| NS Global Commerce Limited | Wholesale & retail | 2025 |
| NS Heating Ltd | Construction | 2015 |
| NS Probation Ltd | Health & social care | 2019 |
| NS Properties Investment Ltd | Real estate | 2019 |
| Nsangu Limited | Construction | 2018 |
| Nsantos Engineering Limited | Professional & scientific | 2015 |
| Nsas Group Ltd | Health & social care | 2020 |
| NSB Construction Limited | Construction | 2016 |
| NSD Carpentry and Joinery Service Ltd | Construction | 2019 |
| Nsinfinitus Limited | Wholesale & retail | 2021 |
| NSJ Property Developments Ltd | Construction | 2024 |
| NSM & Partners Limited | Other services | 2016 |
| NSM Contractors Ltd | Construction | 2017 |
| Nsnovarise Ltd | Wholesale & retail | 2025 |
| Nspin Group Ltd | Administrative & support | 2019 |
| Nspl Property Ltd | Real estate | 2025 |
| NSR Corporate Ltd | Information & communication | 2025 |
| Nssb Cardiff Ltd | Wholesale & retail | 2017 |
| NSW Accident Repair Centre Limited | Wholesale & retail | 2006 |
| NSW Joinery Limited | Wholesale & retail | 2018 |
| NT Door Controls Limited | Professional & scientific | 1912 |
| NT Investments Limited | Real estate | 2017 |
| Ntaf Ltd | Wholesale & retail | 2021 |
| Ntafig Services Ltd | Administrative & support | 2021 |
| NTB 13 Limited | Other services | 2018 |
| Ntee Ltd | Wholesale & retail | 2026 |
| NTH Degree Performance Ltd | Other services | 2024 |
| Nthsense AI Ltd | Information & communication | 2025 |
| NTL Properties Limited | Real estate | 2018 |
| NTL Youth Film GB Limited | Information & communication | 2019 |
| Ntlj Properties Limited | Construction | 2023 |
| NTM Financial Services Limited | Professional & scientific | 2012 |
| NTM Wealth Management Limited | Professional & scientific | 2021 |
| NTN Property Ltd | Real estate | 2025 |
| Ntownend Ltd | Professional & scientific | 2018 |
| Nts-Fiz Ltd | Transport & logistics | 2026 |
| NTT Foods Ltd | Hospitality | 2019 |
| Nttmedwellbeing Limited | Health & social care | 2019 |
| NTW Productions Limited | Arts & recreation | 2014 |
| NTZ Retail Ltd | Wholesale & retail | 2019 |
| NU AGE Resources Ltd | Wholesale & retail | 2025 |
| NU Asset Capital Ltd | Financial services | 2023 |
| NU Builds and Civils Ltd | Construction | 2019 |
| NU Haven Stays Limited | Hospitality | 2025 |
| NU Health Ltd | Professional & scientific | 2023 |
| NU Property Holdings Ltd | Construction | 2022 |
| NU-E55ENCE Ltd | Wholesale & retail | 2019 |
| Nu-Tronic Ltd | Wholesale & retail | 2025 |
| Nu.Plastique Limited | Manufacturing | 2017 |
| NU2U Ltd | Wholesale & retail | 2020 |
| Nubia Studios Ltd | Wholesale & retail | 2021 |
| Nudawn Enterprises Limited | Hospitality | 2016 |
| Nuderm Skincare Limited | Wholesale & retail | 2014 |
| Nudes London Limited | Other services | 2025 |
| Nuellan Healthcare Services Limited | Health & social care | 2026 |
| Nuels Collections Ltd | Information & communication | 2025 |
| Nugen Displays Ltd | Administrative & support | 2025 |
| Nugenis Financial Planning Limited | Financial services | 2012 |
| Nugent Developments Limited | Construction | 2017 |
| Nugent Lettings Limited | Real estate | 2017 |
| Nugent Property Limited | Real estate | 2017 |
| NUH Financial Limited | Financial services | 2025 |
| Nuje Mithaas Ltd | Manufacturing | 2026 |
| Nuke Computers Limited | Manufacturing | 2019 |
| Nulink Cyber Security Ltd | Information & communication | 2005 |
| Nulinx Education Partnership CIC | Education | 2019 |
| Nulli Secundus Solutions Limited | Professional & scientific | 2014 |
| Numan Operations Limited | Health & social care | 2021 |
| Number 1 Flooring (U.K.) Limited | Wholesale & retail | 2014 |
| Number 1 George Street (Alderley Edge) Limited | Construction | 2020 |
| Number One Deco Ltd | Wholesale & retail | 2017 |
| Number One Knightsbridge Properties Limited | Real estate | 2016 |
| NUMBER16561916 Limited | Construction | 2025 |
| Numberology 0NE Limited | Professional & scientific | 2012 |
| Numbers and Figures Ltd | Professional & scientific | 2025 |
| Numberwise Accounting Co. Ltd | Administrative & support | 2023 |
| Numera Accountancy Ltd | Professional & scientific | 2019 |
| Numero UNO Enterprises Limited | Wholesale & retail | 2022 |
| Numo Accountants Limited | Professional & scientific | 2022 |
| Numviere Construct Ltd | Construction | 2020 |
| Numéro Switzerland Ltd. | Arts & recreation | 2024 |
| Nunes Electrical Ltd | Construction | 2026 |
| Nuni Ltd | Wholesale & retail | 2021 |
| Nunu's Beauty Ltd | Wholesale & retail | 2025 |
| Nuovo Coin Limited | | 1980 |
| NUR Al-Qalam Publications Limited | Information & communication | 2025 |
| NUR Aleman Ltd | Wholesale & retail | 2025 |
| NUR Cafe Limited | Hospitality | 2017 |
| Nurava Group Ltd | Hospitality | 2025 |
| Nurava Ltd | Hospitality | 2026 |
| Nuriyah Ltd | Wholesale & retail | 2025 |
| Nurlan Bazaar Ltd | Wholesale & retail | 2025 |
| Nurse Connect Ltd | Administrative & support | 2019 |
| Nurseries UK Limited | Health & social care | 2002 |
| Nursling Power Limited | Energy | 2016 |
| Nurture Ventures Limited | Professional & scientific | 2003 |
| Nurturing YOU Limited | Administrative & support | 2022 |
| Nuspace Property Services Limited | Construction | 2018 |
| Nusra Limited | Information & communication | 2023 |
| Nusveqa Mart Ltd | Wholesale & retail | 2025 |