltd | Health & social care | 2025 |
| Nurture Childcare Services Ltd | Health & social care | 2012 |
| Nurture CRM Solutions Ltd | Information & communication | 2007 |
| Nurture Healthcare Training Ltd | Education | 2024 |
| Nurture Holdco Limited | Financial services | 2025 |
| Nurture Holdings Ltd | Health & social care | 2024 |
| Nurture Speech and Language Therapy Ltd | Health & social care | 2022 |
| Nurturingcare Solutions Ltd | Health & social care | 2024 |
| Nurvale Limited | Wholesale & retail | 2026 |
| Nusa Swim Ltd | Wholesale & retail | 2021 |
| NUT Free Bakery Limited | Manufacturing | 2006 |
| Nutient Ltd | Information & communication | 2026 |
| Nutra Gummies UK Ltd | Wholesale & retail | 2024 |
| Nutral Solutions Holdings Limited | Financial services | 2026 |
| Nutral Solutions Limited | Professional & scientific | 2021 |
| Nutrapinnacle Ltd | Wholesale & retail | 2025 |
| Nutri Heroes Limited | Information & communication | 2017 |
| Nutri-Genetix Limited | Manufacturing | 2017 |
| Nutrica Ltd | Hospitality | 2020 |
| Nutrimex Ltd | Wholesale & retail | 2024 |
| Nutrinest Consultancy Ltd | Professional & scientific | 2025 |
| Nutrinova Ltd | Professional & scientific | 2019 |
| Nutrition and Diet Solutions Limited | Health & social care | 2011 |
| Nutrition Wellness Centre Limited | Hospitality | 2026 |
| Nutrition.Fitness UK Ltd | Wholesale & retail | 2025 |
| NUTRITION2GO Ltd | Hospitality | 2014 |
| Nutrova Ltd | Wholesale & retail | 2025 |
| Nutsunami Ltd | Information & communication | 2019 |
| Nutter Holdings Ltd | Construction | 2006 |
| Nuttwood Property Group Ltd. | Real estate | 2017 |
| Nuvare Limited | Professional & scientific | 2025 |
| Nuvem Print Limited | Information & communication | 2023 |
| Nuvem Solutions Ltd | Information & communication | 2019 |
| Nuvic Health Ltd | Health & social care | 2025 |
| Nuvic Ltd | Professional & scientific | 2025 |
| Nuvoma Ltd | Wholesale & retail | 2025 |
| Nuwave Swim School Ltd | Arts & recreation | 2023 |
| Nuyu Clinic Limited | Health & social care | 2024 |
| NV Technology and Services Limited | Professional & scientific | 2002 |
| NVH Commercial Ltd | Transport & logistics | 2023 |
| Nvzzn Limited | Information & communication | 2007 |
| NW Accountancy & Tax Service Ltd | Professional & scientific | 2025 |
| NW Architects Limited | Professional & scientific | 2005 |
| NW Electrical Leeds Ltd | Construction | 2025 |
| NW Investments (UK) Ltd | Real estate | 2014 |
| NW Yorkshire Logistics Limited | Transport & logistics | 2023 |
| NWC Realisations Ltd | Wholesale & retail | 1960 |
| Nwfiam Elite Travel Ltd | Administrative & support | 2026 |